Joined: 25 Feb 2003
Location: Essen, Germany
|Posted: Tue Sep 14, 2004 9:34 pm Post subject: [ GLSA 200409-18 ] cdrtools: Local root vulnerability in cdr
|Gentoo Linux Security Advisory
Title: cdrtools: Local root vulnerability in cdrecord if set SUID root (GLSA 200409-18)
Date: September 14, 2004
cdrecord, if manually set SUID root, is vulnerable to a local root exploit allowing users to escalate privileges.
The cdrtools package is a set of tools for CD recording, including the popular cdrecord command-line utility.
Vulnerable: <= 2.01_alpha37
Unaffected: >= 2.01_alpha37-r1
Unaffected: >= 2.01_alpha28-r2 < 2.2
Architectures: All supported architectures
Max Vozeler discovered that the cdrecord utility, when set to SUID root, fails to drop root privileges before executing a user-supplied RSH program. By default, Gentoo does not ship the cdrecord utility as SUID root and therefore is not vulnerable. However, many users (and CD-burning front-ends) set this manually after installation.
A local attacker could specify a malicious program using the $RSH environment variable and have it executed by the SUID cdrecord, resulting in root privileges escalation.
As a workaround, you could remove the SUID rights from your cdrecord utility :
|# chmod a-s /usr/bin/cdrecord |
All cdrtools users should upgrade to the latest version:
|# emerge sync
# emerge -pv ">=app-cdr/cdrtools-2.01_alpha37-r1"
# emerge ">=app-cdr/cdrtools-2.01_alpha37-r1"
Last edited by GLSA on Sun May 07, 2006 4:52 pm; edited 1 time in total