cdrtools: Local root vulnerability in cdrecord if set SUID root
Gentoo Linux Security Advisory
||GLSA 200409-18 / cdrtools
||September 14, 2004
||September 14, 2004: 01
All supported architectures
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.
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
Code Listing 3.1: Workaround
# chmod a-s /usr/bin/cdrecord
All cdrtools users should upgrade to the latest version:
Code Listing 3.2: Resolution
# emerge sync
# emerge -pv ">=app-cdr/cdrtools-2.01_alpha37-r1"
# emerge ">=app-cdr/cdrtools-2.01_alpha37-r1"