rsync: exploitable heap overflow
Gentoo Linux Security Advisory
||GLSA 200312-03 / rsync
||December 4, 2003
||December 4, 2003: 01
All supported architectures
No related gentoo bugreports
rsync contains a heap overflow vulnerability that can be used to execute
rsync is a popular file transfer package used to synchronize the Portage
Rsync version 2.5.6 contains a vulnerability that can be used to run
arbitrary code. The Gentoo infrastructure team has some reasonably good
forensic evidence that this exploit may have been used in combination with
the Linux kernel do_brk() vulnerability (see GLSA 200312-02) to exploit a
rsync.gentoo.org rotation server (see GLSA-200312-01.)
Please see http://lwn.net/Articles/61541/ for the security advisory released
by the rsync development team.
A remote attacker could execute arbitrary code with the permissions of the
There is no known workaround at this time.
To address this vulnerability, all Gentoo users should read GLSA-200312-02
and ensure that all systems are upgraded to a version of the Linux kernel
without the do_brk() vulnerability, and upgrade to version 2.5.7 of rsync:
Code Listing 3.1: Resolution
# emerge sync
# emerge -pv '>=net-misc/rsync-2.5.7'
# emerge '>=net-misc/rsync-2.5.7'
# emerge clean
Review your /etc/rsync/rsyncd.conf configuration file; ensure that the use
chroot="no" command is commented out or removed, or change use chroot="no"
to use chroot="yes". Then, if necessary, restart rsyncd:
Code Listing 3.2: Resolution
# /etc/init.d/rsyncd restart