Joined: 12 May 2004
|Posted: Thu Apr 17, 2008 12:26 pm Post subject: [ GLSA 200804-16 ] rsync: Execution of arbitrary code
|Gentoo Linux Security Advisory
Title: rsync: Execution of arbitrary code (GLSA 200804-16)
Date: April 17, 2008
A buffer overflow in rsync might lead to the remote execution of arbitrary code when extended attributes are being used.
rsync is a file transfer program to keep remote directories synchronized.
Vulnerable: < 2.6.9-r6
Unaffected: >= 2.6.9-r6
Architectures: All supported architectures
Sebastian Krahmer of SUSE reported an integer overflow in the expand_item_list() function in the file util.c which might lead to a heap-based buffer overflow when extended attribute (xattr) support is enabled.
A remote attacker could send a file containing specially crafted extended attributes to an rsync deamon, or entice a user to sync from an rsync server containing specially crafted files, possibly leading to the execution of arbitrary code. Please note that extended attributes are only enabled when USE="acl" is enabled, which is the default setting.
Disable extended attributes in the rsync daemon by setting " refuse options = xattrs " in the file "/etc/rsyncd.conf" (or append "xattrs" to an existing "refuse" statement). When synchronizing to a server, do not provide the "-X" parameter to rsync. You can also disable the "acl" USE flag for rsync and recompile the package.
All rsync users should upgrade to the latest version:
|# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/rsync-2.6.9-r6"
Last edited by GLSA on Tue Jul 07, 2009 4:18 am; edited 2 times in total