what you don't know can hurt you

Debian Security Advisory 2578-1

Debian Security Advisory 2578-1
Posted Nov 28, 2012
Authored by Debian | Site debian.org

Debian Linux Security Advisory 2578-1 - James Clawson discovered that rssh, a restricted shell for OpenSSH to be used with scp/sftp, rdist and cvs, was not correctly filtering command line options. This could be used to force the execution of a remote script and thus allow arbitrary command execution.

tags | advisory, remote, arbitrary, shell
systems | linux, debian
advisories | CVE-2012-2251, CVE-2012-2252
MD5 | 854d8b470b290c64efdcc9e44d21dca1

Debian Security Advisory 2578-1

Change Mirror Download
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- -------------------------------------------------------------------------
Debian Security Advisory DSA-2578-1 security@debian.org
http://www.debian.org/security/ Yves-Alexis Perez
November 28, 2012 http://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : rssh
Vulnerability : insufficient filtering of rsync command line
Problem type : remote
Debian-specific: no
CVE ID : CVE-2012-2251 CVE-2012-2252
Debian Bug :

James Clawson discovered that rssh, a restricted shell for OpenSSH to be used
with scp/sftp, rdist and cvs, was not correctly filtering command line options.
This could be used to force the execution of a remote script and thus allow
arbitrary command execution. Two CVE were assigned:

CVE-2012-2251
Incorrect filtering of command line when using rsync protocol. It was
for example possible to pass dangerous options after a "--" switch. The rsync
protocol support has been added in a Debian (and Fedora/Red Hat) specific
patch, so this vulnerability doesn't affect upstream.

CVE-2012-2251
Incorrect filtering of the "--rsh" option: the filter preventing usage of the
"--rsh=" option would not prevent passing "--rsh". This vulnerability affects
upstream code.

For the stable distribution (squeeze), this problem has been fixed in
version 2.3.2-13squeeze2.

For the testing distribution (wheezy), this problem has been fixed in
version 2.3.3-6.

For the unstable distribution (sid), this problem has been fixed in
version 2.3.3-6.

We recommend that you upgrade your rssh packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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