Articles / Debian: Security update for…

Debian: Security update for rssh

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. Updated packages are available from security.debian.org.

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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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