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rssh: Format string vulnerability

Content:

1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200410-28 / rssh
Release Date October 27, 2004
Latest Revision May 22, 2006: 02
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
app-shells/rssh < 2.2.2 >= 2.2.2 All supported architectures

Related bugreports: #66988

Synopsis

rssh is vulnerable to a format string vulnerability that allows arbitrary execution of code with the rights of the connected user, thereby bypassing rssh restrictions.

2.  Impact Information

Background

rssh is a restricted shell, allowing only a few commands like scp or sftp. It is often used as a complement to OpenSSH to provide limited access to users.

Description

Florian Schilhabel from the Gentoo Linux Security Audit Team found a format string vulnerability in rssh syslogging of failed commands.

Impact

Using a malicious command, it may be possible for a remote authenticated user to execute arbitrary code on the target machine with user rights, effectively bypassing any restriction of rssh.

3.  Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All rssh users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-shells/rssh-2.2.2"

4.  References



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Page updated October 27, 2004

Summary: This is a Gentoo Linux Security Advisory

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