GLSA 200410-28: rssh: Format string vulnerability

http://security.gentoo.org/

Severity:	high
Title:	rssh: Format string vulnerability
Date:	10/27/2004
Bugs:	#66988
ID:	200410-28

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.

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.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
app-shells/rssh	< 2.2.2	>= 2.2.2	All supported architectures

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.

Workaround

There is no known workaround at this time.

Resolution

All rssh users should upgrade to the latest version:

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

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200410-28.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.