[ GLSA 200405-12 ] CVS heap overflow vulnerability

[GLSA]

Gentoo Linux Security Advisory

Title: CVS heap overflow vulnerability (GLSA 200405-12)
Severity: high
Exploitable: remote
Date: May 20, 2004
Bug(s): #51460
ID: 200405-12

Synopsis

CVS is subject to a heap overflow vulnerability allowing source repository compromise.

Background

CVS (Concurrent Versions System) is an open-source network-transparent version control system. It contains both a client utility and a server.

Affected Packages

Package: dev-util/cvs
Vulnerable: <= 1.11.15
Unaffected: >= 1.11.16
Architectures: All supported architectures


Description

Stefan Esser discovered a heap overflow in the CVS server, which can be triggered by sending malicious "Entry" lines and manipulating the flags related to that Entry. This vulnerability was proven to be exploitable.

Impact

A remote attacker can execute arbitrary code on the CVS server, with the rights of the CVS server. By default, Gentoo uses the "cvs" user to run the CVS server. In particular, this flaw allows a complete compromise of CVS source repositories. If you're not running a server, then you are not vulnerable.

Workaround

There is no known workaround at this time. All users are advised to upgrade to the latest available version of CVS.

Resolution

All users running a CVS server should upgrade to the latest stable version: