Cross-realm trust vulnerability in Heimdal

Security Team Contact Address

Updated April 09, 2004

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200404-09 / heimdal
Release Date	April 09, 2004
Latest Revision	April 09, 2004: 01
Impact	normal
Exploitable	local

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-crypt/heimdal	<= 0.6.0	>= 0.6.1	All supported architectures

Related bugreports: #46590

Synopsis

Heimdal contains cross-realm vulnerability allowing someone with control over a realm to impersonate anyone in the cross-realm trust path.

2. Impact Information

Background

Heimdal is a free implementation of Kerberos 5.

Description

Heimdal does not properly perform certain consistency checks for cross-realm requests, which allows remote attackers with control of a realm to impersonate others in the cross-realm trust path.

Impact

Remote attackers with control of a realm may be able to impersonate other users in the cross-realm trust path.

3. Resolution Information

Workaround

A workaround is not currently known for this issue. All users are advised to upgrade to the latest version of the affected package.

Resolution

Heimdal users should upgrade to version 0.6.1 or later:

Code Listing 3.1: Resolution

# emerge sync

# emerge -pv ">=app-crypt/heimdal-0.6.1"
# emerge ">=app-crypt/heimdal-0.6.1"

4. References