Cross-realm trust vulnerability in Heimdal — GLSA 200404-09

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

Affected packages

Package 	app-crypt/heimdal on all architectures
Affected versions 	<= 0.6.0
Unaffected versions 	>= 0.6.1

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.

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:

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

References

    CVE