Summaryinfo

A vulnerability has been found in Heimdal up to 7.2 and classified as critical. This impacts an unknown function of the component Transit Path Validator. This manipulation causes access control. The identification of this vulnerability is CVE-2017-6594. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Heimdal up to 7.2. It has been declared as critical. Affected by this vulnerability is an unknown part of the component Transit Path Validator. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The transit path validation code in Heimdal before 7.3 might allow attackers to bypass the capath policy protection mechanism by leveraging failure to add the previous hop realm to the transit path of issued tickets.

The bug was discovered 03/09/2017. The weakness was shared 08/28/2017 (Website). The advisory is shared at lists.opensuse.org. This vulnerability is known as CVE-2017-6594 since 03/09/2017. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 160 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 102556 (openSUSE Security Update : libheimdal (openSUSE-2017-937) (Orpheus' Lyre)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 170297 (OpenSUSE Security Update for libheimdal (openSUSE-SU-2017:2180-1)).

Upgrading to version 7.3 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (102556). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• Heimdal

Version

• 7.0
• 7.1
• 7.2

License

• open-source

Website

• Product: https://github.com/heimdal/heimdal/

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