Heimdal KDC up to 4.8.11/4.9.7/4.10.2 AD DC Mode security check

Summaryinfo

A vulnerability marked as critical has been reported in Heimdal KDC up to 4.8.11/4.9.7/4.10.2. This affects an unknown function of the component AD DC Mode. Performing a manipulation results in security check. This vulnerability is cataloged as CVE-2018-16860. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Heimdal KDC up to 4.8.11/4.9.7/4.10.2. This affects an unknown code of the component AD DC Mode. The manipulation with an unknown input leads to a security check vulnerability. CWE is classifying the issue as CWE-358. The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in samba's Heimdal KDC implementation, versions 4.8.x up to, excluding 4.8.12, 4.9.x up to, excluding 4.9.8 and 4.10.x up to, excluding 4.10.3, when used in AD DC mode. A man in the middle attacker could use this flaw to intercept the request to the KDC and replace the user name (principal) in the request with any desired user name (principal) that exists in the KDC effectively obtaining a ticket for that principal.

The bug was discovered 05/14/2019. The weakness was shared 07/31/2019 as not defined bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2018-16860 since 09/11/2018. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1211 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 78 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176913 (Debian Security Update for heimdal (DSA 4455-1)).

Upgrading to version 4.8.12, 4.9.8 or 4.10.3 eliminates this vulnerability.

The entries VDB-138543, VDB-138573, VDB-138631 and VDB-138665 are related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Heimdal

Name

• KDC

Version

• 4.8.0
• 4.8.1
• 4.8.2
• 4.8.3
• 4.8.4
• 4.8.5
• 4.8.6
• 4.8.7
• 4.8.8
• 4.8.9
• 4.8.10
• 4.8.11
• 4.9.0
• 4.9.1
• 4.9.2
• 4.9.3
• 4.9.4
• 4.9.5
• 4.9.6
• 4.9.7
• 4.10.0
• 4.10.1
• 4.10.2

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
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Entryinfo

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