2021-37750 | MIT Kerberos 5 Key Distribution Center do_tgs_req.c null pointer dereference
|CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
|Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
|CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
A vulnerability was found in MIT Kerberos 5 up to 1.18.4/1.19.2 (Network Authentication Software) and classified as problematic. This issue affects an unknown code of the file kdc/do_tgs_req.c of the component Key Distribution Center Handler. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-476. Impacted is availability. The summary by CVE is:
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.
The weakness was presented 08/23/2021 as d775c95af7606a51bf79547a94fa52ddd1cb7f49. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2021-37750 since 07/30/2021. The attack needs to be initiated within the local network. A simple authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.
Upgrading to version 1.18.5 or 1.19.3 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.
VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4
Status: Not defined
0-Day Time: 🔒
Created: 08/23/2021 12:46
Updated: 08/25/2021 19:32
Changes: (3) source_cve_assigned source_cve_nvd_summary advisory_confirm_url
Check our Alexa App!