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.
3.4	$0-$5k	0.27

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.

Type

• Network Authentication Software

Vendor

• MIT

Name

• Kerberos 5

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VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Denial of service
CWE: CWE-476
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kerberos 5 1.18.5/1.19.3
Patch: github.com

07/30/2021 CVE assigned
08/23/2021 +24 days Advisory disclosed
08/23/2021 +0 days VulDB entry created
08/25/2021 +2 days VulDB last updateVendor: http://www.mit.edu/

Advisory: d775c95af7606a51bf79547a94fa52ddd1cb7f49
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2021-37750 (🔒)

Created: 08/23/2021 12:46
Updated: 08/25/2021 19:32
Changes: (3) source_cve_assigned source_cve_nvd_summary advisory_confirm_url
Complete: 🔍

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