Executive Summary

Summary
Title Heimdal Kerberos vulnerable to remotely triggered NULL pointer dereference
Informations
Name VU#730793 First vendor Publication 2022-10-07
Vendor VU-CERT Last vendor Modification 2023-07-13
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Overall CVSS Score 7.5
Base Score 7.5 Environmental Score 7.5
impact SubScore 3.6 Temporal Score 7.5
Exploitabality Sub Score 3.9
 
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact None
Integrity Impact None Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
Calculate full CVSS 2.0 Vectors scores

Detail

Overview

The Heimdal Software Kerberos 5 implementation is vulnerable to a null pointer dereferance. An attacker with network access to an application that depends on the vulnerable code path can cause the application to crash.

Description

CVE-2022-3116 A flawed logical condition in lib/gssapi/spnego/accept_sec_context.c allows a malicious actor to remotely trigger a NULL pointer dereference using a crafted negTokenInit token.

Impact

An attacker can use a specially crafted network packet to cause a vulnerable application to crash.

Solution

The latest version of code in the Heimdal master branch fixes the issue. However, the current stable release 7.7.0 does not include the fix.

Acknowledgements

Thanks to Internet Systems Consortium for reporting the vulnerability.

This document was written by Kevin Stephens.

Original Source

Url : https://kb.cert.org/vuls/id/730793

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-476 NULL Pointer Dereference

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1

Alert History

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Date Informations
2023-07-13 21:22:09
  • Multiple Updates
2023-01-12 21:22:05
  • Multiple Updates
2022-12-20 00:22:04
  • Multiple Updates
2022-11-09 21:22:03
  • Multiple Updates
2022-10-08 00:22:00
  • First insertion