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VU#730793: Heimdal Kerbos vulnerable to remotely triggered NULL pointer dereference
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
A flawed logical condition 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 the International Continence Society for reporting this issue.
This document was written by Kevin Stephens.
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