CVE-2018-6836 Use after free in n/a

Critical 9.8 Published 8 Feb 2018 Updated 5 Aug 2024

Remote attackers can crash Wireshark by triggering a free operation on uninitialized memory in the netmon file parser.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2018-6836?

CVE-2018-6836 is a critical use after free vulnerability in Wireshark Wireshark, published on 8 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a free operation on an uninitialized memory address, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact.

Weakness: CWE-763

Which versions are affected by CVE-2018-6836?

It affects 1 product.

Products include Wireshark Wireshark.

How do I fix CVE-2018-6836?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2018-6836 being exploited?

There is no known exploitation of CVE-2018-6836 in the wild and no public exploit code.

All Wireshark Wireshark vulnerabilities

Sources

Also known as GHSA-79gq-68m6-v3vg, UBUNTU-CVE-2018-6836.