CVE-2015-6834 Use after free in n/a

Critical 9.8 Published 16 May 2016 Updated 6 Aug 2024

Remote attackers can execute arbitrary code via use-after-free flaws in PHP's unserialization of Serializable, SplObjectStorage, and SplDoublyLinkedList.

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

What is CVE-2015-6834?

CVE-2015-6834 is a critical use after free vulnerability in Php Php, published on 16 May 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Multiple use-after-free vulnerabilities in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 allow remote attackers to execute arbitrary code via vectors related to (1) the Serializable interface, (2) the SplObjectStorage class, and (3) the SplDoublyLinkedList class, which are mishandled during unserialization.

Which versions are affected by CVE-2015-6834?

It affects 1 product.

Products include Php Php.

How do I fix CVE-2015-6834?

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-2015-6834 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2015-6834 exists.

Public exploit code: 2 Exploit-DB entries.

All Php Php vulnerabilities

Sources

Also known as GHSA-6m7q-7r8q-jg24, UBUNTU-CVE-2015-6834.