CVE-2019-11940 Use after free in Proxygen

Critical 9.8 Published 4 Dec 2019 Updated 4 Aug 2024

A use-after-free vulnerability in Proxygen's HPACK decompression allows attackers to cause undefined behavior, potentially leading to code execution or denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-11940?

CVE-2019-11940 is a critical use after free vulnerability in Facebook Proxygen, published on 4 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.

Weakness: CWE-416

Which versions are affected by CVE-2019-11940?

It affects 1 product.

Products include Facebook Proxygen.

How do I fix CVE-2019-11940?

No fix has been published for CVE-2019-11940 yet. Limit exposure of the affected software until one is available.

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-2019-11940 being exploited?

There is no known exploitation of CVE-2019-11940 in the wild and no public exploit code.

Sources

Also known as GHSA-qp47-5phq-m7xm.