CVE-2020-1897 Use after free in proxygen

Critical 9.8 Published 18 May 2020 Updated 4 Aug 2024

A malicious client can trigger a use-after-free in the proxygen library via specific request error handling sequences, potentially leading to code execution or crashes.

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-2020-1897?

CVE-2020-1897 is a critical use after free vulnerability in Facebook proxygen, published on 18 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A use-after-free is possible due to an error in lifetime management in the request adaptor when a malicious client invokes request error handling in a specific sequence. This issue affects versions of proxygen prior to v2020.05.18.00.

Weakness: CWE-416

Which versions are affected by CVE-2020-1897?

It affects 1 product.

Products include Facebook Proxygen.

How do I fix CVE-2020-1897?

No fix has been published for CVE-2020-1897 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-2020-1897 being exploited?

There is no known exploitation of CVE-2020-1897 in the wild and no public exploit code.

Sources

Also known as GHSA-838g-g793-hh7g.