CVE-2019-3561 Memory corruption in HHVM

Critical 9.8 Published 29 Apr 2019 Updated 4 Aug 2024

Insufficient boundary checks in HHVM's strrpos and strripos functions allow out-of-bounds memory access, 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-2019-3561?

CVE-2019-3561 is a critical memory corruption vulnerability in Facebook HHVM, published on 29 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Insufficient boundary checks for the strrpos and strripos functions allow access to out-of-bounds memory. This affects all supported versions of HHVM (4.0.3, 3.30.4, and 3.27.7 and below).

Weakness: CWE-125, CWE-119

Which versions are affected by CVE-2019-3561?

It affects 1 product.

Products include Facebook Hhvm.

How do I fix CVE-2019-3561?

No fix has been published for CVE-2019-3561 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2019-3561 being exploited?

There is no known exploitation of CVE-2019-3561 in the wild and no public exploit code.

Sources

Also known as GHSA-rhw4-xq2h-gwx6, UBUNTU-CVE-2019-3561.