CVE-2020-1899 Deserialization in HHVM
An attacker can exploit a deserialization flaw in HHVM to access arbitrary memory addresses, potentially leading to code execution or data disclosure.
- 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-2020-1899?
CVE-2020-1899 is a high-severity unsafe deserialization vulnerability in Facebook HHVM, published on 11 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The unserialize() function supported a type code, "S", which was meant to be supported only for APC serialization. This type code allowed arbitrary memory addresses to be accessed as if they were static StringData objects. This issue affected HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0.
Which versions are affected by CVE-2020-1899?
It affects 1 product.
Products include Facebook Hhvm.
How do I fix CVE-2020-1899?
No fix has been published for CVE-2020-1899 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2020-1899 being exploited?
There is no known exploitation of CVE-2020-1899 in the wild and no public exploit code.
Other vulnerabilities in Facebook HHVM
Sources
Also known as GHSA-hqh4-hp5h-w6qj, UBUNTU-CVE-2020-1899.