CVE-2020-1918 Information disclosure in HHVM
Attackers can read memory prior to in-memory buffers via negative seeking in data URI file operations, potentially exposing sensitive data.
- 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-2020-1918?
CVE-2020-1918 is a high-severity vulnerability in Facebook HHVM, published on 10 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In-memory file operations (ie: using fopen on a data URI) did not properly restrict negative seeking, allowing for the reading of memory prior to the in-memory buffer. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.
Which versions are affected by CVE-2020-1918?
It affects 1 product.
Products include Facebook Hhvm.
How do I fix CVE-2020-1918?
No fix has been published for CVE-2020-1918 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-1918 being exploited?
There is no known exploitation of CVE-2020-1918 in the wild and no public exploit code.
Other vulnerabilities in Facebook HHVM
Sources
Also known as GHSA-w4h2-wcmm-4gwq, UBUNTU-CVE-2020-1918.