CVE-2020-1918

HIGH7.5

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

Published Mar 10, 2021

Modified 1 years ago

Details

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.

References

WEB

https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca

WEB

https://hhvm.com/blog/2021/02/25/security-update.html

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2020-1918

CVSS Analysis

CVSS v3.1

7.5

Exploitability

Attack Vector