Vulnerability · Published Mar 10, 2021 · Assigned by facebook
CVE-2020-1917
Critical 9.8
In plain English
A critical-severity heap buffer overflow in HHVM from Facebook. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities).
Official description
xbuf_format_converter, used as part of exif_read_data, was appending a terminating null character to the generated string, but was not using its standard append char function. As a result, if the buffer was full, it would result in an out-of-bounds write. 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.
Affected products (as reported)
Weakness: CWE-122
References
- https://hhvm.com/blog/2021/02/25/security-update.html x_refsource_MISC
- https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca x_refsource_MISC