CVE-2019-3556 Information

Description

HHVM supports the use of an dmin\ server which accepts administrative requests over HTTP. One of those request handlers dump-pcre-cache can be used to output cached regular expressions from the current execution context into a file. The handler takes a parameter which specifies where on the filesystem to write this data. The parameter is not validated allowing a malicious user to overwrite arbitrary files where the user running HHVM has write access. This issue affects HHVM versions prior to 4.56.2 all versions between 4.57.0 and 4.78.0 as well as 4.79.0 4.80.0 4.81.0 4.82.0 and 4.83.0.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Reference

https://www.facebook.com/security/advisories/cve-2019-3556 https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4 https://hhvm.com/blog/2020/11/12/security-update.html

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.1