CVE-2019-11929 Information

Description

Insufficient boundary checks when formatting numbers in number_format allows read/write access to out-of-bounds memory potentially leading to remote code execution. This issue affects HHVM versions prior to 3.30.10 all versions between 4.0.0 and 4.8.5 all versions between 4.9.0 and 4.18.2 and versions 4.19.0 4.19.1 4.20.0 4.20.1 4.20.2 4.21.0 4.22.0 4.23.0.

CVSS Vector

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

Reference

https://github.com/facebook/hhvm/commit/dbeb9a56a638e3fdcef8b691c2a2967132dae692 https://hhvm.com/blog/2019/09/25/security-update.html https://www.facebook.com/security/advisories/cve-2019-11929

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8