CVE-2020-1921 Information

Description

In the crypt function we attempt to null terminate a buffer using the size of the input salt without validating that the offset is within the 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.

CVSS Vector

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

Reference

https://github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca https://hhvm.com/blog/2021/02/25/security-update.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5