CVE-2020-1918 Information

Description

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.

CVSS Vector

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

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

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5