CVE-2019-3570 Information

Description

Call to the scrypt_enc() function in HHVM can lead to heap corruption by using specifically crafted parameters (N r and p). This happens if the parameters are configurable by an attacker for instance by providing the output of scrypt_enc() in a context where Hack/PHP code would attempt to verify it by re-running scrypt_enc() with the same parameters. This could result in information disclosure memory being overwriten or crashes of the HHVM process. This issue affects versions 4.3.0 4.4.0 4.5.0 4.6.0 4.7.0 4.8.0 versions 3.30.5 and below and all versions in the 4.0 4.1 and 4.2 series.

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/cc331e4349e91706a673e2a09f1f2ea5bbb33815 https://hhvm.com/blog/2019/06/10/hhvm-4.9.0.html

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