CVE-2020-1921

Severity CVSS v4.0:

Pending analysis

Type:

CWE-787 Out-of-bounds Write

Publication date:

10/03/2021

Last modified:

15/03/2021

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.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

7.50

Severity 3.x

HIGH

Vector 2.0

AV:N/AC:L/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0

5.00

Severity 2.0

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:facebook:hhvm::::::::		4.56.3 (excluding)
cpe:2.3:a:facebook:hhvm::::::::	4.57.0 (including)	4.80.2 (excluding)
cpe:2.3:a:facebook:hhvm::::::::	4.81.0 (including)	4.93.2 (excluding)
cpe:2.3:a:facebook:hhvm:4.94.0:::::::*
cpe:2.3:a:facebook:hhvm:4.95.0:::::::*
cpe:2.3:a:facebook:hhvm:4.96.0:::::::*
cpe:2.3:a:facebook:hhvm:4.97.0:::::::*
cpe:2.3:a:facebook:hhvm:4.98.0:::::::*

To consult the complete list of CPE names with products and versions, see this page

CVE-2020-1921

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools