CVE-2021-3738

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

02/03/2022

Last modified:

17/09/2023

Description

In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections via a mechanism called &#39;association groups&#39;. These handles can reference connections to our sam.ldb database. However while the database was correctly shared, the user credentials state was only pointed at, and when one connection within that association group ended, the database would be left pointing at an invalid &#39;struct session_info&#39;. The most likely outcome here is a crash, but it is possible that the use-after-free could instead allow different user state to be pointed at and this might allow more privileged access.

Impact

Vector 3.x

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

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Base Score 3.x

8.80

Severity 3.x

HIGH

Vector 2.0

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

Base Score: 6.50 MEDIUM
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): Single
Confidentiality (C): Physical
Integrity (I): Physical
Availability (A): Physical

Base Score 2.0

6.50

Severity 2.0

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:samba:samba::::::::	4.0.0 (including)	4.13.14 (excluding)
cpe:2.3:a:samba:samba::::::::	4.14.0 (including)	4.14.10 (excluding)
cpe:2.3:a:samba:samba::::::::	4.15.0 (including)	4.15.2 (excluding)

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

CVE-2021-3738

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools