CVE-2021-3738

Common vulnerabilities & exposures (CVE)

CVE database CVE database blogpost Release & EoL database

Published at: - 03-03-2022 12:15

Last modified: - 10-03-2022 03:59

Total changes: - 3

Description

In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections via a mechanism called 'association groups'. 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 'struct session_info'. 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.

Common Vulnerability Scoring System (CVSS)

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

Low

Attack complexity

Network

Attack vector

High

Availability

High

Confidentiality

High

Integrity

Low

Privileges required

Unchanged

Scope

None

User interaction

8.8

Base score

2.8

5.9

Exploitability score

Impact score

Verification logic

vendor=samba AND product=samba AND versionStartIncluding=4.0.0 AND versionEndExcluding=4.13.14

vendor=samba AND product=samba AND versionStartIncluding=4.14.0 AND versionEndExcluding=4.14.10

vendor=samba AND product=samba AND versionStartIncluding=4.15.0 AND versionEndExcluding=4.15.2

Reference

Keywords

CVE-2021-3738

Common vulnerabilities & exposures (CVE)

Description

Common Vulnerability Scoring System (CVSS)

Verification logic

Reference

NVD

CVE-2021-3738

CVE

Common vulnerabilities & exposures

CVSS

Common vulnerability scoring system

Security

Vulnerabilities

Exposures