Attacker Value
Unknown
(1 user assessed)
Exploitability
Unknown
(1 user assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Network
1

CVE-2021-44142

Disclosure Date: January 31, 2022 •
CVE-2021-44142 CVSS v3 Base Score: 8.8
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

The Samba vfs_fruit module uses extended file attributes (EA, xattr) to provide “…enhanced compatibility with Apple SMB clients and interoperability with a Netatalk 3 AFP fileserver.” Samba versions prior to 4.13.17, 4.14.12 and 4.15.5 with vfs_fruit configured allow out-of-bounds heap read and write via specially crafted extended file attributes. A remote attacker with write access to extended file attributes can execute arbitrary code with the privileges of smbd, typically root.

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1
Ratings
Gives privileged accessObserved in state-sponsored attacks
Technical Analysis

A July 2024 bulletin from multiple U.S. government agencies indicates that North Korean state-sponsored attackers have demonstrated interest in this vulnerability — not immediately clear whether it was exploited outright or used in some other capacity: https://www.cisa.gov/news-events/cybersecurity-advisories/aa24-207a

Not on CISA KEV as of August 7, 2024.

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CVSS V3 Severity and Metrics
Base Score:
8.8 High
Impact Score:
5.9
Exploitability Score:
2.8
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

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Samba 4.13.17
Samba 4.14.12
Samba 4.15.5
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • canonical,
  • debian,
  • fedoraproject,
  • redhat,
  • samba,
  • synology

Products

  • codeready linux builder -,
  • debian linux 10.0,
  • debian linux 11.0,
  • diskstation manager,
  • enterprise linux 7.0,
  • enterprise linux 8.0,
  • enterprise linux desktop 7.0,
  • enterprise linux eus 8.2,
  • enterprise linux eus 8.4,
  • enterprise linux for ibm z systems 7.0,
  • enterprise linux for ibm z systems 8.0,
  • enterprise linux for ibm z systems eus 8.2,
  • enterprise linux for ibm z systems eus 8.4,
  • enterprise linux for power big endian 7.0,
  • enterprise linux for power little endian 7.0,
  • enterprise linux for power little endian 8.0,
  • enterprise linux for power little endian eus 8.2,
  • enterprise linux for power little endian eus 8.4,
  • enterprise linux for scientific computing 7.0,
  • enterprise linux resilient storage 7.0,
  • enterprise linux server 7.0,
  • enterprise linux server 8.1,
  • enterprise linux server aus 8.2,
  • enterprise linux server aus 8.4,
  • enterprise linux server tus 8.2,
  • enterprise linux server tus 8.4,
  • enterprise linux server update services for sap solutions 8.1,
  • enterprise linux server update services for sap solutions 8.2,
  • enterprise linux server update services for sap solutions 8.4,
  • enterprise linux workstation 7.0,
  • fedora 34,
  • fedora 35,
  • gluster storage 3.5,
  • samba,
  • ubuntu linux 14.04,
  • ubuntu linux 16.04,
  • ubuntu linux 18.04,
  • ubuntu linux 20.04,
  • ubuntu linux 21.10,
  • virtualization host 4.0
Technical Analysis