Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Network
0

CVE-2021-20254

Disclosure Date: May 05, 2021 •
CVE-2021-20254 CVSS v3 Base Score: 6.8
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Description

A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity.

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CVSS V3 Severity and Metrics
Base Score:
6.8 Medium
Impact Score:
5.2
Exploitability Score:
1.6
Vector:
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector (AV):
Network
Attack Complexity (AC):
High
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
None

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
samba samba 4.14.1, samba 4.13.6, samba 4.12.13
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • debian,
  • fedoraproject,
  • redhat,
  • samba

Products

  • debian linux 9.0,
  • enterprise linux 7.0,
  • enterprise linux 8.0,
  • fedora 32,
  • fedora 33,
  • samba
Technical Analysis