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FreeBSD: VID-6F33D38B-AA18-11EB-B3F1-005056A311D1 (CVE-2021-20254): samba -- negative idmap cache entries vulnerability

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FreeBSD: VID-6F33D38B-AA18-11EB-B3F1-005056A311D1 (CVE-2021-20254): samba -- negative idmap cache entries vulnerability

Severity
5
CVSS
(AV:N/AC:M/Au:S/C:P/I:P/A:N)
Published
04/29/2021
Created
11/08/2022
Added
11/04/2022
Modified
11/04/2022

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.

Solution(s)

  • freebsd-upgrade-package-samba412
  • freebsd-upgrade-package-samba413
  • freebsd-upgrade-package-samba414

References

  • CVE-2021-20254
  • USN-4930-1
  • USN-4931-1

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