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CVE-2021-20254

Public on 2021-05-05
Modified on 2022-02-10
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.

Severity
Medium
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CVSS v3 Base Score
6.8
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 samba 2022-02-10 21:59 ALAS-2022-1564
Amazon Linux 2 - Core samba 2021-07-01 01:06 ALAS2-2021-1680

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 6.8 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD CVSSv2 4.9 AV:N/AC:M/Au:S/C:P/I:P/A:N
NVD CVSSv3 6.8 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N