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CVE-2021-20254

Published: 29 April 2021

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.

Priority

Medium

CVSS 3 base score: 6.8

Status

Package Release Status
samba
Launchpad, Ubuntu, Debian
bionic
Released (2:4.7.6+dfsg~ubuntu-0ubuntu2.23)
focal
Released (2:4.11.6+dfsg-0ubuntu1.8)
groovy
Released (2:4.12.5+dfsg-3ubuntu4.3)
hirsute
Released (2:4.13.3+dfsg-1ubuntu2.1)
precise Ignored
(end of ESM support, was needs-triage)
trusty
Released (2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11)
upstream
Released (4.14.1,4.13.6,4.12.13)
xenial
Released (2:4.3.11+dfsg-0ubuntu0.16.04.34)