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
Upstream
Released (4.14.1,4.13.6,4.12.13)
Ubuntu 21.04 (Hirsute Hippo)
Released (2:4.13.3+dfsg-1ubuntu2.1)
Ubuntu 20.04 LTS (Focal Fossa)
Released (2:4.11.6+dfsg-0ubuntu1.8)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (2:4.7.6+dfsg~ubuntu-0ubuntu2.23)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (2:4.3.11+dfsg-0ubuntu0.16.04.34)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11)