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CVE-2021-20254
medium
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.
References
https://www.samba.org/samba/security/CVE-2021-20254.html
https://security.netapp.com/advisory/ntap-20210430-0001/
https://security.gentoo.org/glsa/202105-22
https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html