What’s Vulnerable › Vulnerabilities

CVE-2021-20254

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.

Affected products

How to fix

Upgrade to a fixed version: Samba 4.12.15, 4.13.8, 4.14.4. Check the vendor advisory for mitigations.

References

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