medium6.8
CVE-2021-20254
A flaw was found in samba.
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Samba | Samba | from 3.6.0 before 4.12.15 from 4.13.0 before 4.13.8 from 4.14.0 before 4.14.4 |
| Fedoraproject | Fedora | Versions 32, 33 |
| Redhat | Enterprise Linux | Versions 7.0, 8.0 |
| Debian | Debian Linux | Version 9.0 |
Weakness classification
References
- NVD record
- CVE.org record
- https://bugzilla.redhat.com/show_bug.cgi?id=1949442
- https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/
- https://security.gentoo.org/glsa/202105-22
- https://security.netapp.com/advisory/ntap-20210430-0001/
- https://www.samba.org/samba/security/CVE-2021-20254.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1949442
- https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/
- https://security.gentoo.org/glsa/202105-22
- https://security.netapp.com/advisory/ntap-20210430-0001/
- https://www.samba.org/samba/security/CVE-2021-20254.html