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CVE-2021-20254
MEDIUM6.8
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.
CVE Details
CVSS v3.1 Score6.8
SeverityMEDIUM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack VectorNETWORK
ComplexityHIGH
Privileges RequiredLOW
User InteractionNONE
Published5/5/2021
Last Modified11/21/2024
Sourcenvd
Honeypot Sightings0
Affected Products
debian:debian_linuxfedoraproject:fedoraredhat:enterprise_linuxsamba:samba
Weaknesses (CWE)
CWE-125
References
https://bugzilla.redhat.com/show_bug.cgi?id=1949442(secalert@redhat.com)
https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html(secalert@redhat.com)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/(secalert@redhat.com)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/(secalert@redhat.com)
https://security.gentoo.org/glsa/202105-22(secalert@redhat.com)
https://security.netapp.com/advisory/ntap-20210430-0001/(secalert@redhat.com)
https://www.samba.org/samba/security/CVE-2021-20254.html(secalert@redhat.com)
https://bugzilla.redhat.com/show_bug.cgi?id=1949442(af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html(af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/(af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/(af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/202105-22(af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20210430-0001/(af854a3a-2127-422b-91ae-364da2661108)
https://www.samba.org/samba/security/CVE-2021-20254.html(af854a3a-2127-422b-91ae-364da2661108)
IOC Correlations
No correlations recorded
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