CVE-2021-20254
Samba Array Indexing Vulnerability (SMB)
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.
INFO
Published Date :
May 5, 2021, 2:15 p.m.
Last Modified :
Nov. 7, 2023, 3:29 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.2
Exploitability Score :
1.6
Affected Products
The following products are affected by CVE-2021-20254
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-20254.
| URL | Resource |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1949442 | Issue Tracking Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html | Mailing List Third Party Advisory |
| 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 | Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20210430-0001/ | Third Party Advisory |
| https://www.samba.org/samba/security/CVE-2021-20254.html | Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-20254 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-20254 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference Red Hat, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/ [No types assigned] Added Reference Red Hat, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/ [No types assigned] Removed Reference Red Hat, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/ Removed Reference Red Hat, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/ -
Modified Analysis by [email protected]
Jun. 24, 2021
Action Type Old Value New Value Removed CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:P/A:N) Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:P/I:P/A:N) Removed CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Added CVSS V3.1 NIST AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html Mailing List, Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
May. 29, 2021
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html [No Types Assigned] -
Modified Analysis by [email protected]
May. 26, 2021
Action Type Old Value New Value Changed Reference Type https://security.gentoo.org/glsa/202105-22 No Types Assigned https://security.gentoo.org/glsa/202105-22 Third Party Advisory -
CVE Modified by [email protected]
May. 26, 2021
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/202105-22 [No Types Assigned] -
Initial Analysis by [email protected]
May. 14, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1949442 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1949442 Issue Tracking, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/ Mailing List, Third Party Advisory Changed Reference Type https://security.netapp.com/advisory/ntap-20210430-0001/ No Types Assigned https://security.netapp.com/advisory/ntap-20210430-0001/ Third Party Advisory Changed Reference Type https://www.samba.org/samba/security/CVE-2021-20254.html No Types Assigned https://www.samba.org/samba/security/CVE-2021-20254.html Vendor Advisory Added CPE Configuration OR *cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* versions from (including) 3.6.0 up to (excluding) 4.12.15 *cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* versions from (including) 4.13.0 up to (excluding) 4.13.8 *cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* versions from (including) 4.14.0 up to (excluding) 4.14.4 Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
May. 08, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/ [No Types Assigned] -
CVE Modified by [email protected]
May. 07, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/ [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-20254 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-20254
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.42 }} 0.27%
score
0.71366
percentile