CVE-2021-20254medium
New! CVE Severity Now Using CVSS v3
The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.
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://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://security.gentoo.org/glsa/202105-22
https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html
Details
Source: MITRE
Published: 2021-05-05
Updated: 2021-06-24
Type: CWE-125
Risk Information
CVSS v2
Base Score: 4.9
Vector: AV:N/AC:M/Au:S/C:P/I:P/A:N
Impact Score: 4.9
Exploitability Score: 6.8
Severity: MEDIUM
CVSS v3
Base Score: 6.8
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Impact Score: 5.2
Exploitability Score: 1.6
Severity: MEDIUM
Vulnerable Software
Configuration 1
OR
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
Configuration 2
OR
Configuration 3
OR
Configuration 4
OR
Tenable Plugins
| ID | Name | Product | Family | Severity |
|---|---|---|---|---|
| 155741 | RHEL 8 : samba (RHSA-2021:4866) | Nessus | Red Hat Local Security Checks | medium |
| 154870 | CentOS 8 : samba (CESA-2021:4058) | Nessus | CentOS Local Security Checks | medium |
| 154847 | RHEL 8 : samba (RHSA-2021:4058) | Nessus | Red Hat Local Security Checks | medium |
| 154844 | Oracle Linux 8 : samba (ELSA-2021-4058) | Nessus | Oracle Linux Local Security Checks | medium |
| 154670 | RHEL 7 : samba (RHSA-2021:3988) | Nessus | Red Hat Local Security Checks | medium |
| 154613 | NewStart CGSL CORE 5.04 / MAIN 5.04 : samba Vulnerability (NS-SA-2021-0114) | Nessus | NewStart CGSL Local Security Checks | medium |
| 154383 | EulerOS 2.0 SP3 : samba (EulerOS-SA-2021-2615) | Nessus | Huawei Local Security Checks | medium |
| 153887 | RHEL 8 : samba (RHSA-2021:3724) | Nessus | Red Hat Local Security Checks | medium |
| 153886 | RHEL 7 : samba (RHSA-2021:3723) | Nessus | Red Hat Local Security Checks | critical |
| 153580 | SUSE SLED15 / SLES15 Security Update : samba (SUSE-SU-2021:3187-1) | Nessus | SuSE Local Security Checks | medium |
| 153579 | openSUSE 15 Security Update : samba (openSUSE-SU-2021:3187-1) | Nessus | SuSE Local Security Checks | medium |
| 153277 | EulerOS 2.0 SP2 : samba (EulerOS-SA-2021-2446) | Nessus | Huawei Local Security Checks | medium |
| 153050 | EulerOS 2.0 SP5 : samba (EulerOS-SA-2021-2347) | Nessus | Huawei Local Security Checks | medium |
| 152402 | EulerOS 2.0 SP8 : samba (EulerOS-SA-2021-2315) | Nessus | Huawei Local Security Checks | medium |
| 152333 | EulerOS 2.0 SP9 : samba (EulerOS-SA-2021-2282) | Nessus | Huawei Local Security Checks | medium |
| 152330 | EulerOS 2.0 SP9 : samba (EulerOS-SA-2021-2256) | Nessus | Huawei Local Security Checks | medium |
| 151563 | EulerOS Virtualization 2.9.1 : samba (EulerOS-SA-2021-2179) | Nessus | Huawei Local Security Checks | medium |
| 151550 | EulerOS Virtualization 2.9.0 : samba (EulerOS-SA-2021-2200) | Nessus | Huawei Local Security Checks | medium |
| 151299 | EulerOS Virtualization for ARM 64 3.0.2.0 : samba (EulerOS-SA-2021-2079) | Nessus | Huawei Local Security Checks | medium |
| 151266 | Amazon Linux 2 : samba (ALAS-2021-1680) | Nessus | Amazon Linux Local Security Checks | medium |
| 150767 | CentOS 7 : samba (CESA-2021:2313) | Nessus | CentOS Local Security Checks | medium |
| 150655 | SUSE SLES11 Security Update : samba (SUSE-SU-2021:14709-1) | Nessus | SuSE Local Security Checks | high |
| 150478 | Scientific Linux Security Update : samba on SL7.x i686/x86_64 (2021:2313) | Nessus | Scientific Linux Local Security Checks | medium |
| 150425 | Oracle Linux 7 : samba (ELSA-2021-2313) | Nessus | Oracle Linux Local Security Checks | medium |
| 150378 | RHEL 7 : samba (RHSA-2021:2313) | Nessus | Red Hat Local Security Checks | medium |
| 150107 | Debian DLA-2668-1 : samba security update | Nessus | Debian Local Security Checks | medium |
| 149562 | openSUSE Security Update : samba (openSUSE-2021-636) | Nessus | SuSE Local Security Checks | high |
| 149350 | Samba 3.6.x < 4.12.15 / 4.13.x < 4.13.8 / 4.14.x < 4.14.4 Unauthorized File Access | Nessus | Misc. | medium |
| 149270 | SUSE SLES15 Security Update : samba (SUSE-SU-2021:1498-1) | Nessus | SuSE Local Security Checks | high |
| 149263 | SUSE SLES12 Security Update : samba (SUSE-SU-2021:1492-1) | Nessus | SuSE Local Security Checks | high |
| 149231 | FreeBSD : samba -- negative idmap cache entries vulnerability (6f33d38b-aa18-11eb-b3f1-005056a311d1) | Nessus | FreeBSD Local Security Checks | medium |
| 149195 | SUSE SLES12 Security Update : samba (SUSE-SU-2021:1439-1) | Nessus | SuSE Local Security Checks | high |
| 149185 | SUSE SLED15 / SLES15 Security Update : samba (SUSE-SU-2021:1444-1) | Nessus | SuSE Local Security Checks | high |
| 149174 | SUSE SLES12 Security Update : samba (SUSE-SU-2021:1438-1) | Nessus | SuSE Local Security Checks | high |
| 149152 | SUSE SLES12 Security Update : samba (SUSE-SU-2021:1442-1) | Nessus | SuSE Local Security Checks | high |
| 149135 | SUSE SLES15 Security Update : samba (SUSE-SU-2021:1445-1) | Nessus | SuSE Local Security Checks | high |
| 149093 | Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 / 21.04 : Samba vulnerability (USN-4930-1) | Nessus | Ubuntu Local Security Checks | medium |