Red Hat Enterprise Linux 7 update for samba



Published: 2021-06-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-20254
CWE-ID CWE-125
Exploitation vector Local network
Public exploit N/A
Vulnerable software
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samba (Red Hat package)
Operating systems & Components / Operating system package or component

Red Hat Enterprise Linux Resilient Storage for x86_64
Operating systems & Components / Operating system

Red Hat Enterprise Linux for Power, little endian
Operating systems & Components / Operating system

Red Hat Enterprise Linux for Power, big endian
Operating systems & Components / Operating system

Red Hat Enterprise Linux for IBM z Systems
Operating systems & Components / Operating system

Red Hat Enterprise Linux for Scientific Computing
Operating systems & Components / Operating system

Red Hat Enterprise Linux Desktop
Operating systems & Components / Operating system

Red Hat Enterprise Linux Workstation
Operating systems & Components / Operating system

Red Hat Enterprise Linux Server
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Out-of-bounds read

EUVDB-ID: #VU52748

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-20254

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when mapping Windows group identities (SIDs) into unix group identities (gids), which resulted into negative idmap cache entries created in the Samba server process token. An attacker who can manage to trigger the vulnerability can crash the Samba server or potentially perform unauthorized actions on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

samba (Red Hat package): 4.10.16-9.el7_9

Red Hat Enterprise Linux Resilient Storage for x86_64: 7

Red Hat Enterprise Linux for Power, little endian: 7

Red Hat Enterprise Linux for Power, big endian: 7

Red Hat Enterprise Linux for IBM z Systems: 7

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

Red Hat Enterprise Linux Server: 7


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:2313

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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