Out-of-bounds read in Samba



Published: 2021-04-29
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
Server applications / Directory software, identity management

Vendor Samba

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: 4.14.0 - 4.14.3, 4.13.0 - 4.13.7, 4.12.0 - 4.12.14, 4.11.0 - 4.11.17, 4.10.0 - 4.10.18, 4.9.0 - 4.9.18, 4.8.0 - 4.8.12, 4.7.0 - 4.7.12, 4.6.0 - 4.6.16, 4.5.0 - 4.5.16, 4.4.0 - 4.4.16, 4.3.0 - 4.3.13, 4.2.0 - 4.2.14, 4.1.0 - 4.1.23, 4.0.0 - 4.0.26, 3.6.0 - 3.6.25


CPE2.3 External links

http://www.samba.org/samba/security/CVE-2021-20254.html

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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