#VU78991 Race condition in Samba - CVE-2021-20316

Vulnerability identifier: #VU78991

Vulnerability risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-20316

CWE-ID: CWE-362

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Samba
Server applications / Directory software, identity management

Vendor: Samba

Description

The vulnerability allows a remote user to escalate privileges on the system.

The vulnerability exists due to a race condition. A remote user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Samba: before 4.15.0, 4.15.0

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External links
https://www.samba.org/samba/security/CVE-2021-20316.html
https://bugzilla.redhat.com/show_bug.cgi?id=2009673
https://access.redhat.com/security/cve/CVE-2021-20316
https://security-tracker.debian.org/tracker/CVE-2021-20316
https://bugzilla.samba.org/show_bug.cgi?id=14842

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.