#VU86856 Permissions, Privileges, and Access Controls in Samba - CVE-2020-25720

Vulnerability identifier: #VU86856

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-25720

CWE-ID: CWE-264

Exploitation vector: Local network

Exploit availability: No

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

Vendor: Samba

Description

The vulnerability allows a local user to escalate privileges within the network.

The vulnerability exists due to create child permissions allows full write access to all attributes. A local user can escalate privileges within the network.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Samba: 4.17.0 - 4.17.8

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External links
https://bugzilla.samba.org/show_bug.cgi?id=14810
https://gitlab.com/samba-team/samba/-/commit/cc64ea24daa649dc8de4a212c7abfbe111095655
https://gitlab.com/samba-team/samba/-/merge_requests/2514

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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