#VU60187 Link following in Samba - CVE-2021-44141

Vulnerability identifier: #VU60187

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-44141

CWE-ID: CWE-59

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 gain access to sensitive information.

The vulnerability exists due to insecure link following. A remote user with ability to write files to the exported part of the file system under a share via SMB1 unix extensions or via NFS can create a symlink to determine if a file or directory exists in an area of the server file system not exported under the share definition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Samba: 1.9.16 - 1.9.18, 2.0 - 2.0.10, 2.2a - 2.2.12, 2.18.3, 3.0 - 3.0.37, 3.1 - 3.1.0, 3.2 - 3.2.15, 3.3 - 3.3.16, 3.4 - 3.4.17, 3.5 - 3.5.22, 3.6.0 - 3.6.25, 4.0.0 - 4.0.26, 4.1.0 - 4.15.4, 4.2.0 - 4.2.14, 4.3.0 - 4.3.13, 4.4.0 rc4 - 4.4.16, 4.5.0 - 4.5.16, 4.6.0 - 4.6.16, 4.7.0 - 4.7.12, 4.8.0 - 4.8.12, 4.9.0 - 4.9.18

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External links
https://www.samba.org/samba/security/CVE-2021-44141.html

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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.