#VU6676 Insecure library loading in Samba - CVE-2017-7494

Vulnerability identifier: #VU6676

Vulnerability risk: Medium

CVSSv4.0: 9.4 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/U:Green]

CVE-ID: CVE-2017-7494

CWE-ID: CWE-426

Exploitation vector: Local network

Exploit availability: Yes

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

Vendor: Samba

Description
The vulnerability allows a remote authenticated attacker to execute arbitrary code on vulnerable server.

The vulnerability exists due to insecure library loading mechanism, when processing files on file shares. A remote attacker with ability to upload file on SMB share can upload and execute arbitrary shared library on the server with privileges of the Samba process.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation
The vulnerability is fixed in versions: 4.6.4, 4.5.10 and 4.4.14.

Vulnerable software versions

Samba: 3.5.0 - 3.5.22, 3.6.0 - 3.6.25, 4.0.0 - 4.0.26, 4.1.0 - 4.1.23, 4.2.0 - 4.2.14, 4.3.0 - 4.3.13, 4.4.0 rc4 - 4.4.13, 4.5.0 - 4.5.9, 4.6.0 - 4.6.3

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External links
https://www.samba.org/samba/security/CVE-2017-7494.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 local network (LAN).

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.