Insecure library loading in Samba

1) Insecure library loading

EUVDB-ID: #VU6676

Risk: Medium

CVSSv3.1: 8.6 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2017-7494

CWE-ID: CWE-426 - Untrusted Search Path

Exploit availability: Yes

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 - 4.6.3

External links

http://www.samba.org/samba/security/CVE-2017-7494.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.