#VU31210 OS Command Injection in Mgetty+Sendfax - CVE-2018-16744

Vulnerability identifier: #VU31210

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-16744

CWE-ID: CWE-78

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Mgetty+Sendfax
Client/Desktop applications / Other client software

Vendor: EDV-Beratung Gert Döring

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

An issue was discovered in mgetty before 1.2.1. In fax_notify_mail() in faxrec.c, the mail_to parameter is not sanitized. It could allow for command injection if untrusted input can reach it, because popen is used.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Mgetty+Sendfax: 1.2.0

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External links
https://www.x41-dsec.de/lab/advisories/x41-2018-007-mgetty

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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