Vulnerability identifier: #VU33040

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-17141

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

HylaFAX 6.0.6 and HylaFAX+ 5.6.0 allow remote attackers to execute arbitrary code via a dial-in session that provides a FAX page with the JPEG bit enabled, which is mishandled in FaxModem::writeECMData() in the faxd/CopyQuality.c++ file.

Mitigation
Install update from vendor's website.

External links
http://git.hylafax.org/HylaFAX?a=commit;h=c6cac8d8cd0dbe313689ba77023e12bc5b3027be
http://www.openwall.com/lists/oss-security/2018/09/20/1
http://lists.debian.org/debian-lts-announce/2018/09/msg00026.html
http://seclists.org/bugtraq/2018/Sep/49
http://www.debian.org/security/2018/dsa-4298
http://www.x41-dsec.de/lab/advisories/x41-2018-008-hylafax/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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