Vulnerability identifier: #VU14789

Vulnerability risk: High

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-16657

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Kamailio
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor: Kamailio

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing SIP messages with an invalid "Via" header within the crcitt_string_array() and check_via_address() functions. A remote attacker can send a specially crafted SIP message, trigger memory corruption and crash the service or execute arbitrary code.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Kamailio: 5.0.0 - 5.1.3

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External links
http://lists.debian.org/debian-lts-announce/2018/09/msg00013.html
http://skalatan.de/blog/advisory-hw-2018-06
http://www.debian.org/security/2018/dsa-4292

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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. However, proof of concept for this vulnerability is available.