Vulnerability identifier: #VU15900

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-19278

CWE-ID: CWE-120

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Asterisk Open Source
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor: Digium (Linux Support Services)

Description
The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to buffer overflow in dns_srv and dns_naptr functions when handling malicious input. A remote attacker can supply a specially crafted DNS SRV or NAPTR response, trigger segfault and cause the service to crash.

Mitigation
The vulnerability has been fixed in the version 15.6.2, 16.0.1.

Vulnerable software versions

Asterisk Open Source: 16.0.0, 15.0.0 - 15.6.1

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External links
http://downloads.asterisk.org/pub/security/AST-2018-010.html

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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.