Vulnerability identifier: #VU10717

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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

Vendor: Digium (Linux Support Services)

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

The weakness exists due to insufficient validation of Session Description Protocol (SDP) messages. A remote attacker can submit a specially crafted SDP message, which contains an improper fmtp attribute and cause the service to crash.

Mitigation
Update to version 13.19.2, 14.7.6, 15.2.2.

Vulnerable software versions

Asterisk Open Source: 15.0.0 - 15.2.1, 13.0.0 - 13.18.5, 14.0 - 14.7.5

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External links
http://downloads.asterisk.org/pub/security/AST-2018-003.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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