Vulnerability identifier: #VU9736

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-17850

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 vulnerability exists due to an error when processing malicious SIP data. A remote attacker can send specially crafted SIP data without a contact header, trigger an error in the PJSIP channel driver and cause the service to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
The vulnerability is addressed in the following version.

Vulnerable software versions

Asterisk Open Source: 13.0.0 - 13.18.4, 14.0 - 14.7.4, 15.0.0 - 15.1.4

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External links
http://downloads.asterisk.org/pub/security/AST-2017-014.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.