Vulnerability identifier: #VU9148

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Certified Asterisk
Server applications / Conferencing, Collaboration and VoIP solutions
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 in pjsip session resource due to insufficient handling of session objects. A remote attacker can submit specially crafted session objects for processing, consume excessive resources and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Update Asterisk to version 13.18.1, 14.7.1, 15.1.1.
Update Certified Asterisk to version 13.13-cert7.

Vulnerable software versions

Certified Asterisk: 13.13

Asterisk Open Source: 13.0.0 - 13.18.0, 14.0 - 14.7.0, 15.0.0 - 15.1.0

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External links
http://downloads.asterisk.org/pub/security/AST-2017-011.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.