Vulnerability identifier: #VU9682

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-119

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 attacker to cause DoS condition on the target system.

The weakness exists due to boundary error when handling user-supplied input. A remote attacker can establish a call to the target system and send a specially crafted compound RTCP packet containing more than one report, trigger memory corruption and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Update to version 13.18.4, 14.7.4, 15.1.4.

Vulnerable software versions

Asterisk Open Source: 13.0.0 - 13.18.3, 14.0 - 14.7.3, 15.0.0 - 15.1.3

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External links
http://downloads.asterisk.org/pub/security/AST-2017-012.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.