Vulnerability identifier: #VU6618

Vulnerability risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/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
Certified Asterisk
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 insufficient bounds checking. A remote attacker can send a specially crafted Skinny Client Control Protocol (SCCP) packet, trigger memory corruption and cause the affected device to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Update Asterisk to version 13.15.1 and 14.4.1.
Update Certified Asterisk to version 13.13-cert.

Vulnerable software versions

Asterisk Open Source: 13.0.1 - 13.15.0, 14.0 - 14.4.0

Certified Asterisk: 13.13

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External links
http://downloads.asterisk.org/pub/security/AST-2017-004.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.