Vulnerability identifier: #VU16064

Vulnerability risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-16671

CWE-ID: CWE-120

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 execute arbitrary code on the target system.

The vulnerability exists due to boundary error when setting the user field for Party B on a CDR. A remote unauthenticated attacker can send a specially-crafted request, trigger memory corruption and execute arbitrary code with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Update Asterisk Open Source 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 - 13.13-cert6

Asterisk Open Source: 13.0.0 - 13.23.1, 14.0 - 14.7.0, 15.0.0 - 15.1.0

---

External links
http://downloads.asterisk.org/pub/security/AST-2017-010.html

---

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.