#VU32755 Permissions, Privileges, and Access Controls in Asterisk Open Source - CVE-2012-4737

Vulnerability identifier: #VU32755

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2012-4737

CWE-ID: CWE-264

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 #AU# to read and manipulate data.

channels/chan_iax2.c in Asterisk Open Source 1.8.x before 1.8.15.1 and 10.x before 10.7.1, Certified Asterisk 1.8.11 before 1.8.11-cert7, Asterisk Digiumphones 10.x.x-digiumphones before 10.7.1-digiumphones, and Asterisk Business Edition C.3.x before C.3.7.6 does not enforce ACL rules during certain uses of peer credentials, which allows remote authenticated users to bypass intended outbound-call restrictions by leveraging the availability of these credentials.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Asterisk Open Source: 1.8.11.0 - 1.8.11.1

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External links
https://downloads.asterisk.org/pub/security/AST-2012-013.html
https://secunia.com/advisories/50687
https://secunia.com/advisories/50756
https://www.debian.org/security/2012/dsa-2550
https://www.securityfocus.com/bid/55335
https://www.securitytracker.com/id?1027461

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.