#VU32780 Resource management error in Asterisk Open Source - CVE-2012-3863

Vulnerability identifier: #VU32780

Vulnerability risk: Low

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

CVE-ID: CVE-2012-3863

CWE-ID: CWE-399

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 perform service disruption.

channels/chan_sip.c in Asterisk Open Source 1.8.x before 1.8.13.1 and 10.x before 10.5.2, Asterisk Business Edition C.3.x before C.3.7.5, Certified Asterisk 1.8.11-certx before 1.8.11-cert4, and Asterisk Digiumphones 10.x.x-digiumphones before 10.5.2-digiumphones does not properly handle a provisional response to a SIP reINVITE request, which allows remote authenticated users to cause a denial of service (RTP port exhaustion) via sessions that lack final responses.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Asterisk Open Source: c.3.0 - c.3.7.5, 1.8.0 - 1.8.32.0, 10.5.0 - 10.5.1

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External links
https://downloads.asterisk.org/pub/security/AST-2012-010.html
https://secunia.com/advisories/50687
https://secunia.com/advisories/50756
https://www.debian.org/security/2012/dsa-2550
https://www.securityfocus.com/bid/54327
https://issues.asterisk.org/jira/browse/ASTERISK-19992

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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.