Vulnerability identifier: #VU12324

Vulnerability risk: Medium

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: CVE-2009-4055

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Description
rtp.c in Asterisk Open Source 1.2.x before 1.2.37, 1.4.x before 1.4.27.1, 1.6.0.x before 1.6.0.19, and 1.6.1.x before 1.6.1.11; Business Edition B.x.x before B.2.5.13, C.2.x.x before C.2.4.6, and C.3.x.x before C.3.2.3; and s800i 1.3.x before 1.3.0.6 allows remote attackers to cause a denial of service (daemon crash) via an RTP comfort noise payload with a long data length.

Mitigation
Install update from vendor's website.

External links
http://downloads.asterisk.org/pub/security/AST-2009-010-1.2.diff.txt
http://downloads.asterisk.org/pub/security/AST-2009-010-1.4.diff.txt
http://downloads.asterisk.org/pub/security/AST-2009-010-1.6.0.diff.txt
http://downloads.asterisk.org/pub/security/AST-2009-010-1.6.1.diff.txt
http://downloads.digium.com/pub/security/AST-2009-010.html
http://securitytracker.com/id?1023249
http://www.debian.org/security/2009/dsa-1952
http://www.redhat.com/archives/fedora-package-announce/2009-December/msg00759.html
http://www.securityfocus.com/archive/1/archive/1/508147/100/0/threaded
http://www.securityfocus.com/bid/37153
http://www.vupen.com/english/advisories/2009/3368
http://exchange.xforce.ibmcloud.com/vulnerabilities/54471
http://issues.asterisk.org/view.php?id=16242

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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.