#VU32569 Input validation error in Asterisk Open Source - CVE-2014-2287

Vulnerability identifier: #VU32569

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-2014-2287

CWE-ID: CWE-20

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 1.8.26.1, 11.8.x before 11.8.1, and 12.1.x before 12.1.1, and Certified Asterisk 1.8.15 before 1.8.15-cert5 and 11.6 before 11.6-cert2, when chan_sip has a certain configuration, allows remote authenticated users to cause a denial of service (channel and file descriptor consumption) via an INVITE request with a (1) Session-Expires or (2) Min-SE header with a malformed or invalid value.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Asterisk Open Source: 1.8.15.0 - 1.8.15.1

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External links
https://downloads.asterisk.org/pub/security/AST-2014-002.html
https://downloads.asterisk.org/pub/security/AST-2014-002-1.8.diff
https://lists.fedoraproject.org/pipermail/package-announce/2014-March/130400.html
https://lists.fedoraproject.org/pipermail/package-announce/2014-March/130426.html
https://www.mandriva.com/security/advisories?name=MDVSA-2014:078
https://www.securityfocus.com/bid/66094
https://issues.asterisk.org/jira/browse/ASTERISK-23373

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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.