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TITLE:
Asterisk Two Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA49303

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/49303/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=49303

RELEASE DATE:
2012-05-30

DISCUSS ADVISORY:
http://secunia.com/advisories/49303/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/49303/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=49303

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
Two vulnerabilities have been reported in Asterisk, which can be
exploited by malicious people to cause a DoS (Denial of Service).

1) An error in IAX2 channel driver within the
"handle_request_update()" function (channels/chan_sip.c) when placing
an established call on hold can be exploited to cause a crash via
specially crafted packets.

Successful exploitation of this vulnerability requires that the
setting mohinterpret=passthrough is set and that the call is placed
on hold without a suggested music-on-hold class name.

2) An error in SCCP (Skinny) channel driver (channels/chan_skinny.c)
when handling termination of a client's connection can be exploited
to cause a crash by closing a connection to the server in certain
call states.

The vulnerabilities are reported in versions 1.8.11-cert prior to
1.8.11-cert2, 1.8.x prior to 1.8.12.1, and 10.x prior to 10.4.1.

SOLUTION:
Update to a fixed version.

Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

PROVIDED AND/OR DISCOVERED BY:
The vendor credits:
1) mgrobecker
2) Christoph Hebeisen

ORIGINAL ADVISORY:
http://downloads.asterisk.org/pub/security/AST-2012-007.html
http://downloads.asterisk.org/pub/security/AST-2012-008.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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