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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.

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Secunia NEVER sends attached files with advisories.
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