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TITLE:
Asterisk Two Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA49814

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/49814/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=49814

RELEASE DATE:
2012-07-06

DISCUSS ADVISORY:
http://secunia.com/advisories/49814/#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/49814/

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=49814

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 users to cause a DoS (Denial of Service).

1) An error when handling a provisional response from an endpoint
during a re-invite can be exploited to consume all RTP ports
resulting in inability to make further calls.

Successful exploitation of this vulnerability requires an attacker to
have the ability to place calls.

2) A double-free error exists when a single voicemail account is
manipulated by two callers at the same time and can be exploited to
cause a crash.

Please see the vendor's advisory for a list of affected versions.

SOLUTION:
Apply patches (please see the vendor's advisory for details).

PROVIDED AND/OR DISCOVERED BY:
The vendor credits:
1) Steve Davies
2) Nicolas Bouliane, Avencall Security Labs

ORIGINAL ADVISORY:
http://downloads.asterisk.org/pub/security/AST-2012-010.html
http://downloads.asterisk.org/pub/security/AST-2012-011.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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Definitions: (Criticality, Where etc.)
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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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