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TITLE:
Asterisk Two Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA43722

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43722/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43722

RELEASE DATE:
2011-03-17

DISCUSS ADVISORY:
http://secunia.com/advisories/43722/#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/43722/

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=43722

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) The Asterisk Manager Interface does not properly handle failed
writes to manager clients, which can be exploited to cause a CPU and
memory exhaustion by opening, sending invalid data, and closing
multiple connections in a short period of time.

Successful exploitation requires that the manager interface is
enabled (disabled by default).

2) A NULL pointer dereference error within the
"handle_tcptls_connection()" function in main/tcptls.c can be
exploited to cause a crash by opening multiple connections to
services using the "ast_tcptls_*" API (e.g. chan_sip, manager, and
res_phoneprov) in a short period of time.

The vulnerabilities are reported in Asterisk Open Source versions
1.6.1.x prior to 1.6.1.23, 1.6.2.x prior to 1.6.2.17.1, and 1.8.x
prior to 1.8.3.1.

SOLUTION:
Update to versions 1.6.1.23, 1.6.2.17.1, or 1.8.3.1 or apply
patches.

Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

PROVIDED AND/OR DISCOVERED BY:
The vendor credits:
1) Blake Cornell
2) Blake Cornell and Chris Maj

ORIGINAL ADVISORY:
1) http://downloads.asterisk.org/pub/security/AST-2011-003.html
2) http://downloads.asterisk.org/pub/security/AST-2011-004.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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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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