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Synthesis of the vulnerability 
An authenticated attacker can use two vulnerabilities of Asterisk, in order to execute a shell command, or to bypass ACL.
 Vulnerable software: Asterisk Open Source, Debian, Fedora.
Severity of this announce: 2/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 31/08/2012.
Références of this computer vulnerability: AST-2012-012, AST-2012-013, BID-55335, BID-55351, CERTA-2012-AVI-478, CVE-2012-2186, CVE-2012-4737, DSA-2550-1, DSA-2550-2, FEDORA-2012-13338, FEDORA-2012-13437, VIGILANCE-VUL-11911.
Description of the vulnerability 
Two vulnerabilities were announced in Asterisk.
An authenticated attacker can use the action AMI Originate with the application ExternalIVR, in order to execute a shell command. [severity:2/4; AST-2012-012, BID-55351, CVE-2012-2186]
An attacker, who is authenticated with ARA (Asterisk Realtime Architecture), can make an IAX2 call bypassing ACL rules. [severity:2/4; AST-2012-013, BID-55335, CVE-2012-4737]
An authenticated attacker can therefore use two vulnerabilities of Asterisk, in order to execute a shell command, or to bypass ACL.
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This computer vulnerability note impacts software or systems such as Asterisk Open Source, Debian, Fedora.
Our Vigil@nce team determined that the severity of this computer vulnerability announce is medium.
The trust level is of type confirmed by the editor, with an origin of intranet client.
This bulletin is about 2 vulnerabilities.
An attacker with a expert ability can exploit this cybersecurity announce.
Solutions for this threat 
Asterisk: version 10.7.1.
The version 10.7.1 is corrected:
http://www.asterisk.org/
Asterisk: version 1.8.15.1.
The version 1.8.15.1 is corrected:
http://www.asterisk.org/
Debian: new asterisk packages.
New packages are available:
asterisk 1:1.6.2.9-2+squeeze8
Fedora: new asterisk packages.
New packages are available:
asterisk-1.8.15.1-1.fc16
asterisk-10.7.1-2.fc17
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Computer vulnerabilities tracking service 
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