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>> Asterisk Products Buffer Overflow and Security Bypass Vulnerabilities
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Multiple vulnerabilities have been identified in various Asterisk products, which could be exploited by attackers or malicious users to bypass security restrictions, cause a denial of service or compromise a vulnerable system.
The first issue is caused by buffer overflow errors in the RTP payload handling code when processing a malformed INVITE or SIP packet with SDP, which could be exploited by attackers to crash an affected application or execute arbitrary code.
The second vulnerability is caused by an error in the SIP channel driver when handling invalid "From" headers, which could be exploited by attackers to perform unauthenticated calls.
The third issue is caused by an error when displaying certain messages using the "ast_verbose()" logging API call or the Manager command "command", which could be exploited to crash an affected application.
The fourth issue is caused by an eror when calculating manager IDs, which could be exploited by attackers to predict the manager ID and hijack a manager session.
Affected Products
Asterisk Open Source versions 1.0.x
Asterisk Open Source versions 1.2.x
Asterisk Open Source versions 1.4.x
Asterisk Business Edition versions A.x.x
Asterisk Business Edition versions B.x.x
Asterisk Business Edition versions C.x.x
AsteriskNOW versions 1.0.x
Asterisk Appliance Developer Kit
Asterisk Appliance s800i versions 1.0.x
Solution
Upgrade to Asterisk Open Source version 1.2.27, 1.4.18.1, 1.4.19-rc3 or 1.6.0-beta6 :
http://downloads.digium.com/pub/telephony/asterisk
Upgrade to Asterisk Business Edition version 1B.2.5.1 or C.1.6.2 :
http://downloads.digium.com/
Upgrade to AsteriskNOW version 1.0.2 :
http://www.asterisknow.org/
Upgrade to the lastest Asterisk Appliance Developer Kit (Asterisk 1.4) revision.
Upgrade to Asterisk Appliance s800i version 1.1.0.2.
References
http://www.vupen.com/english/advisories/2008/0928
http://downloads.digium.com/pub/security/AST-2008-002.html
http://downloads.digium.com/pub/security/AST-2008-003.html
http://downloads.digium.com/pub/security/AST-2008-004.html
http://downloads.digium.com/pub/security/AST-2008-005.html
Credits
Vulnerabilities reported by Mu Security Research Team, Jason Parker, Steve Davies, Brandon Kruse and Dino A. Dai Zovi.
ChangeLog
2008-03-19 : Initial release
Vulnerability Management
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