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Asterisk Multiple Vulnerabilities
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Secunia Advisory:
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SA29426
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Release Date:
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2008-03-19
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Last Update:
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2008-03-20
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Popularity:
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4,288 views
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Critical:
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Highly critical
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Impact:
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Security Bypass
DoS
System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Asterisk 1.x
Asterisk Appliance Developer Kit 0.x
Asterisk Business Edition 2.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2008-1289
CVE-2008-1332
CVE-2008-1333
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Description:
Some vulnerabilities have been reported in Asterisk, which can be exploited by malicious people to bypass certain security restrictions, cause a DoS (Denial of Service), and potentially compromise a vulnerable system.
1) An error within the "ast_rtp_unset_m_type()" function in main/rtp.c when handling of RTP codec payloads can be exploited to write a 0 into certain memory locations by sending a specially crafted SIP packet with SDP containing a payload number greater than 256.
2) A boundary error within the "process_sdp()" function in channels/chan_sip.c when handling of RTP codec payloads can be exploited to cause a stack-based buffer overflow by sending more than 32 RTP payloads.
3) An error within the SIP channel driver when determining if authentication is required can be exploited to perform unauthenticated calls by sending specially crafted From headers to the driver.
Note: A format string error within the "ast_verbose()" logging API call has also been reported by Steve Davies and Brandon Kruse. This can be exploited to crash the application by providing input containing format specifiers, which is later used in the affected API call. However, this only affects Asterisk 1.6.x versions prior to 1.6.0-beta6.
Solution:
Update to a fixed version.
Asterisk 1.2.x:
Update to version 1.2.27.
Asterisk 1.4.x:
Update to version 1.4.18.1.
Asterisk Business Edition:
Update to version B.2.5.1 and C.1.6.2.
s800i (Asterisk Appliance):
Update to version 1.1.0.2.
Asterisk Appliance Developer Kit:
Fixed in the SVN repository. Please see the vendor's advisories for details.
Provided and/or discovered by:
1, 2) Mu Security Research Team
3) Jason Parker
Changelog:
2008-03-20: Updated "Description" section with additional information provided by Mu Security Research. Added link to "Original Advisory" section.
Original Advisory:
Digium:
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
Mu Security:
http://labs.musecurity.com/advisories/MU-200803-01.txt
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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