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UltraVNC vncviewer "ClientConnection::NegotiateProtocolVersion()" Buffer Overflow
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Secunia Advisory:
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SA28747
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Release Date:
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2008-02-01
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Last Update:
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2008-03-17
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Popularity:
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7,301 views
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Critical:
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Moderately critical
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Impact:
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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: | UltraVNC (formerly Ultr@VNC) 1.x
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Binary Analysis:
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BA377 :: Available for 1 Credit 
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| CVE reference: | CVE-2008-0610
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Description:
A vulnerability has been discovered in UltraVNC, which can be exploited by malicious people to compromise a user's system.
The vulnerability is caused due the "ClientConnection::NegotiateProtocolVersion()" function in vncviewer/ClientConnection.cpp using user-supplied length values to copy data without proper bounds checking. This can be exploited to cause a stack-based buffer overflow by e.g. sending specially crafted data to a vncviewer in "LISTENING" mode or by tricking a user into connecting to a malicious VNC server.
Successful exploitation allows execution of arbitrary code.
This may also be exploited if a DSM plugin is used, but requires that the attacker owns the encryption key used by vncviewer.
The vulnerability is confirmed in version 1.0.2 and reported in release candidates of version 1.0.4 prior to January 25th, 2008. Reportedly, UltraVNC server is not affected.
Solution:
Apply updated version.
http://downloads.sourceforge.net/ultr...traVNC-Viewer-104-Security-Update.zip
Provided and/or discovered by:
Reported by the vendor.
Changelog:
2008-02-07: Added CVE reference.
2008-03-17: Added link to US-CERT.
Original Advisory:
http://forum.ultravnc.info/viewtopic.php?t=11850
Other References:
US-CERT VU#721460:
http://www.kb.cert.org/vuls/id/721460
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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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