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Qt QUtf8Decoder Off-By-One Vulnerability
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Secunia Advisory:
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SA26811
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Release Date:
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2007-09-14
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Popularity:
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5,310 views
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Critical:
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Moderately critical
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Impact:
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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: | Qt 3.x
Qt 4.x
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| CVE reference: | CVE-2007-4137
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Description:
A vulnerability has been reported in Qt, which can potentially be exploited by malicious people to cause a DoS (Denial of Service) or to compromise an application using the library.
The vulnerability is caused due to an off-by-one error within the "QUtf8Decoder::toUnicode()" function ("QUtf8Codec::convertToUnicode()" in Qt 4.x) in codecs/qutfcodec.cpp. This can be exploited to cause a one-byte heap-based buffer overflow via a specially crafted unicode string.
The vulnerability is reported in Qt versions 3.x and 4.x.
NOTE: The vulnerability is reportedly not exploitable in Qt 4.x.
Solution:
Apply patches.
Qt 3.3.8:
http://www.trolltech.com/developer/download/175791_3.diff
Qt 4.3.1:
http://www.trolltech.com/developer/download/175791_4.diff
Provided and/or discovered by:
The vendor credits Dirk Mueller of KDE.
Original Advisory:
http://trolltech.com/company/newsroom/announcements/press.2007-09-03.7564032119
Other References:
https://bugzilla.redhat.com/show_bug.cgi?id=269001
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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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