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TITLE:
Qt QUtf8Decoder Off-By-One Vulnerability

SECUNIA ADVISORY ID:
SA26811

VERIFY ADVISORY:
http://secunia.com/advisories/26811/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
Qt 3.x
http://secunia.com/product/383/
Qt 4.x
http://secunia.com/product/12368/

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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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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