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>> Trolltech Qt "QString::fromUtf8()" Sequence Decoding Security Bypass Vulnerability

Title : Trolltech Qt "QString::fromUtf8()" Sequence Decoding Security Bypass Vulnerability
VUPEN ID : VUPEN/ADV-2007-1212
CVE ID : CVE-2007-0242
Rated as : Moderate Risk 
Remotely Exploitable : Yes
Locally Exploitable : Yes
Release Date : 2007-04-03


Technical Description    Receive VUPEN Security alerts in a Text format  Receive VUPEN Security alerts in a PDF format  Receive VUPEN Security alerts in an XML format 

A vulnerability has been identified in Trolltech Qt, which could be exploited by attackers to bypass security restrictions. This issue is due to an input validation error in the "QString::fromUtf8()" [tools/qstring.cpp] function that does not reject overly long UTF-8 sequences, which could be exploited to e.g. conduct directory traversal attacks or cause arbitrary scripting code to be executed in the security context of an application linked against a vulnerable library.

Affected Products

Trolltech Qt version 3.3.8 and prior
Trolltech Qt version 4.2.3 and prior

Solution

Apply patch for Qt 3.3.8 :
http://www.trolltech.com/developer/download/Qt-3.3.8-UTF-8-fix.diff

Apply patch for Qt 4.2.3 :
http://www.trolltech.com/developer/download/Qt-4.2.3-UTF-8-fix.diff

References

http://www.vupen.com/english/advisories/2007/1212
http://www.trolltech.com/company/newsroom/announcements/press.2007-03-30.9172215350

Credits

Vulnerability reported by Andreas Nolden

ChangeLog

2007-04-03 : Initial release

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