QtWeb Browser version 3.3 build 043 Insecure DLL Hijacking Vulnerability (wintab32.dll)

1. OVERVIEW

The QtWeb Browser application is vulnerable to Insecure DLL Hijacking
Vulnerability. Similar terms that describe this vulnerability
have been come up with Remote Binary Planting, and Insecure DLL
Loading/Injection/Hijacking/Preloading.

2. PRODUCT DESCRIPTION

QtWeb Browser is a lightweight, secure and portable browser having
unique user interface and privacy features that
fills the gaps in most of players on browsers market
(http://www.qtweb.net/about.php).
It's open source project based on Nokia's Qt framework and Apple's
WebKit rendering engine used in Apple Safari
and Google Chrome.

3. VULNERABILITY DESCRIPTION

The QtWeb Browser application passes an insufficiently qualified path
in loading an external library, "wintab32.dll"
when a user opens its associated file with extensions - htm, html, mhtml.

4. VERSIONS AFFECTED

3.3 build 043 and lower

5. PROOF-OF-CONCEPT/EXPLOIT

http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/qtweb/poc/movie/
http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/qtweb/poc/qtweb.exe_3.3_build-043_wintab32.dll.zip

6. IMPACT

Attackers can trigger a successful exploit against a victim user in a
number of ways such as placing a malicious external
library file made as hidden attribute and a seemingly interesting file
in network shares, usb drives, file sharing networks,
social networks, …etc

7. SOLUTION

Fixed version from the vendor has not been released yet.
However, it is suggested that the following workarounds be deployed by
users to protect increasing mass exploitation of this
vulnerability class:

• Disable loading of libraries from WebDAV and remote network shares
• Disable the WebClient service
  Please see workaround solution links in References section.

8. VENDOR

LogicWare & LSoft Technologies
http://logic-ware.net/
http://www.qtweb.net/

9. CREDIT

This vulnerability was discovered by Aung Khant, http://yehg.net, YGN
Ethical Hacker Group, Myanmar.

10. DISCLOSURE TIME-LINE

08-29-2010: vulnerability discovered
08-29-2010: notified vendor
08-29-2010: vulnerability disclosed

11. REFERENCES

Original Advisory URL:
http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/[qtweb]_3.3-build-043_insecure_dll_hijacking_(wintab32.dll)
Workaround Solution: http://support.microsoft.com/kb/2264107
Workaround Solution:
https://www.microsoft.com/technet/security/advisory/2269637.mspx#EGF
Developer Solution:
http://msdn.microsoft.com/en-us/library/ff919712%28v=VS.85%29.aspx
Unofficial DLL Hijacking List:
http://www.corelan.be:8800/index.php/2010/08/25/dll-hijacking-kb-2269637-the-unofficial-list/

#yehg [08-29-2010]

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Best regards,
YGN Ethical Hacker Group
Yangon, Myanmar
http://yehg.net
Our Lab | http://yehg.net/lab
Our Directory | http://yehg.net/hwd