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