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Date: Mon, 13 Sep 2010 03:31:34 +0800 From: YGN Ethical Hacker Group <lists@...g.net> To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com, bugs@...uritytracker.com, vuln@...unia.com, secalert@...urityreason.com, news@...uriteam.com, vuln@...urity.nnov.ru Subject: Nitro PDF Reader version 2.5.1 <= Insecure DLL Hijacking Vulnerability (dwmapi.dll, nprender.dll) 1. OVERVIEW The Nitro PDF Reader 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 Nitro's new free PDF reader takes the key features that you want in a PDF reader, a familiar interface, and smooth functionality and combines them into an eminently usable program that doesn't get in between you and your documents. Nitro has turned the free PDF alternative business model on its ear by providing you with a smart selection of watermark-free editing, drag-and-drop PDF creation, and tabbed PDF reading. 3. VULNERABILITY DESCRIPTION The Nitro PDF Reader application passes an insufficiently qualified path in loading its external libraries - "dwmapi.dll, nprender.dll" when a user opens its associated file with extensions - fdf, pdf . (N.B. first launch with nprender.dll may not be successful. CPU Usage might jump up. Kill the application. Reopen the pdf and DLL Poup message will be seen) 4. VERSIONS AFFECTED 2.5.1 and probably lower versions 5. PROOF-OF-CONCEPT/EXPLOIT http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/nitro_pdf_reader/poc/movie/nitro_pdf-1.2.0.11_dll-hijacking.mp4 http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/nitro_pdf_reader/poc/nitro_pdf-1.2.0.11_dll-hijacking-poc.zip Tested Platform: Windows XP Service Pack 3 (Fresh Windows) 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 Nitro PDF Pty Ltd http://www.nitropdf.com/ 9. CREDIT This vulnerability was discovered by Aung Khant, http://yehg.net, YGN Ethical Hacker Group, Myanmar. 10. DISCLOSURE TIME-LINE 09-09-2010: notified vendor 09-13-2010: vulnerability disclosed 11. REFERENCES Original Advisory URL: http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/[nitro_pdf_reader]_2.5.1_insecure_dll_hijacking 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/ Testing for DLL Hijacking: http://core.yehg.net/lab/pr0js/view.php/when_testing_for_dll_hijacking.txt #yehg [09-13-2010] _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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