===================================================================== PGP Desktop version 9.10.x-10.0.0 Insecure DLL Hijacking Vulnerability (tsp.dll, tvttsp.dll) ===================================================================== 1. OVERVIEW The PGP Desktop 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 PGP Desktop Email provides enterprises with an automatic, transparent encryption solution for securing internal and external confidential email communications. With PGP Desktop Email, organizations can minimize the risk of a data breach and comply with partner and regulatory mandates for information security and privacy. (http://www.pgp.com/products/desktop_email/index.html) 3. VULNERABILITY DESCRIPTION The PGP Desktop application passes an insufficiently qualified path in loading its external libraries - "tsp.dll, tvttsp.dll" when a user opens its associated file with extensions - .p12, .pem, .pgp, .prk, .prvkr, .pubkr, .rnd, .skr . 4. VERSIONS AFFECTED 9.10.x-10.0.0 5. PROOF-OF-CONCEPT/EXPLOIT http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/pgp_desktop/poc/ movie/pgpdesktop-9.10_dll_hijacking.mp4 http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/pgp_desktop/poc/ movie/pgpdesktop-10.0_dll_hijacking.mp4 http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/pgp_desktop/poc/ pgp-9.x-10.0.x_dll-hijacking-poc-dll.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 PGP Corporation http://www.pgp.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: vulnerability discovered 09-09-2010: notified vendor 09-09-2010: vulnerability disclosed 11. REFERENCES Original Advisory URL: http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/[pgp_desktop]_9x -10.0.0_insecure_dll_hijacking_(tsp.dll,tvttsp.dll) Related: PGP 9.8 DLL Hijacking: http://www.corelan.be:8800/index.php/2010/08/25/dll-hijacking-kb-2269637 -the-unofficial-list/ 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 Testing for DLL Hijacking: http://core.yehg.net/lab/pr0js/view.php/when_testing_for_dll_hijacking.t xt #yehg [09-09-2010]