Date: Mon, 18 Jul 2016 18:40:45 +0200 From: "Stefan Kanthak" <stefan.kanthak@...go.de> To: <oss-security@...ts.openwall.com> Cc: <fulldisclosure@...lists.org>, <bugtraq@...urityfocus.com> Subject: [CVE-2016-1281] NOT FIXED: VeraCrypt*Setup*.exe still vulnerable to DLL hijacking Hi @ll, this is basically a followup to <http://seclists.org/oss-sec/2016/q1/58> CVE-2016-1281 is NOT FIXED! I've retested the current "VeraCrypt Setup 1.17.exe" on a fully patched Windows 7, and it is STILL (or AGAIN) vulnerable there. The following DLLs are loaded from the "application directory" and their DllMain() executed: VSSAPI.dll, ATL.dll, VSSTrace.dll. See <https://cwe.mitre.org/data/definitions/426.html>, <https://cwe.mitre.org/data/definitions/427.html> and <https://capec.mitre.org/data/definitions/471.html> for details about this well-known and well-documented beginner's error! Due to the application manifest embedded in the executable installer which specifies "requireAdministrator" the installer is run with administrative privileges ("protected" administrators are prompted for consent, unprivileged standard users are prompted for an administrator password); execution of the DLLs therefore results in an escalation of privilege! For software downloaded with a web browser the "application directory" is typically the user's "Downloads" directory: see <https://insights.sei.cmu.edu/cert/2008/09/carpet-bombing-and-directory-poisoning.html>, <http://blog.acrossecurity.com/2012/02/downloads-folder-binary-planting.html> and <http://seclists.org/fulldisclosure/2012/Aug/134> for prior art! Mitigation: ~~~~~~~~~~~ DUMP executable installers, build packages for the target OS' native installer instead! See <http://home.arcor.de/skanthak/!execute.html> as well as <http://home.arcor.de/skanthak/sentinel.html> for the long sad story of these vulnerabilities. stay tuned Stefan Kanthak Timeline: ~~~~~~~~~ 2015-12-23 vulnerability report sent to author 2016-01-03 author confirmed vulnerability, got CVE-2016-1281 worked with author until he finally was able to build an installer which didn't show this vulnerability. Also notified author: "as soon as Microsoft introduces new/other dependencies between Windows' system DLLs or refactors them (again) this vulnerability will VERY likely resurface again." 2016-01-11 report published by author (see above) 2016-07-01 vulnerability report sent to author ("I told you so!") NO RESPONSE 2016-07-17 report published
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