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Message-ID: <4E614E7D.1030204@fibertel.com.ar> Date: Fri, 02 Sep 2011 18:45:33 -0300 From: root <root_@...ertel.com.ar> To: full-disclosure@...ts.grok.org.uk Subject: Re: Cybsec Advisory 2011 0901 Windows Script Host DLL Hijacking You don't get the worst part: unsuccessful exploitation also leads to code execution. Scary stuff. On 09/02/2011 05:05 PM, Mario Vilas wrote: > Are you guys seriously reporting that double clicking on a malicious .vbs > file could lead to remote code execution? :P > > Either I'm missing something (and I'd welcome a rebuttal here!) or you might > as well add .exe to that list. All those extensions are already executable. > > On Fri, Sep 2, 2011 at 7:35 PM, CYBSEC Labs <cybseclabs@...sec.com> wrote: > >> ** >> Advisory Name: Windows Script Host DLL Hijacking >> >> Internal Cybsec Advisory Id: >> 2011-0901-Windows Script Host DLL Hijacking >> >> Vulnerability Class: >> Remote Command Execution Vulnerability >> >> Release Date: >> September 2, 2011 >> >> Affected Applications: >> Windows Script Host v5.6; other versions may also be affected >> >> Affected Platforms: >> Any running Windows Script Host v5.6 >> >> Local / Remote: >> Remote / Local >> >> Severity: >> High – CVSS: 9.3 (AV:N/AC:M/Au:N/C:C/I:C/A:C) >> >> Researcher: >> Juan Manuel Garcia >> >> Vendor Status: >> Acknowedged >> >> Reference to Vulnerability Disclosure Policy >> : http://www.cybsec.com/vulnerability_policy.pdf >> >> Vulnerability Description: >> >> DLL Hijacking takes advantage of the way an application dynamically >> >> loads dll libraries without specifying a fully qualified path. This is >> >> usually done invoking the LoadLibrary and LoadLibraryEx functions to >> >> dynamically load DLLs. >> >> In order to exploit this vulnerability a user must open a file with an >> >> extension associated to the vulnerable application. A malicious dll, >> >> named exactly as a dll the apllications loads using the vulnerable >> >> function, must be placed in the same directory as the opened file. >> >> The application will then load the malicious dll instead of the >> >> original, thus executing the malicious code. >> >> The following application loads external libraries following an >> insufficiently qualified path. >> >> Application: wscript.exe >> >> Extensions: js, jse, vbe, vbs, wsf, wsh >> >> Library: wshesn.dll >> >> Exploit: >> >> Option 1 - Using the “msfpayload” Metasploit module as shown below: >> >> msfpayload windows/exec CMD=calc.exe D > exploit.dll >> >> Option 2 - Using the “webdav_dll_hijacker” Metasploit module. >> >> Impact: >> >> A successful exploit of this vulnerability leads to arbitrary code >> execution. >> >> Vendor Response: >> >> 2011/08/09 – Vulnerability was identified. >> >> 2011/08/19 – Cybsec sent detailed information on the issue and a Proof of >> Concept. >> >> 2011/08/19 – Vendor stated: “As a matter of policy, we cannot comment on >> ongoing investigations”. >> >> 2011/08/19 – Vendor was informed that the security advisory would be >> published after 15 days. >> >> 2011/09/02 – Vulnerability was released. >> >> Contact Information: >> >> For more information regarding the vulnerability feel free to contact the >> researcher at >> >> jmgarcia <at> cybsec <dot> com >> >> About CYBSEC S.A. Security Systems >> >> Since 1996, >> CYBSEC is engaged exclusively in rendering professional services >> specialized in >> >> Information Security. Their area of services covers Latin America, Spain >> and over 250 customers are a >> >> proof of their professional life. >> >> To keep objectivity, CYBSEC S.A. does not represent, neither sell, nor is >> associated with other >> >> software and/or hardware provider companies. >> >> Our services are strictly focused on Information Security, protecting our >> clients from emerging security >> >> threats, maintaining their IT deployments available, safe, and reliable. >> >> Beyond professional services, CYBSEC is continuously researching new >> defense and attack techniques >> >> and contributing with the security community with high quality information >> exchange. >> >> For more information, please visit www.cybsec.com >> >> (c) 2011 - CYBSEC S.A. Security Systems >> >> _______________________________________________ >> Full-Disclosure - We believe in it. >> Charter: http://lists.grok.org.uk/full-disclosure-charter.html >> Hosted and sponsored by Secunia - http://secunia.com/ >> > > > > > > _______________________________________________ > Full-Disclosure - We believe in it. > Charter: http://lists.grok.org.uk/full-disclosure-charter.html > Hosted and sponsored by Secunia - http://secunia.com/ _______________________________________________ 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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