Google Chrome < 14.0.835.163 PDF File Handling Memory Corruption

Credit: Mario Gomes
Risk: Low
Local: No
Remote: No

CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

----------------Security Adisory---------------- Title: Google Chrome < 14.0.835.163 PDF File Handling Memory Corruption Vulnerability (CVE-2011-2841) Sec-Security: Hich CVE-Number: CVE-2011-2841 Date of discovery: 04/06/2011(MM/DD/YYYY) Fix date: 06/28/2011(MM/DD/YYYY) Fixed Version: Google Chrome >= 14.0.835.163 Discovered by: Mario Gomes ----------------Summary---------------- Google Chrome is a web browser developed by Google that uses the WebKit layout engine. It was first released as a beta version for Microsoft Windows on September 2, 2008, and the public stable release was on December 11, 2008. The name is derived from the graphical user interface frame, or "chrome", of web browsers. As of August 2011, Chrome is the third most widely used browser with 23.16% worldwide usage share of web browsers, according to StatCounter.(From Wikipedia) ----------------Description---------------- Google Chrome suffers from a memory corruption vulnerability that occurs in the manipulation of PDF files. The failure occurs when the browser opens an HTML file that contains multiple tag <IFRAME> pointing to a PDF file. So it is a memory corruption flaw allows code to run within the sandbox. ----------------Stacktrace---------------- This stracktrace shows a clear memory corruption, because I do not have the symbols of Google's PDF viewer can not give more details. (648.41c): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=049c4000 ebx=0000efee ecx=049bc7a0 edx=841d63b9 esi=00000000 edi=049bf000 eip=6f3f9332 esp=002feaa0 ebp=002feac4 iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210206 *** ERROR: Symbol file could not be found. Defaulted to export symbols for D:\Users\Cassio\AppData\Local\Google\Chrome\Application\12.0.742.91\pdf.dll - pdf!PPP_GetInterface+0x17be62: 6f3f9332 8b08 mov ecx,dword ptr [eax] ds:0023:049c4000=???????? Stacktrace: pdf!PPP_GetInterface+0x17be62 pdf!PPP_GetInterface+0x17430f pdf!PPP_GetInterface+0x172fe1 pdf!PPP_GetInterface+0x28d40 pdf!PPP_GetInterface+0x11db6 pdf!GetPDFDocInfo+0x1944f pdf!GetPDFDocInfo+0x18cce pdf!GetPDFDocInfo+0x1868c pdf!GetPDFDocInfo+0x85ae pdf!GetPDFDocInfo+0x4432 pdf+0x64d0 pdf!GetPDFDocInfo+0x6f42 pdf!GetPDFDocInfo+0x6d0e pdf!GetPDFDocInfo+0x49e0 pdf!GetPDFDocInfo+0x37be pdf!GetPDFDocInfo+0x3792 pdf!GetPDFDocInfo+0x3db1 chrome_63700000!WebCore::DocumentLoader::finishedLoading+0x31 chrome_63700000!WebCore::FrameLoader::finishedLoading+0x26 chrome_63700000!WebCore::MainResourceLoader::didFinishLoading+0x5c chrome_63700000!WebCore::ResourceLoader::didFinishLoading+0xe chrome_63700000!WebCore::ResourceHandleInternal::didFinishLoading+0x35 chrome_63700000!webkit_glue::WebURLLoaderImpl::Context::OnCompletedRequest+0x10c chrome_63700000!ResourceDispatcher::OnRequestComplete+0x43 chrome_63700000!IPC::MessageWithTuple<Tuple4<int,net::URLRequestStatus,std::basic_string<char,std::char_traits<char>,std::alloc+0x4d chrome_63700000!ResourceDispatcher::DispatchMessageW+0x4f chrome_63700000!ResourceDispatcher::OnMessageReceived+0xbb chrome_63700000!ChildThread::OnMessageReceived+0x1b chrome_63700000!RunnableMethod<notifier::MediatorThreadImpl::Core,void (__thiscall notifier::MediatorThreadImpl::Core::*)(std::+0x17 chrome_63700000!MessageLoop::RunTask+0x7d chrome_63700000!MessageLoop::DeferOrRunPendingTask+0x28 chrome_63700000!MessageLoop::DoWork+0x71 chrome_63700000!base::MessagePumpDefault::Run+0xc2 chrome_63700000!MessageLoop::RunInternal+0x31 chrome_63700000!MessageLoop::RunHandler+0x17 chrome_63700000!MessageLoop::Run+0x15 chrome_63700000!RendererMain+0x309 chrome_63700000!ChromeMain+0x653 chrome!MainDllLoader::Launch+0xf0 chrome!wWinMain+0xef chrome!__tmainCRTStartup+0x112 kernel32!BaseThreadInitThunk+0xe ntdll!__RtlUserThreadStart+0x70 ntdll!_RtlUserThreadStart+0x1b ----------------Tested On---------------- Microsoft Windows XP Professional Service Pack 3 (Brazilian Portuguese) ----------------Proof-of-concept---------------- Poc in HTML File: The PDF file needed can be found here: Download both files here: ----------------Steps to Reproduce---------------- 1. Create the file poc.html with this code 2. Download the PDF file here and save in same folder 3. Open the poc.html with fw4.pdf in same folder. ----------------Vulnerability Timeline(MM/DD/YYYY)---------------- [04/06/2011] Vulnerability is discovered and sent to the vendor. [04/06/2011] The Google security team confirm the vulnerability and updates the status. [06/13/2011] More information about the vulnerability is sent. [07/28/2011] Vulnerability is fixed and the vendor announces the launch of the patch is version 14. [09/16/2011] The vendor released version 14 with the flaw fixed. [10/03/2011] Coordinated public security advisory released. ----------------References---------------- Google Release Notes Post( CVE Number( Chromium Bug Tracker Bug Id( Vulnerability Blog Post( ----------------Vulnerability Credits---------------- Mario Gomes Security Researcher and Pen-tester, Goiania - GO, Brazil Blog Contact ----------------End of Advisory----------------

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