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Home  Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). Confidence 2013 5% Off any SANS course Use Code: SecuriTeam_5 Hack In Paris La Nuit du Hack Subjects of Interest: Vulnerability Management SQL Injection Buffer Overflows Active Network Scanning Fuzzing Fuzzer Report Network Security Network Scanner Pen Testing Security Scanner	Microsoft Windows XP/2003 Macrovision SecDrv.sys Privilege Escalation 18 Oct. 2007    Summary Symantec researcher Elia Florip has warned, at the company's weblog of a 0day attack in Windows XP and 2003 that allows unprivileged users to gain SYSTEM privileges via a buggy driver installed by default. The following advisory sheds light on the issue and reveals where the problem is.   Credit: The information has been provided by Reversemode. The original article can be found at: http://www.reversemode.com/index.php?option=com_mamblog&Itemid=15&task=show&action=view&id=43&Itemid=15 Free Website Security Scan Free Fuzzer Report Vulnerability Assessment Detect web app vulnerabilities University study comparing the top Accurate and automated scanning Get guidance from professionals. 6 commercially availble fuzzers. for networks of any size.    Details Protect your website! Free Trial, Nothing to install. No interruption of visitors. www.beyondsecurity.com/vulnerability-scanner In Elia Florip's post, Elia brings us an important clue:"At the moment, it's still not clear how the driver is used by Windows because this file does not have the typical Microsoft file properties present in other Windows system files". Such a file it is not common so looking for this sort of .sys we come across a couple of them. One of those drivers is *secdrv.sys*, which is developed by Macrovision as part of SafeDisc. Mario Ballano (48bits.com) and I we have been taking a look at the driver and quickly found this interesting piece of code. .text:00015E2C cmp [ebp+var_10], 0CA002813h .text:00015E33 jz short loc_15E69 As you can see the IOCTL is METHOD_NEITHER which is a potential vulnerability by itself (few drivers are correctly handling this method). Let's see whether this time is different... .text:00015ED9 call dword ptr [eax+10h] ; Internal Dispatcher .text:00015EDC mov [ebp+var_1C], eax .text:00015EDF cmp [ebp+var_1C], 0Ah .text:00015EE3 jz short loc_15EFC .text:00015EE5 mov eax, [ebp+arg_4] .text:00015EE8 mov dword ptr [eax], 0C0000001h .text:00015EEE mov eax, [ebp+arg_4] .text:00015EF1 and dword ptr [eax+4], 0 .text:00015EF5 mov eax, 0C0000001h .text:00015EFA jmp short loc_15F21 .text:00015EFC ; --------------------------------------------------------------------------- .text:00015EFC .text:00015EFC loc_15EFC: ; CODE XREF: sub_15E12+D1j .text:00015EFC mov ecx, [ebp+var_4] .text:00015EFF mov esi, [ebp+var_C] .text:00015F02 mov eax, [ebp+arg_0] .text:00015F05 mov edi, [eax+3Ch] ; Input Buffer .text:00015F08 mov eax, ecx ; Inline memcpy .text:00015F0A shr ecx, 2 .text:00015F0D rep movsd .text:00015F0F mov ecx, eax .text:00015F11 and ecx, 3 .text:00015F14 rep movsb No luck. As you can see the buffer supplied by the user is not properly checked so you can overwrite any address you wish, even kernel addresses. Anyway, this piece of code is not very comfortable for developing the exploit since it is overwriting the same buffer that is used as input vector. The ideal situation would be bytes being copied from the input buffer into the output buffer. Surprise, surprise... --------------------------------------------------------------------------- .text:00015EFC .text:00015EFC loc_15EFC: ; CODE XREF: sub_15E12+D1j .text:00015EFC mov ecx, [ebp+var_4] .text:00015EFF mov esi, [ebp+var_C] ; Input Buffer .text:00015F02 mov eax, [ebp+arg_0] .text:00015F05 mov edi, [eax+3Ch] ; Output Buffer (Irp->UserBuffer) .text:00015F08 mov eax, ecx ; Inline memcpy .text:00015F0A shr ecx, 2 .text:00015F0D rep movsd .text:00015F0F mov ecx, eax .text:00015F11 and ecx, 3 .text:00015F14 rep movsb The first 4 DWORDs of the input buffer are copied into the output buffer without any further validation. However,there is a restriction: InputBuffer[1] should be a fixed value in order to reach this piece of code. No problem. Take a look at the exploit code. Reversemode has released a K-plugin for kartoffel that exploits this flaw on Windows XP SP2 and 2003 (32-bit). Download at http://kartoffel.reversemode.com/downloads.php.  * This K-plugin can only be used for personal study and research purposes. Do not email me requesting shellcodes, customized exploit or something like that * References: [1] http://www.symantec.com/enterprise/security_response/weblog/2007/10/privilege_escalation_exploit_i.html [2] http://www.macrovision.com [3] http://www.reversemode.com/index.php?option=com_mamblog&Itemid=15&task=show&action=view&id=43&Itemid=15 [4] http://blog.48bits.com/?p=172 (castilian) Despite there is no patch available, at the moment, we are disclosing this information since an exploit has been caught in the wild so we see no reason to hide information that can be useful for administrators and researchers.  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles Microsoft Visio Viewer Tree Object Type Confusion Visio File Handling Arbitrary Execution Vulnerability Microsoft Windows Modern Mail Spoofing Weakness Vulnerability Microsoft SharePoint Callback Function URL Handling Privilege Escalation Vulnerability Microsoft IE CCaret Use-after-free Arbitrary Code Execution Vulnerability Microsoft Windows 8 TrueType Font (TTF) Handling DoS Vulnerability Microsoft IE OnResize Use-After-Free Arbitrary Code Execution Vulnerability Microsoft Windows USB Driver Memory Object Handling Local Privilege (2013-1287) Vulnerability Microsoft IE SaveHistory Onload Event Handling Use-After-Free Arbitrary Code Execution Vulnerability Microsoft IE CMarkupBehaviorContext Use-After-Free Arbitrary Code Execution Vulnerability Microsoft SharePoint XSS Vulnerability Microsoft IE OnBeforeCopy Use-After-Free Arbitrary Code Execution Vulnerability Microsoft Windows USB Driver Memory Object Handling Local Privilege Escalation Vulnerability Microsoft OneNote Buffer Size Validation ONE File Handling Information Disclosure Vulnerability Microsoft IE GetMarkupPtr execCommand Print Event Handling Use-after-free Execution Vulnerability Microsoft SharePoint Remote Overflow DoS Vulnerability Microsoft IE CTreeNode Use-After-Free Arbitrary Code Execution Vulnerability Microsoft Windows USB Driver Memory Object Handling Local Privilege (2013-1286) Vulnerability Microsoft IE CTreeNode Use-After-Free Use-After-Free Arbitrary Execution Vulnerability Microsoft IE Proxy Server TCP Session Re-Use Cross-User Information Disclosure Weakness Vulnerability Microsoft IE Shift JIS Character Encoding Information Disclosure Vulnerability  Featured Articles Microsoft SharePoint Callback Function URL Handling Privilege Escalation Vulnerability Microsoft Windows USB Driver Memory Object Handling Local Privilege (2013-1287) Vulnerability Microsoft Windows USB Driver Memory Object Handling Local Privilege Escalation Vulnerability Microsoft Windows Kernel Memory Object Handling Local Privilege Escalation Vulnerability Microsoft Windows SSL/TSL Forced Downgrade MitM Weakness Microsoft Windows Memory Object Handling Local Memory Privilege Escalation Vulnerability Microsoft Windows Privilege Escalation Vulnerability Microsoft .NET Framework Serialization Remote Code Execution Vulnerability Microsoft Visio Viewer VSD File Format Remote Code Execution Vulnerability Microsoft .NET Framework Input Serialization CVE-2012-0160 Remote Code Execution Vulnerability Microsoft .NET Framework ASP.NET Forms Authentication Bypass Vulnerability 'TrendMicro Control Manager CASProcessor.exe BLOB Code Execution Vulnerability' 'HP iNode Management Center iNodeMngChecker.exe Code Execution Vulnerability' 'HP Data Protector Backup Client Service EXEC_SCRIPT Code Execution Vulnerability' 'Microsoft Internet Explorer Property Change Memory Corruption Vulnerability' 'Microsoft Office PowerPoint PersistDirectoryEntry Code Execution Vulnerability' 'CA Total Defense Suite Heartbeat Web Service Code Execution Vulnerability' 'HP Web Jetadmin Unauthorized Access to Managed Resources Vulnerability' 'Novell Zenworks Handheld Management ZfHIPCnd.exe Opcode 2 Code Execution Vulnerability' 'Microsoft Windows Shell Graphics biCompression Buffer Overflow Vulnerability'
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