Vulnerabilities > CVE-2013-3661 - Path Traversal vulnerability in Microsoft products
Attack vector
LOCAL Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
COMPLETE Summary
The EPATHOBJ::bFlatten function in win32k.sys in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows Server 2012, and Windows RT does not check whether linked-list traversal is continually accessing the same list member, which allows local users to cause a denial of service (infinite traversal) via vectors that trigger a crafted PATHRECORD chain.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| OS | 12 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Relative Path Traversal An attacker exploits a weakness in input validation on the target by supplying a specially constructed path utilizing dot and slash characters for the purpose of obtaining access to arbitrary files or resources. An attacker modifies a known path on the target in order to reach material that is not available through intended channels. These attacks normally involve adding additional path separators (/ or \) and/or dots (.), or encodings thereof, in various combinations in order to reach parent directories or entirely separate trees of the target's directory structure.
- Directory Traversal An attacker with access to file system resources, either directly or via application logic, will use various file path specification or navigation mechanisms such as ".." in path strings and absolute paths to extend their range of access to inappropriate areas of the file system. The attacker attempts to either explore the file system for recon purposes or access directories and files that are intended to be restricted from their access. Exploring the file system can be achieved through constructing paths presented to directory listing programs, such as "ls" and 'dir', or through specially crafted programs that attempt to explore the file system. The attacker engaging in this type of activity is searching for information that can be used later in a more exploitive attack. Access to restricted directories or files can be achieved through modification of path references utilized by system applications.
- File System Function Injection, Content Based An attack of this type exploits the host's trust in executing remote content including binary files. The files are poisoned with a malicious payload (targeting the file systems accessible by the target software) by the attacker and may be passed through standard channels such as via email, and standard web content like PDF and multimedia files. The attacker exploits known vulnerabilities or handling routines in the target processes. Vulnerabilities of this type have been found in a wide variety of commercial applications from Microsoft Office to Adobe Acrobat and Apple Safari web browser. When the attacker knows the standard handling routines and can identify vulnerabilities and entry points they can be exploited by otherwise seemingly normal content. Once the attack is executed, the attackers' program can access relative directories such as C:\Program Files or other standard system directories to launch further attacks. In a worst case scenario, these programs are combined with other propagation logic and work as a virus.
- Using Slashes and URL Encoding Combined to Bypass Validation Logic This attack targets the encoding of the URL combined with the encoding of the slash characters. An attacker can take advantage of the multiple way of encoding an URL and abuse the interpretation of the URL. An URL may contain special character that need special syntax handling in order to be interpreted. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). For instance US-ASCII space character would be represented with %20. This is often referred as escaped ending or percent-encoding. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc.
- Manipulating Input to File System Calls An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
Exploit-Db
description Win32k!EPATHOBJ::pprFlattenRec Uninitialized Next Pointer Testcase. CVE-2013-3130,CVE-2013-3660,CVE-2013-3661. Dos exploit for windows platform file exploits/windows/dos/25611.txt id EDB-ID:25611 last seen 2016-02-03 modified 2013-05-21 platform windows port published 2013-05-21 reporter Tavis Ormandy source https://www.exploit-db.com/download/25611/ title Win32k!EPATHOBJ::pprFlattenRec Uninitialized Next Pointer Testcase type dos description Windows NT/2K/XP/2K3/Vista/2K8/7/8 - EPATHOBJ Local Ring Exploit. CVE-2013-3130,CVE-2013-3660,CVE-2013-3661. Local exploit for windows platform id EDB-ID:25912 last seen 2016-02-03 modified 2013-06-03 published 2013-06-03 reporter Tavis Ormandy source https://www.exploit-db.com/download/25912/ title Windows NT/2K/XP/2K3/Vista/2K8/7/8 - EPATHOBJ Local Ring Exploit description Windows EPATHOBJ::pprFlattenRec Local Privilege Escalation. CVE-2013-3130,CVE-2013-3660,CVE-2013-3661. Local exploit for windows platform id EDB-ID:26554 last seen 2016-02-03 modified 2013-07-02 published 2013-07-02 reporter metasploit source https://www.exploit-db.com/download/26554/ title Windows EPATHOBJ::pprFlattenRec Local Privilege Escalation
Nessus
| NASL family | Windows |
| NASL id | SMB_NT_CVE-2013-3660.NASL |
| description | The Microsoft Windows host has a flaw in Win32k.sys which can be exploited by local users to gain elevated privileges or trigger a denial of service condition. The issue is due to a flaw in how linked list pointers are handled in PATHREC objects. |
| last seen | 2017-10-29 |
| modified | 2013-09-28 |
| plugin id | 66878 |
| published | 2013-06-12 |
| reporter | Tenable |
| source | https://www.tenable.com/plugins/index.php?view=single&id=66878 |
| title | Microsoft Windows Kernel Win32k.sys PATHRECORD chain Multiple Vulnerabilities |
| code | |
Seebug
| bulletinFamily | exploit |
| description | BUGTRAQ ID: 60159 CVE(CAN) ID: CVE-2013-3661 Microsoft Windows是微软公司推出的一系列操作系统。 Microsoft Windows XP SP2/SP3、Windows Server 2003 SP2、Windows Vista SP2、Windows Server 2008 SP2/R2 SP1、Windows 7 SP1、Windows 8、Windows Server 2012、Windows RT版本中，win32k.sys的函数EPATHOBJ::bFlatten没有检查链表遍历是否持续访问同一个列表成员，本地用户通过特制的PATHRECORD链可触发漏洞，造成拒绝服务。 0 Microsoft Windows Vista Microsoft Windows Server 2008 Microsoft Windows Server 2003 Microsoft Windows 8 Microsoft Windows 7 厂商补丁： Microsoft --------- 目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本： http://technet.microsoft.com/security/bulletin/ |
| id | SSV:60811 |
| last seen | 2017-11-19 |
| modified | 2013-05-30 |
| published | 2013-05-30 |
| reporter | Root |
| title | Microsoft Windows Kernel 'Win32k.sys'本地拒绝服务漏洞(CVE-2013-3661) |
References
- http://archives.neohapsis.com/archives/fulldisclosure/2013-05/0094.html
- http://archives.neohapsis.com/archives/fulldisclosure/2013-06/0006.html
- http://secunia.com/advisories/53435
- http://twitter.com/taviso/statuses/335557286657400832
- http://www.computerworld.com/s/article/9239477
- http://www.exploit-db.com/exploits/25611/
- http://www.osvdb.org/93539
- http://www.reddit.com/r/netsec/comments/1eqh66/0day_windows_kernel_epathobj_vulnerability/
- http://www.theverge.com/2013/5/23/4358400/google-engineer-bashes-microsoft-discloses-windows-flaw