CWE-62 UNIX硬链接
UNIX Hard Link
结构: Simple
Abstraction: Variant
状态: Incomplete
被利用可能性: unkown
基本描述
The software, when opening a file or directory, does not sufficiently account for when the name is associated with a hard link to a target that is outside of the intended control sphere. This could allow an attacker to cause the software to operate on unauthorized files.
扩展描述
Failure for a system to check for hard links can result in vulnerability to different types of attacks. For example, an attacker can escalate their privileges if a file used by a privileged program is replaced with a hard link to a sensitive file (e.g. /etc/passwd). When the process opens the file, the attacker can assume the privileges of that process.
相关缺陷
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cwe_Nature: ChildOf cwe_CWE_ID: 59 cwe_View_ID: 1000 cwe_Ordinal: Primary
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cwe_Nature: ChildOf cwe_CWE_ID: 59 cwe_View_ID: 699 cwe_Ordinal: Primary
适用平台
Language: {'cwe_Class': 'Language-Independent', 'cwe_Prevalence': 'Undetermined'}
Operating_System: {'cwe_Class': 'Unix', 'cwe_Prevalence': 'Undetermined'}
常见的影响
| 范围 | 影响 | 注释 |
|---|---|---|
| ['Confidentiality', 'Integrity'] | ['Read Files or Directories', 'Modify Files or Directories'] |
可能的缓解方案
MIT-48.1 Architecture and Design
策略: Separation of Privilege
Follow the principle of least privilege when assigning access rights to entities in a software system. Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
分析过的案例
| 标识 | 说明 | 链接 |
|---|---|---|
| CVE-2001-1494 | Hard link attack, file overwrite; interesting because program checks against soft links | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-1494 |
| CVE-2002-0793 | Hard link and possibly symbolic link following vulnerabilities in embedded operating system allow local users to overwrite arbitrary files. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-0793 |
| CVE-2003-0578 | Server creates hard links and unlinks files as root, which allows local users to gain privileges by deleting and overwriting arbitrary files. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0578 |
| CVE-1999-0783 | Operating system allows local users to conduct a denial of service by creating a hard link from a device special file to a file on an NFS file system. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0783 |
| CVE-2004-1603 | Web hosting manager follows hard links, which allows local users to read or modify arbitrary files. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1603 |
| CVE-2004-1901 | Package listing system allows local users to overwrite arbitrary files via a hard link attack on the lockfiles. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1901 |
| CVE-2005-0342 | The Finder in Mac OS X and earlier allows local users to overwrite arbitrary files and gain privileges by creating a hard link from the .DS_Store file to an arbitrary file. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0342 |
| CVE-2005-1111 | Hard link race condition | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-1111 |
| BUGTRAQ:20030203 ASA-0001 | OpenBSD chpass/chfn/chsh file content leak | http://www.securityfocus.com/archive/1/309962 |
Notes
分类映射
| 映射的分类名 | ImNode ID | Fit | Mapped Node Name |
|---|---|---|---|
| PLOVER | UNIX hard link | ||
| CERT C Secure Coding | FIO05-C | Identify files using multiple file attributes | |
| Software Fault Patterns | SFP18 | Link in resource name resolution |