CWE-61 UNIX符号链接跟随
UNIX Symbolic Link (Symlink) Following
结构: Composite
Abstraction: Compound
状态: Incomplete
被利用可能性: High
基本描述
The software, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the software to operate on unauthorized files.
扩展描述
A software system that allows UNIX symbolic links (symlink) as part of paths whether in internal code or through user input can allow an attacker to spoof the symbolic link and traverse the file system to unintended locations or access arbitrary files. The symbolic link can permit an attacker to read/write/corrupt a file that they originally did not have permissions to access.
相关缺陷
-
cwe_Nature: ChildOf cwe_CWE_ID: 59 cwe_View_ID: 1000 cwe_Ordinal: Primary
-
cwe_Nature: ChildOf cwe_CWE_ID: 59 cwe_View_ID: 699 cwe_Ordinal: Primary
-
cwe_Nature: Requires cwe_CWE_ID: 362 cwe_View_ID: 1000
-
cwe_Nature: Requires cwe_CWE_ID: 340 cwe_View_ID: 1000
-
cwe_Nature: Requires cwe_CWE_ID: 216 cwe_View_ID: 1000
-
cwe_Nature: Requires cwe_CWE_ID: 386 cwe_View_ID: 1000
-
cwe_Nature: Requires cwe_CWE_ID: 732 cwe_View_ID: 1000
适用平台
Language: {'cwe_Class': 'Language-Independent', '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
Implementation
策略:
Symbolic link attacks often occur when a program creates a tmp directory that stores files/links. Access to the directory should be restricted to the program as to prevent attackers from manipulating the files.
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-1999-1386 | Some versions of Perl follows symbolic links when running with the -e option, which allows local users to overwrite arbitrary files via a symlink attack. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-1386 |
| CVE-2000-1178 | Text editor follows symbolic links when creating a rescue copy during an abnormal exit, which allows local users to overwrite the files of other users. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-1178 |
| CVE-2004-0217 | Antivirus update allows local users to create or append to arbitrary files via a symlink attack on a logfile. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0217 |
| CVE-2003-0517 | Symlink attack allows local users to overwrite files. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0517 |
| CVE-2004-0689 | Possible interesting example | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0689 |
| CVE-2005-1879 | Second-order symlink vulnerabilities | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-1879 |
| CVE-2005-1880 | Second-order symlink vulnerabilities | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-1880 |
| CVE-2005-1916 | Symlink in Python program | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-1916 |
| CVE-2000-0972 | Setuid product allows file reading by replacing a file being edited with a symlink to the targeted file, leaking the result in error messages when parsing fails. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-0972 |
| CVE-2005-0824 | Signal causes a dump that follows symlinks. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0824 |
Notes
分类映射
| 映射的分类名 | ImNode ID | Fit | Mapped Node Name |
|---|---|---|---|
| PLOVER | UNIX symbolic link following |
相关攻击模式
- CAPEC-27
引用
文章来源于互联网:scap中文网
- 左青龙
- 微信扫一扫
-
- 右白虎
- 微信扫一扫
-
评论