CWE-37 路径遍历：'/absolute/pathname/here'

Path Traversal: '/absolute/pathname/here'

结构: Simple

Abstraction: Variant

状态: Draft

被利用可能性: unkown

基本描述

A software system that accepts input in the form of a slash absolute path ('/absolute/pathname/here') without appropriate validation can allow an attacker to traverse the file system to unintended locations or access arbitrary files.

相关缺陷

• cwe_Nature: ChildOf cwe_CWE_ID: 36 cwe_View_ID: 1000 cwe_Ordinal: Primary

• cwe_Nature: ChildOf cwe_CWE_ID: 36 cwe_View_ID: 699 cwe_Ordinal: Primary

• cwe_Nature: ChildOf cwe_CWE_ID: 160 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

MIT-5.1 Implementation

策略: Input Validation

Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a whitelist of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
Do not rely exclusively on looking for malicious or malformed inputs (i.e., do not rely on a blacklist). A blacklist is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, blacklists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
When validating filenames, use stringent whitelists that limit the character set to be used. If feasible, only allow a single "." character in the filename to avoid weaknesses such as CWE-23, and exclude directory separators such as "/" to avoid CWE-36. Use a whitelist of allowable file extensions, which will help to avoid CWE-434.
Do not rely exclusively on a filtering mechanism that removes potentially dangerous characters. This is equivalent to a blacklist, which may be incomplete (CWE-184). For example, filtering "/" is insufficient protection if the filesystem also supports the use of "" as a directory separator. Another possible error could occur when the filtering is applied in a way that still produces dangerous data (CWE-182). For example, if "../" sequences are removed from the ".../...//" string in a sequential fashion, two instances of "../" would be removed from the original string, but the remaining characters would still form the "../" string.

MIT-20 Implementation

策略: Input Validation

Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass whitelist validation schemes by introducing dangerous inputs after they have been checked.

分析过的案例

标识	说明	链接
CVE-2002-1345	Multiple FTP clients write arbitrary files via absolute paths in server responses	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1345
CVE-2001-1269	ZIP file extractor allows full path	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-1269
CVE-2002-1818	Path traversal using absolute pathname	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1818
CVE-2002-1913	Path traversal using absolute pathname	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1913
CVE-2005-2147	Path traversal using absolute pathname	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2147
CVE-2000-0614	Arbitrary files may be overwritten via compressed attachments that specify absolute path names for the decompressed output.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-0614

分类映射

映射的分类名	ImNode ID	Fit	Mapped Node Name
PLOVER			/absolute/pathname/here
CERT C Secure Coding	FIO05-C		Identify files using multiple file attributes
Software Fault Patterns	SFP16		Path Traversal

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