CWE-177 URL编码处理不恰当(Hex编码)

Improper Handling of URL Encoding (Hex Encoding)

结构: Simple

Abstraction: Variant

状态: Draft

被利用可能性: unkown


The software does not properly handle when all or part of an input has been URL encoded.


  • cwe_Nature: ChildOf cwe_CWE_ID: 172 cwe_View_ID: 1000 cwe_Ordinal: Primary

  • cwe_Nature: ChildOf cwe_CWE_ID: 172 cwe_View_ID: 699 cwe_Ordinal: Primary


Language: {'cwe_Class': 'Language-Independent', 'cwe_Prevalence': 'Undetermined'}


范围 影响 注释
Integrity Unexpected State


MIT-44 Architecture and Design

策略: Input Validation

Avoid making decisions based on names of resources (e.g. files) if those resources can have alternate names.

MIT-5 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.

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.


标识 说明 链接
CVE-2000-0900 Hex-encoded path traversal variants - "%2e%2e", "%2e%2e%2f", "%5c%2e%2e"
CVE-2005-2256 Hex-encoded path traversal variants - "%2e%2e", "%2e%2e%2f", "%5c%2e%2e"
CVE-2004-2121 Hex-encoded path traversal variants - "%2e%2e", "%2e%2e%2f", "%5c%2e%2e"
CVE-2004-0280 "%20" (encoded space)
CVE-2003-0424 "%20" (encoded space)
CVE-2001-0693 "%20" (encoded space)
CVE-2001-0778 "%20" (encoded space)
CVE-2002-1831 Crash via hex-encoded space "%20".
CVE-2000-0671 "%00" (encoded null)
CVE-2004-0189 "%00" (encoded null)
CVE-2002-1291 "%00" (encoded null)
CVE-2002-1031 "%00" (encoded null)
CVE-2001-1140 "%00" (encoded null)
CVE-2004-0760 "%00" (encoded null)
CVE-2002-1025 "%00" (encoded null)
CVE-2002-1213 "%2f" (encoded slash)
CVE-2004-0072 "%5c" (encoded backslash) and "%2e" (encoded dot) sequences
CVE-2004-0847 "%5c" (encoded backslash)
CVE-2002-1575 "%0a" (overlaps CRLF)


映射的分类名 ImNode ID Fit Mapped Node Name
PLOVER URL Encoding (Hex Encoding)


  • CAPEC-120
  • CAPEC-468
  • CAPEC-64
  • CAPEC-72