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CVE PROGRAM SOURCE RECORD5.9 Medium

CVE-2021-23336

Web Cache Poisoning

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Status
Published
Published
Updated
Assigning organization
snyk

Description

The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

n/a python/cpython

  • 0 to < unspecifiedaffected
  • unspecified to < 3.6.13affected
  • 3.7.0 to < unspecifiedaffected
  • unspecified to < 3.7.10affected
  • 3.8.0 to < unspecifiedaffected
  • unspecified to < 3.8.8affected
  • 3.9.0 to < unspecifiedaffected
  • unspecified to < 3.9.2affected

References