HTTP Request Smuggling

Affecting python3.5 package, versions <3.5.3-1+deb9u4

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Overview

Affected versions of this package are vulnerable to HTTP Request Smuggling. 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.

Remediation

Upgrade python3.5 to version or higher.

References

CVSS Score

5.9
medium severity
  • Attack Vector
    Network
  • Attack Complexity
    High
  • Privileges Required
    None
  • User Interaction
    Required
  • Scope
    Unchanged
  • Confidentiality
    None
  • Integrity
    Low
  • Availability
    High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H
CVE
CVE-2021-23336
CWE
CWE-444
Snyk ID
SNYK-DEBIAN9-PYTHON35-1075119
Disclosed
15 Feb, 2021
Published
16 Feb, 2021