HTTP Request Smuggling Affecting python2.7 package, versions <2.7.13-2+deb9u5



    Attack Complexity High
    User Interaction Required
    Availability High
Expand this section
5.9 medium
Expand this section
5.9 medium
Expand this section
Red Hat
5.9 medium

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  • Snyk ID SNYK-DEBIAN9-PYTHON27-1085862
  • published 16 Feb 2021
  • disclosed 15 Feb 2021

How to fix?

Upgrade Debian:9 python2.7 to version 2.7.13-2+deb9u5 or higher.

NVD Description

Note: Versions mentioned in the description apply to the upstream python2.7 package. See How to fix? for Debian:9 relevant versions.

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.