HTTP Request Smuggling Affecting squid package, versions <4.13-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.15% (53rd percentile)

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  • Snyk IDSNYK-DEBIAN13-SQUID-5696207
  • published24 Aug 2020
  • disclosed2 Sept 2020

Introduced: 24 Aug 2020

CVE-2020-15811  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade Debian:13 squid to version 4.13-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream squid package and not the squid package as distributed by Debian. See How to fix? for Debian:13 relevant fixed versions and status.

An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.

CVSS Scores

version 3.1