HTTP Request Smuggling Affecting haproxy package, versions <0:1.8.23-3.el8


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
1.43% (87th percentile)

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  • Snyk IDSNYK-RHEL8-HAPROXY-3696400
  • published26 Jul 2021
  • disclosed13 Sept 2019

Introduced: 13 Sep 2019

CVE-2019-18277  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade RHEL:8 haproxy to version 0:1.8.23-3.el8 or higher.
This issue was patched in RHSA-2020:1725.

NVD Description

Note: Versions mentioned in the description apply only to the upstream haproxy package and not the haproxy package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).

CVSS Scores

version 3.1