HTTP Request Smuggling Affecting haproxy package, versions <1.8.8-1ubuntu0.7


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

Exploit Maturity
Not Defined
EPSS
1.43% (87th percentile)

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  • Snyk IDSNYK-UBUNTU1804-HAPROXY-475146
  • published24 Oct 2019
  • disclosed23 Oct 2019

Introduced: 23 Oct 2019

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

How to fix?

Upgrade Ubuntu:18.04 haproxy to version 1.8.8-1ubuntu0.7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream haproxy package and not the haproxy package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 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