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CVE-2019-18277

Published: 23 October 2019

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).

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
haproxy
Launchpad, Ubuntu, Debian
bionic
Released (1.8.8-1ubuntu0.7)
disco
Released (1.8.19-1ubuntu1.2)
eoan
Released (2.0.5-1ubuntu0.2)
trusty Does not exist

upstream
Released (2.0.6-1)
xenial
Released (1.6.3-1ubuntu0.3)
Patches:
upstream: https://git.haproxy.org/?p=haproxy-2.0.git;a=commit;h=196a7df44d8129d1adc795da020b722614d6a581

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N