CVE-2019-18277

CVE Database · CVE-2019-18277

CVE-2019-18277

· HIGHModified

CVSS v3.1

7.5

EPSS

10.02%

Published

Oct 23, 2019

Modified

Nov 21, 2024

Public PoC / Exploit (1)

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Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

Description

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 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weaknesses (CWE)

CWE-444

Affected Products (1)

haproxy · haproxy (up to 2.0.6)vulnerable

References (14)

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00016.html

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00019.html

https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=196a7df44d8129d1adc795da020b722614d6a581

https://lists.debian.org/debian-lts-announce/2022/05/msg00045.html

https://nathandavison.com/blog/haproxy-http-request-smuggling

ExploitThird Party Advisory

https://usn.ubuntu.com/4174-1/

https://www.mail-archive.com/haproxy%40formilux.org/msg34926.html

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00016.html

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00019.html

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