CVE-2019-18277

 

Published at: - 23-10-2019 04:15

Last modified: - 02-06-2022 04:15

Total changes: - 2

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).

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://git.haproxy.org/?p=haproxy-2.0.git;a=commit;h=196a7df44d8129d1adc795da020b722614d6a581
• https://www.mail-archive.com/haproxy@formilux.org/msg34926.html
• https://nathandavison.com/blog/haproxy-http-request-smuggling
• USN-4174-1-
• openSUSE-SU-2019:2626-
• openSUSE-SU-2019:2645-
• [debian-lts-announce] 20220530 [SECURITY] [DLA 3034-1] haproxy security update-

 

Keywords

NVD

 

CVE-2019-18277

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures