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CVE-2019-18277

HIGH

7.5

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).

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published10/23/2019

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

haproxy:haproxy

Weaknesses (CWE)

CWE-444

References

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00016.html(cve@mitre.org)

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00019.html(cve@mitre.org)

https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=196a7df44d8129d1adc795da020b722614d6a581(cve@mitre.org)

https://lists.debian.org/debian-lts-announce/2022/05/msg00045.html(cve@mitre.org)

https://nathandavison.com/blog/haproxy-http-request-smuggling(cve@mitre.org)

https://usn.ubuntu.com/4174-1/(cve@mitre.org)

https://www.mail-archive.com/haproxy%40formilux.org/msg34926.html(cve@mitre.org)

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00016.html(af854a3a-2127-422b-91ae-364da2661108)

http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00019.html(af854a3a-2127-422b-91ae-364da2661108)

https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=196a7df44d8129d1adc795da020b722614d6a581(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2022/05/msg00045.html(af854a3a-2127-422b-91ae-364da2661108)

https://nathandavison.com/blog/haproxy-http-request-smuggling(af854a3a-2127-422b-91ae-364da2661108)

https://usn.ubuntu.com/4174-1/(af854a3a-2127-422b-91ae-364da2661108)

https://www.mail-archive.com/haproxy%40formilux.org/msg34926.html(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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