CVE-2019-18277

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 v3.0 7.5 HIGH
CVSS v2.0 4.3 MEDIUM

7.5^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

4.3^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:N/I:P/A:N

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://git.haproxy.org/?p=haproxy-2.0.git;a=commit;h=196a7df44d8129d1adc795da020b722614d6a581	Patch Vendor Advisory
https://www.mail-archive.com/haproxy@formilux.org/msg34926.html	Release Notes
https://nathandavison.com/blog/haproxy-http-request-smuggling	Exploit Third Party Advisory
https://usn.ubuntu.com/4174-1/
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00019.html
https://lists.debian.org/debian-lts-announce/2022/05/msg00045.html

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Configurations

Configuration 1 (hide)

cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*

Information

Published : 2019-10-23 07:15

Updated : 2022-06-02 07:15

NVD link : CVE-2019-18277

Mitre link : CVE-2019-18277

JSON object : View

CWE

CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

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Products Affected

haproxy

haproxy

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