CVE Vulnerability

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).

4.3 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

7.5 /10

CVSS v3.0 : HIGH

V3 Legend

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

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
Configurations

Configuration 1

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

Published : 2019-10-23 02:15

Updated : 2022-06-02 02:15

NVD link : CVE-2019-18277

Mitre link : CVE-2019-18277

Products Affected
No products.
CWE
CWE-444

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