high
7.5
CWE
444
Advisory Published
CVE Published
CVE Published
Updated

CVE-2019-18277

First published: Tue Oct 08 2019(Updated: )

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).

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Haproxy Haproxy<2.0.6
redhat/haproxy<2.0.6
2.0.6
redhat/haproxy<1.8.22
1.8.22
ubuntu/haproxy<1.8.8-1ubuntu0.7
1.8.8-1ubuntu0.7
ubuntu/haproxy<1.8.19-1ubuntu1.2
1.8.19-1ubuntu1.2
ubuntu/haproxy<2.0.5-1ubuntu0.2
2.0.5-1ubuntu0.2
ubuntu/haproxy<2.0.6-1
2.0.6-1
ubuntu/haproxy<1.6.3-1ubuntu0.3
1.6.3-1ubuntu0.3
debian/haproxy
2.2.9-2+deb11u6
2.6.12-1+deb12u1
2.9.10-1

Remedy

https://git.haproxy.org/?p=haproxy-2.0.git;a=commit;h=196a7df44d8129d1adc795da020b722614d6a581

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the vulnerability ID for this flaw in HAProxy?

    The vulnerability ID for this flaw in HAProxy is CVE-2019-18277.

  • What is the severity level of CVE-2019-18277?

    The severity level of CVE-2019-18277 is high with a severity value of 7.5.

  • What is the impact of CVE-2019-18277?

    The impact of CVE-2019-18277 is limited but can be used to help construct an HTTP request smuggling attack.

  • Which versions of HAProxy are affected by this vulnerability?

    HAProxy versions before 2.0.6 and versions before 1.8.22 are affected by this vulnerability.

  • How can I fix CVE-2019-18277 in HAProxy?

    To fix CVE-2019-18277, it is recommended to update HAProxy to version 2.0.6 or version 1.8.22.

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