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Ubuntu update for HAproxy

Published: 2019-11-07
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-18277
Exploitation vector Network
Public exploit N/A
Vulnerable software
haproxy (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Inconsistent interpretation of HTTP requests

Severity: Medium

CVSSv3: 5.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-18277

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No


The vulnerability allows a remote attacker to perform HTTP request smuggling attack.

The vulnerability exists due to incorrect processing of messages with a missing transfer-encoding header, when HAProxy is configured in legacy mode. The server does not reject "chunked" value that combined with the "http-reuse always" setting can lead to HTTP request smuggling attack.


Update the affected packages.

Ubuntu 19.10
haproxy - 2.0.5-1ubuntu0.2
Ubuntu 19.04
haproxy - 1.8.19-1ubuntu1.2
Ubuntu 18.04 LTS
haproxy - 1.8.8-1ubuntu0.7
Ubuntu 16.04 LTS
haproxy - 1.6.3-1ubuntu0.3

Vulnerable software versions

haproxy (Ubuntu package): 1.6.3-1ubuntu0.1, 1.6.3-1ubuntu0.2, 1.8.8-1ubuntu0.1, 1.8.8-1ubuntu0.2, 1.8.8-1ubuntu0.3, 1.8.8-1ubuntu0.4, 1.8.8-1ubuntu0.5, 1.8.8-1ubuntu0.6, 1.8.19-1ubuntu1.1

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.