Ubuntu update for HAproxy

Published: 2019-11-07

Risk	Medium
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2019-18277
CWE-ID	CWE-444
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	haproxy (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU22597

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-18277

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

Exploit availability: No

Description

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.

Mitigation

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 - 1.8.19-1ubuntu1.1

External links

http://usn.ubuntu.com/4174-1/

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.