Vulnerability identifier: #VU72334

Vulnerability risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-25725

CWE-ID: CWE-444

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
HAProxy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: HAProxy

Description

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

The vulnerability exists due to improper validation of HTTP/1 requests. A remote attacker can send a specially crafted HTTP request with empty fields, which could be used to truncate the list of HTTP headers and thus make some headers disappear after being parsed and processed for HTTP/1.0 and HTTP/1.1

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

HAProxy: 2.2.0 - 2.2.28, 2.4.0 - 2.4.21, 2.5.1 - 2.5.11, 2.6.0 - 2.6.8, 2.7.0 - 2.7.2, 2.0.0 - 2.0.30, 2.3.0 - 2.3.21, 2.1.0 - 2.1.12

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External links
http://git.haproxy.org/?p=haproxy-2.7.git;a=commit;h=a0e561ad7f29ed50c473f5a9da664267b60d1112
http://lists.debian.org/debian-lts-announce/2023/02/msg00012.html
http://www.debian.org/security/2023/dsa-5348

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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.