HTTP request smuggling in HAProxy

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU100972

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-53008

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 attacks.

The vulnerability exists due to improper validation of HTTP/3 requests. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

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: 2.6.0 - 3.0.2

CPE2.3

• cpe:2.3:a:haproxy:haproxy:2.6.18:*:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy:2.7.12:*:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy:2.8.10:*:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy:2.9.9:*:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy:3.0.2:*:*:*:*:*:*:*

External links

https://git.haproxy.org/?p=haproxy-2.6.git;a=commit;h=1afca10150ac3e4e2224055cc31b6f1e4a70efe2
https://git.haproxy.org/?p=haproxy-2.8.git;a=commit;h=01c1056a44823c5ffb8f74660b32c099d9b5355b
https://git.haproxy.org/?p=haproxy-2.9.git;a=commit;h=4bcaece344c8738dac1ab5bd8cc81e2a22701d71
https://git.haproxy.org/?p=haproxy-3.0.git;a=commit;h=95a607c4b3af09be2a495b9c2872ea252ccff603

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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