Infinite loop in HAProxy - CVE-2024-45506

Vulnerability identifier: #VU96822

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2024-45506

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop within the h2_send() function when zero-copy forwarding for HTTP/2 is enabled. A remote attacker can consume all available system resources and cause denial of service conditions.

HAProxy
openEuler
Fedora
haproxy
haproxy-debuginfo
haproxy-debugsource
haproxy-help

Install updates from vendor's website.

HAProxy - addressed in versions 2.9.10, 3.0.4
haproxy - update to 2.9.5-4
haproxy-debuginfo - update to 2.9.5-4
haproxy-debugsource - update to 2.9.5-4
haproxy-help - update to 2.9.5-4
haproxy - addressed in versions 2.9.10-1.fc40, 3.0.4-1.fc41

• https://www.haproxy.org/download/3.1/src/CHANGELOG
• https://www.mail-archive.com/haproxy%40formilux.org/msg45281.html
• https://www.mail-archive.com/haproxy%40formilux.org/msg45280.html
• http://git.haproxy.org/?p=haproxy-3.0.git%3Ba=commitdiff%3Bh=c725db17e8416ffb3c1537aea756356228ce5e3c
• http://git.haproxy.org/?p=haproxy-3.0.git%3Ba=commitdiff%3Bh=d636e515453320c6e122c313c661a8ac7d387c7f

• Denial of service in HAProxy
• Fedora 41 update for haproxy
• Fedora 40 update for haproxy
• openEuler 24.03 LTS update for haproxy