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A response-header CRLF injection vulnerability in the Proxmox Virtual Environment (PVE) and Proxmox Mail Gateway (PMG) web interface allows remote manipulation of HTTP response headers. The issue is in HTTP error handling in perl5/PVE/APIServer/AnyEvent.pm, where sanitization only matched the first line of an error message and blocked LF but not standalone CR characters. As a result, attacker-controlled input containing %0d could be reflected into the response in a way that Chromium-based browsers interpreted as injected response headers. The documented exploitation path allows an attacker to set oversized cookies for the victim’s browser, leading to a client-side denial of service against the Proxmox web UI. The issue was fixed in pve-http-server 4.1-3.
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A CRLF injection vulnerability in Proxmox VE that allows response header injection via carriage return characters in error messages, enabling a client-side denial-of-service scenario in Chromium-based browsers.
A CRLF injection vulnerability in Proxmox VE's HTTP response handling that allows header injection using carriage return characters, enabling browser-dependent abuse including client-side denial of service.
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