CVE-2022-35507 : Vulnerability Insights and Analysis
Learn about CVE-2022-35507, a response-header CRLF injection flaw in Proxmox Virtual Environment & Mail Gateway, impacting Chromium users. Find mitigation steps & patch details.
A response-header CRLF injection vulnerability in the Proxmox Virtual Environment (PVE) and Proxmox Mail Gateway (PMG) web interface allows a remote attacker to set cookies for a victim's browser that are longer than the server expects, causing a client-side DoS. This affects Chromium-based browsers because they allow injection of response headers with %0d. This is fixed in pve-http-server 4.1-3.
Understanding CVE-2022-35507
This section provides insights into the nature and impact of CVE-2022-35507.
What is CVE-2022-35507?
CVE-2022-35507 is a response-header CRLF injection vulnerability in the Proxmox Virtual Environment (PVE) and Proxmox Mail Gateway (PMG) web interface. It enables a remote attacker to manipulate cookies, leading to client-side DoS.
The Impact of CVE-2022-35507
The vulnerability can be exploited by malicious actors to disrupt the normal functioning of affected web interfaces, particularly impacting users of Chromium-based browsers.
Technical Details of CVE-2022-35507
This section delves into the specifics of CVE-2022-35507.
Vulnerability Description
The vulnerability arises due to the server's failure to validate the length of cookies, allowing attackers to set cookies that exceed the expected size, triggering a denial-of-service condition.
Affected Systems and Versions
The vulnerability affects the Proxmox Virtual Environment (PVE) and Proxmox Mail Gateway (PMG) web interfaces, particularly impacting users of Chromium-based browsers.
Exploitation Mechanism
Remote attackers can exploit this vulnerability by injecting response headers containing %0d, tricking the server into accepting oversized cookies.
Mitigation and Prevention
In this section, we discuss steps to mitigate and prevent exploitation of CVE-2022-35507.
Immediate Steps to Take
Users are advised to update to pve-http-server version 4.1-3 or the latest available patch to mitigate the vulnerability and prevent potential client-side DoS attacks.
Long-Term Security Practices
Implementing secure coding practices, regular security assessments, and staying informed about updates and security advisories can enhance overall system security.
Patching and Updates
Regularly monitor for security updates from Proxmox and apply patches promptly to protect systems from known vulnerabilities.