Proxmox - CRLF Injection

id: CVE-2022-35507

info:
  name: Proxmox - CRLF Injection
  author: DhiyaneshDk
  severity: high
  description: |
    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.
  impact: |
    Attackers can inject response headers with CRLF characters to set malicious cookies in victims' Chromium-based browsers, causing client-side denial of service and potentially facilitating session fixation attacks on Proxmox users.
  remediation: |
    Update pve-http-server to version 4.1-3 or later that properly validates and strips CRLF characters from response headers.
  reference:
    - https://git.proxmox.com/?p=pve-http-server.git%3Ba=commitdiff%3Bh=936007ae0241811093155000486da171379c23c2
    - https://github.com/advisories/GHSA-xfgp-gpjw-wmqr
    - https://starlabs.sg/blog/2022/12-multiple-vulnerabilites-in-proxmox-ve--proxmox-mail-gateway/#bug-0x02-crlf-injection-in-response-headers
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
    cvss-score: 7.1
    cve-id: CVE-2022-35507
    cwe-id: CWE-74
    epss-score: 0.0138
    epss-percentile: 0.68792
    cpe: cpe:2.3:a:proxmox:proxmox_mail_gateway:-:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: proxmox
    product: proxmox_mail_gateway
    shodan-query: html:"Proxmox = {"
  tags: cve,cve2022,proxmox,crlf,vuln

http:
  - raw:
      - |
        GET /404%0dnew-header:value%0da: HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - "contains(all_headers, 'new-header:value')"
          - "status_code == 501"
        condition: and
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