Cisco Small Business 200,300 and 500 Series Switches - Open Redirect

mediumseverity

6.1CVSS score

9.7%likelihood of exploitation, next 30 days

96%of all CVEs are less likely

Readycheck to confirm it

Cisco Small Business 200,300 and 500 Series Switches contain an open redirect vulnerability in the Web UI. An attacker can redirect a user to a malicious site and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.

Impact

An attacker can exploit this vulnerability to redirect users to malicious websites, leading to phishing attacks or the download of malware.

Fix

Apply the necessary patches or updates provided by Cisco to fix the open redirect vulnerability.

How to confirm it

Send: GET /
Positive when: contains in server "GoAhead-Webs" AND matches in header /(?i)Location:\shttps?:\/\/interact\.sh/cs[\w]+// AND status 302

Run it with nuclei: nuclei -id CVE-2019-1943 -u <target>

The full check

id: CVE-2019-1943

info:
  name: Cisco Small Business 200,300 and 500 Series Switches - Open Redirect
  author: bhutch
  severity: medium
  description: |
    Cisco Small Business 200,300 and 500 Series Switches contain an open redirect vulnerability in the Web UI. An attacker can redirect a user to a malicious site and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.
  impact: |
    An attacker can exploit this vulnerability to redirect users to malicious websites, leading to phishing attacks or the download of malware.
  remediation: |
    Apply the necessary patches or updates provided by Cisco to fix the open redirect vulnerability.
  reference:
    - https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190717-sbss-redirect
    - https://www.exploit-db.com/exploits/47118
    - https://nvd.nist.gov/vuln/detail/CVE-2019-1943
    - https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190717-sbss-redirect
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2019-1943
    cwe-id: CWE-601
    epss-score: 0.09687
    epss-percentile: 0.95543
    cpe: cpe:2.3:o:cisco:sg200-50_firmware:-:*:*:*:*:*:*:*
  metadata:
    verified: "true"
    max-request: 1
    vendor: cisco
    product: sg200-50_firmware
    shodan-query: "/config/log_off_page.htm"
    censys-query: "services.http.response.headers.location: /config/log_off_page.htm"
  tags: cve,cve2019,redirect,cisco,vuln

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: interact.sh

    matchers-condition: and
    matchers:
      - type: word
        part: server
        words:
          - 'GoAhead-Webs'

      - type: regex
        part: header
        regex:
          - '(?i)Location:\shttps?:\/\/interact\.sh/cs[\w]+/'

      - type: status
        status:
          - 302

References

Use this check only on systems you are authorised to test. Where the data comes from