Nova noVNC - Open Redirect

mediumseverity

6.1CVSS score

26.8%likelihood of exploitation, next 30 days

98%of all CVEs are less likely

Readycheck to confirm it

Nova noVNC contains an open redirect vulnerability. 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 potential phishing attacks.

Fix

Apply the latest security patches or updates provided by the vendor to fix the open redirect vulnerability in the Nova noVNC application.

How to confirm it

Send: GET {{BaseURL}}//interact.sh/%2f..
Positive when: matches in header /(?m)^(?:Location\s*?:\s*?)(?:https?://|//)?(?:[a-zA-Z0-9\-_\.@]*)interact\.sh.*$/ AND status 302 or 301

Run it with nuclei: nuclei -id CVE-2021-3654 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-3654

info:
  name: Nova noVNC - Open Redirect
  author: geeknik
  severity: medium
  description: Nova noVNC contains an open redirect vulnerability. 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 potential phishing attacks.
  remediation: |
    Apply the latest security patches or updates provided by the vendor to fix the open redirect vulnerability in the Nova noVNC application.
  reference:
    - https://seclists.org/oss-sec/2021/q3/188
    - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3654
    - https://bugs.python.org/issue32084
    - https://opendev.org/openstack/nova/commit/04d48527b62a35d912f93bc75613a6cca606df66
    - https://nvd.nist.gov/vuln/detail/CVE-2021-3654
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-3654
    cwe-id: CWE-601
    epss-score: 0.26792
    epss-percentile: 0.98046
    cpe: cpe:2.3:a:openstack:nova:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: openstack
    product: nova
  tags: cve2021,cve,redirect,novnc,seclists,openstack,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}//interact.sh/%2f..'

    matchers-condition: and
    matchers:
      - type: regex
        part: header
        regex:
          - '(?m)^(?:Location\s*?:\s*?)(?:https?://|//)?(?:[a-zA-Z0-9\-_\.@]*)interact\.sh.*$'

      - type: status
        status:
          - 302
          - 301

References

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