CVE-2026-11405
The web server binary /bin/httpd contains a hidden backdoor authentication mechanism in the login() function at 004c88b8. - The function contains a normal authentication path using MD5/hash-based password verification (prod_encode64/PasswordToMd5/check_rand_key). - After normal authentication fails, it calls GetValue("sys.rzadmin.password") to read a backdoor password from the device configuration. - It performs a direct strcmp() comparison (plaintext, not hashed) between the config value and the user-supplied password. A successful match grants role=2 (admin-level access) and creates a valid session. The rzadmin username is never checked — any username works with the backdoor
- Score
- CVSS 3.1 9.8 Critical
- Status
- Deferred - cret@cert.org
- Published
- 2026-07-06
- Last modified
- 2026-10-25
Affected products
References
- https://cwe.mitre.org/data/definitions/912.html
- https://kb.cert.org/vuls/id/213560
- https://www.kb.cert.org/vuls/id/213560
