Blahz-DNS could allow a remote attacker to bypass authentication

blahzdns-auth-bypass (8951) The risk level is classified as MediumMedium Risk


Blahz-DNS could allow a remote attacker to bypass authentication and modify DNS entries. A remote attacker can access PHP scripts directly, bypassing the login page, to gain administrator access to Blahz-DNS. An attacker could use this vulnerability to prepare for future attacks against the affected network.


Bypass Security


Upgrade to the latest version of Blahz-DNS (0.25 or later), available from the Freshmeat Web site. See References.


  • BugTraq Mailing List, Sun Apr 28 2002 - 15:59:52 CDT: Blahz-DNS: Authentication bypass vulnerability.
  • Freshmeat Web site: Project details for Blahz-DNS.
  • Project: Blahz-DNS: Release Notes.
  • BID-4618: Blahz-DNS Direct Script Call Authentication Bypass Vulnerability
  • CVE-2002-0599: Blahz-DNS 0.2 and earlier allows remote attackers to bypass authentication and modify configuration by directly requesting CGI programs such as dostuff.php instead of going through the login screen.
  • OSVDB ID: 5178: Blahz-DNS dostuff.php Authentication Bypass
  • US-CERT VU#186131: Blahz-DNS does not properly authenticate users before granting access to various configuration pages

Platforms Affected:

  • Mike Roest Blahz-DNS 0.2 and prior


Apr 28, 2002

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