ProFTPD Auth API security bypass

proftpd-authapi-security-bypass (33733) The risk level is classified as MediumMedium Risk

Description:

ProFTPD could allow a remote attacker to bypass security restrictions, caused by a vulnerability in the Auth API authentication modules. ProFTPD allows multiple authentication modules to run simultaneously. If the authentication modules are set with inconsistent policies, a remote attacker could exploit this vulnerability to bypass security restrictions and possibly gain unauthorized access to the system.

*CVSS:

Base Score: 7
  Access Vector: Remote
  Access Complexity: Low
  Authentication: Not Required
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 5.4
  Exploitability: Unproven
  Remediation Level: Temporary-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Refer to Bugzilla Bug 2922 for patch information. See References.

For Mandriva Linux:
Refer to MDKSA-2007:130 for patch, upgrade, or suggested workaround information. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

  • Bugzilla Bug 2922: Auth API allows one auth module to authenticate user data provided by a different auth module.
  • Debian Bug report logs - #419255: proftpd allows logins with almost no password if configured with SQLAuthTypes Plaintext.
  • ProFTPD Web site: The ProFTPD Project: Home.
  • BID-23546: ProFTPD AUTH Multiple Authentication Module Security Bypass Vulnerability
  • CVE-2007-2165: The Auth API in ProFTPD before 20070417, when multiple simultaneous authentication modules are configured, does not require that the module that checks authentication is the same as the module that retrieves authentication data, which might allow remote attackers to bypass authentication, as demonstrated by use of SQLAuthTypes Plaintext in mod_sql, with data retrieved from /etc/passwd.
  • MDKSA-2007:130: Updated proftpd packages fix authentication bypass vulnerability
  • OSVDB ID: 34602: ProFTPD Auth API Multiple Auth Module Authentication Bypass
  • SA24867: ProFTPD Auth API Multiple Authentication Modules Security Issue
  • SECTRACK ID: 1017931: ProFTPD Auth API State Error May Let Remote Users Access the System in Certain Cases
  • VUPEN/ADV-2007-1444: ProFTPD Auth API Multiple Authentication Module Data Handling Security Bypass Issue

Platforms Affected:

  • MandrakeSoft Mandrake Linux 2007
  • MandrakeSoft Mandrake Linux 2007 X86_64
  • MandrakeSoft Mandrake Linux 2007.1
  • MandrakeSoft Mandrake Linux 2007.1 X86_64
  • MandrakeSoft Mandrake Linux 2008.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0
  • MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0
  • ProFTPD ProFTPD 1.2.10

Reported:

Apr 18, 2007

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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