PAM (Pluggable Authentication Module) disabled passwords could allow an attacker to bypass authentication

pam-disabled-bypass-authentication (10405) The risk level is classified as HighHigh Risk

Description:

PAM (Pluggable Authentication Module) could allow a remote attacker to bypass authentication and gain unauthorized access to the system, caused by a vulnerability in the authentication process. PAM validates disabled passwords as empty passwords. A remote attacker could exploit this vulnerability by authenticating using an unauthorized password to gain unauthorized access to the vulnerable system.


Consequences:

Bypass Security

Remedy:

For Debian GNU/Linux:
Upgrade to the latest PAM package, as listed below. Refer to Debian Linux Security Advisory DSA-177-1 for more information. See References.

Debian GNU/Linux unstable (sid): 0.76-6 or later

References:

  • BID-5994: Linux PAM Authentication Bypass Vulnerability
  • CVE-2002-1227: PAM 0.76 treats a disabled password as if it were an empty (null) password, which allows local and remote attackers to gain privileges as disabled users.
  • DSA-177: pam -- serious security violation
  • OSVDB ID: 5003: PAM Reads Disabled Passwords as Blank Passwords

Platforms Affected:

  • Debian Debian Linux 3.0
  • PADL PAM 0.76

Reported:

Oct 17, 2002

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