Courier Mail Server authentication daemon allows deactivated account access
| courier-authdaemon-unauth-access (23532) |  Medium Risk |
Description:
A vulnerability in the Courier authentication daemon (courier-authdaemon) could allow unauthorized access to the Courier Mail Server. The authentication daemon incorrectly allows access for accounts that have been deactivated. A remote attacker, with deactivated account credentials, could exploit this vulnerability to bypass security restrictions and gain unauthorized access to the Courier Mail Server.
Consequences:
Bypass Security
Remedy:
For Debian GNU/Linux:
Refer to DSA-917-1 for upgrade information. See References.
For Ubuntu Linux:
Refer to USN-226-1 for patch, upgrade, or suggested workaround information. See References.
For other distributions:
Contact your vendor for patch or upgrade information.
References:
- Courier Mail Server Web site: Courier Mail Server.
- BID-15771: Courier Mail Server Unauthorized Access Vulnerability
- CVE-2005-3532: authpam.c in courier-authdaemon for Courier Mail Server 0.37.3 through 0.52.1, when using pam_tally, does not call the pam_acct_mgmt function to verify that access should be granted, which allows attackers to authenticate to the server using accounts that have been disabled.
- DSA-917: courier -- programming error
- SA17919: Debian courier Deactivated Account Authentication Bypass
- USN-226-1: Courier vulnerability
Platforms Affected:
- Canonical Ubuntu 4.10
- Canonical Ubuntu 5.04
- Canonical Ubuntu 5.10
- Debian Debian Linux 3.0
- Debian Debian Linux 3.1
- Double Precision Courier
Reported:
Dec 08, 2005
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