CVE-2005-1650 in PostMaster
Summary
by MITRE
The web mail service in Woppoware PostMaster 4.2.2 (build 3.2.5) generates different error messages depending on whether a user exists or not, which allows remote attackers to determine valid usernames.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 06/01/2019
The vulnerability identified as CVE-2005-1650 represents a critical information disclosure flaw within the web mail service component of Woppoware PostMaster version 4.2.2. This security weakness stems from the application's inconsistent error handling behavior when processing user authentication requests. The flaw operates by generating distinct error messages based on whether the requested username exists within the system's user database, creating a clear distinction that attackers can exploit to enumerate valid accounts through simple trial and error approaches.
This vulnerability directly maps to CWE-200, which categorizes information exposure issues, and demonstrates a classic example of how error message discrimination can undermine security controls. The technical implementation involves the web service's authentication routine returning different response codes or error text when a user attempts to log in with either a valid or invalid username. When a valid username is submitted, the system typically responds with an authentication failure message that implies the account exists but the password is incorrect. Conversely, when an invalid username is provided, the response often indicates that the account does not exist at all, creating a clear binary indicator for attackers.
The operational impact of this vulnerability extends beyond simple account enumeration, as it provides attackers with the foundational information needed for more sophisticated attacks including brute force password guessing, credential stuffing, and social engineering campaigns. Security analysts should note that this vulnerability aligns with ATT&CK technique T1078.004, which covers valid accounts obtained through credential access, as the ability to identify valid usernames significantly reduces the attack surface for subsequent exploitation attempts. The flaw particularly affects systems where user enumeration is not properly mitigated, making it a prime target for automated attack tools that can rapidly cycle through username lists to identify active accounts.
Mitigation strategies should focus on implementing consistent error handling across all authentication endpoints, ensuring that all user account validation attempts return identical error messages regardless of whether the account exists. Organizations should consider implementing account lockout mechanisms, rate limiting, and CAPTCHA systems to prevent automated enumeration attempts. Additionally, the implementation of proper logging and monitoring can help detect suspicious authentication patterns that may indicate active enumeration attempts. Security teams must also evaluate their current authentication infrastructure to ensure that similar vulnerabilities do not exist in other components, particularly those handling user account management functions. The remediation process should include thorough testing to verify that error messages remain consistent across all user validation scenarios, preventing attackers from gaining any information about the system's user base through simple authentication attempts.