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Executive Summary

CVE-2025-34155 is a user enumeration vulnerability in Tibbo AggreGate Network Manager versions prior to 6.40.05. The login functionality returns different error messages depending on whether a username exists or not. This discrepancy allows an unauthenticated remote attacker to determine which usernames are valid by analyzing the responses, facilitating user enumeration. [1]

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Impact Analysis

This vulnerability can allow an attacker to identify valid usernames on the system without authentication. Knowing valid account identifiers increases the risk of targeted brute-force or credential-stuffing attacks, potentially leading to unauthorized access if passwords are weak or reused. [1]

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Detection Guidance

This vulnerability can be detected by observing the login responses from Tibbo AggreGate Network Manager versions prior to 6.40.05. Specifically, by submitting different usernames during authentication attempts and analyzing the error messages returned, an attacker can infer whether a username exists based on the discrepancy in responses. To detect this on your system, you can perform controlled login attempts with both valid and invalid usernames and compare the error messages. For example, using curl commands to send login requests and observe the responses can help identify the discrepancy. Example command: curl -X POST -d 'username=someuser&password=somepass' http://<target>/login -v and compare responses for different usernames. [1]

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Mitigation Strategies

Immediate mitigation steps include upgrading Tibbo AggreGate Network Manager to version 6.40.05 or later, where this vulnerability is fixed. Additionally, you can implement uniform error messages for authentication failures to prevent user enumeration. Monitoring login attempts for unusual activity and applying rate limiting or account lockout policies can also reduce the risk of brute-force or credential-stuffing attacks facilitated by this vulnerability. [1]

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