Timing Side-Channel in xrdp Login Interface

Executive Summary

xrdp versions 0.10.6 and prior have a timing side-channel vulnerability in the login interface. An attacker can exploit timing differences in responses to determine if a username exists on the system, leading to unauthorized information disclosure through username enumeration.

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Detection Guidance

To detect this vulnerability, monitor xrdp login response times for discrepancies. An attacker can measure delays to infer valid usernames. Check if your xrdp version is 0.10.6 or earlier. Use commands like 'xrdp --version' to verify the installed version.

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Impact Analysis

This vulnerability allows remote attackers to discover valid usernames on the system without authentication. This can be used for further attacks like brute force or social engineering by confirming which accounts exist.

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Compliance Impact

This vulnerability may impact compliance with GDPR and HIPAA by enabling unauthorized disclosure of usernames, which could be considered personal data under GDPR or protected health information under HIPAA. The timing side-channel allows attackers to infer valid usernames, potentially violating data confidentiality requirements in these regulations.

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Mitigation Strategies

Upgrade xrdp to version 0.10.6.1 or later immediately. This version patches the timing side-channel vulnerability. If upgrading is not possible, restrict network access to xrdp or disable it until patched.

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