CVE-2024-1729 in gradio
Summary
by MITRE • 03/29/2024
A timing attack vulnerability exists in the gradio-app/gradio repository, specifically within the login function in routes.py. The vulnerability arises from the use of a direct comparison operation (`app.auth[username] == password`) to validate user credentials, which can be exploited to guess passwords based on response times. Successful exploitation of this vulnerability could allow an attacker to bypass authentication mechanisms and gain unauthorized access.
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Analysis
by VulDB Data Team • 07/30/2025
The timing attack vulnerability identified in CVE-2024-1729 represents a critical security flaw within the gradio-app/gradio authentication system that directly undermines the integrity of user credential validation. This vulnerability manifests specifically within the login function located in the routes.py file of the repository, where the application employs a straightforward equality comparison operation to verify user credentials. The flaw stems from the implementation pattern where the system compares the stored hash of the user's password against the provided password using a direct comparison mechanism that does not account for timing variations in execution. This approach creates a measurable difference in response times that can be systematically analyzed by an attacker to infer information about the correct password.
The technical nature of this vulnerability aligns with CWE-347, which specifically addresses weaknesses in authentication mechanisms that fail to properly handle timing variations in cryptographic operations. The flaw operates on the principle that different password lengths or partial matches will produce measurable variations in the time required for the comparison operation to complete, allowing an attacker to perform statistical analysis on response times to gradually deduce the correct password through repeated testing attempts. This timing-based approach to password recovery represents a sophisticated attack vector that leverages the inherent timing characteristics of the application's authentication logic rather than traditional brute force or dictionary attack methods. The vulnerability is particularly dangerous because it can be executed remotely without requiring elevated privileges or direct system access, making it an attractive target for malicious actors seeking unauthorized system access.
The operational impact of this vulnerability extends far beyond simple authentication bypass, as successful exploitation could lead to complete system compromise and unauthorized access to sensitive data and resources within the gradio application environment. Attackers could systematically work through password spaces using timing analysis tools to identify valid credentials, potentially gaining access to user accounts, administrative functions, and confidential information stored within the application. The vulnerability affects all users of the affected gradio version and creates a persistent risk that remains active until the underlying code is patched or modified to implement secure comparison operations. Organizations relying on this authentication system face significant exposure to credential theft, unauthorized access incidents, and potential data breaches that could result in regulatory compliance violations and financial losses. The attack surface is particularly concerning given that gradio applications are often deployed in environments where sensitive user data and business-critical applications are hosted.
Mitigation strategies for CVE-2024-1729 must focus on implementing constant-time comparison operations throughout the authentication process to eliminate timing variations that could be exploited by attackers. The recommended solution involves replacing the direct equality comparison with a secure cryptographic comparison function that maintains consistent execution time regardless of input values, effectively neutralizing the timing attack vector. This approach aligns with established security practices and standards such as those outlined in the NIST Special Publication 800-131A for cryptographic standards and the OWASP Top Ten security guidelines. Organizations should also implement additional security measures including rate limiting, account lockout mechanisms, and monitoring for suspicious authentication patterns to provide defense-in-depth against potential exploitation attempts. The implementation of proper timing-resistant comparison functions should be integrated into all authentication flows and validated through security testing to ensure that no timing variations remain in the system's response characteristics. Security teams should also consider implementing multi-factor authentication mechanisms as an additional layer of protection to mitigate the risk of credential compromise even if the timing vulnerability were to be exploited.