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A vulnerability was found in Quay, which allows successful authentication even when a truncated password version is provided. This flaw affects the authentication mechanism, reducing the overall security of password enforcement. While the risk is relatively low due to the typical length of the passwords used (73 characters), this vulnerability can still be exploited to reduce the complexity of brute-force or password-guessing attacks. The truncation of passwords weakens the overall authentication process, thereby reducing the effectiveness of password policies and potentially increasing the risk of unauthorized access in the future.
CVSS 3.1 Base Score 4.8. CVSS Attack Vector: network. CVSS Attack Complexity: high. CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).
CVSS 3.1 Base Score 5.3. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
The following code intends to ensure that the user is already logged in. If not, the code performs authentication with the user-provided username and password. If successful, it sets the loggedin and user cookies to "remember" that the user has already logged in. Finally, the code performs administrator tasks if the logged-in user has the "Administrator" username, as recorded in the user cookie.
}
}ExitError("Error: you need to log in first");
););DoAdministratorTasks();Unfortunately, this code can be bypassed. The attacker can set the cookies independently so that the code does not check the username and password. The attacker could do this with an HTTP request containing headers such as:
[body of request]By setting the loggedin cookie to "true", the attacker bypasses the entire authentication check. By using the "Administrator" value in the user cookie, the attacker also gains privileges to administer the software.
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