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The local management interface in SolarWinds Serv-U FTP Server 15.1.6.25 has incorrect access controls that permit local users to bypass authentication in the application and execute code in the context of the Windows SYSTEM account, leading to privilege escalation. To exploit this vulnerability, an attacker must have local access the the host running Serv-U, and a Serv-U administrator have an active management console session.
The local management interface in SolarWinds Serv-U FTP Server 15.1.6.25 has incorrect access controls that permit local users to bypass authentication in the application and execute code in the context of the Windows SYSTEM account, leading to privilege escalation. To exploit this vulnerability, an attacker must have local access the the host running Serv-U, and a Serv-U administrator have an active management console session.
CVSS 3.0 Base Score 7.8. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
CVSS 2.0 Base Score 7.2. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:C/I:C/A:C).
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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