The remote Fedora 36 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2023-d4085a681f advisory.

  - Cacti is an open source platform which provides a robust and extensible operational monitoring and fault     management framework for users. In affected versions a command injection vulnerability allows an     unauthenticated user to execute arbitrary code on a server running Cacti, if a specific data source was     selected for any monitored device. The vulnerability resides in the `remote_agent.php` file. This file can     be accessed without authentication. This function retrieves the IP address of the client via     `get_client_addr` and resolves this IP address to the corresponding hostname via `gethostbyaddr`. After     this, it is verified that an entry within the `poller` table exists, where the hostname corresponds to the     resolved hostname. If such an entry was found, the function returns `true` and the client is authorized.
    This authorization can be bypassed due to the implementation of the `get_client_addr` function. The     function is defined in the file `lib/functions.php` and checks serval `$_SERVER` variables to determine     the IP address of the client. The variables beginning with `HTTP_` can be arbitrarily set by an attacker.
    Since there is a default entry in the `poller` table with the hostname of the server running Cacti, an     attacker can bypass the authentication e.g. by providing the header `Forwarded-For: <TARGETIP>`. This way     the function `get_client_addr` returns the IP address of the server running Cacti. The following call to     `gethostbyaddr` will resolve this IP address to the hostname of the server, which will pass the `poller`     hostname check because of the default entry. After the authorization of the `remote_agent.php` file is     bypassed, an attacker can trigger different actions. One of these actions is called `polldata`. The called     function `poll_for_data` retrieves a few request parameters and loads the corresponding `poller_item`     entries from the database. If the `action` of a `poller_item` equals `POLLER_ACTION_SCRIPT_PHP`, the     function `proc_open` is used to execute a PHP script. The attacker-controlled parameter `$poller_id` is     retrieved via the function `get_nfilter_request_var`, which allows arbitrary strings. This variable is     later inserted into the string passed to `proc_open`, which leads to a command injection vulnerability. By     e.g. providing the `poller_id=;id` the `id` command is executed. In order to reach the vulnerable call,     the attacker must provide a `host_id` and `local_data_id`, where the `action` of the corresponding     `poller_item` is set to `POLLER_ACTION_SCRIPT_PHP`. Both of these ids (`host_id` and `local_data_id`) can     easily be bruteforced. The only requirement is that a `poller_item` with an `POLLER_ACTION_SCRIPT_PHP`     action exists. This is very likely on a productive instance because this action is added by some     predefined templates like `Device - Uptime` or `Device - Polling Time`. This command injection     vulnerability allows an unauthenticated user to execute arbitrary commands if a `poller_item` with the     `action` type `POLLER_ACTION_SCRIPT_PHP` (`2`) is configured. The authorization bypass should be prevented     by not allowing an attacker to make `get_client_addr` (file `lib/functions.php`) return an arbitrary IP     address. This could be done by not honoring the `HTTP_...` `$_SERVER` variables. If these should be kept     for compatibility reasons it should at least be prevented to fake the IP address of the server running     Cacti. This vulnerability has been addressed in both the 1.2.x and 1.3.x release branches with `1.2.23`     being the first release containing the patch. (CVE-2022-46169)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

Fedora 36 : cacti / cacti-spine (2023-d4085a681f)

critical Nessus Plugin ID 170004

Version 1.1