OctoPrint prior to version 1.8.3 is vulnerable to Unrestricted Upload of File with Dangerous Type. Due to misconfiguration in move file functionality, an attacker could easily change the file extension of an uploaded malicious file disguised as a .gcode file. Version 1.8.3 contains a patch.

If an attacker comes into the possession of a victim's OctoPrint session cookie through whatever means, the attacker can use this cookie to authenticate as long as the victim's account exists.

Improper Privilege Management in GitHub repository octoprint/octoprint prior to 1.8.3.

Failure to Sanitize Special Elements into a Different Plane (Special Element Injection) in GitHub repository octoprint/octoprint prior to 1.8.3.

Impact

OctoPrint versions up until and including 1.10.0 contain a vulnerability that allows an unauthenticated attacker to completely bypass the authentication if the autologinLocal option is enabled within config.yaml, even if they come from networks that are not configured as localNetworks, by spoofing their IP via the X-Forwarded-For header.

If autologin is not enabled, this vulnerability does not have any impact.

Patches

The vulnerability has been patched in version 1.10.1.

Workaround

Until the patch has been applied, OctoPrint administrators who have autologin enabled on their instances should disable it and/or to make the instance inaccessible from potentially hostile networks like the internet.

PoC

1. Enable the autologinAs configuration within the accessControl section in the OctoPrint yaml configuration file 2. Set your browser to add the X-Forwarded-For: 127.0.0.1 header to HTTP requests. For example, this can be done using proxy software like Burp Suite. Alternatively, there are browser extensions such as https://github.com/MisterPhilip/x-forwarded-for, but I haven't tried them. 3. Navigate to OctoPrint and note that it logs you in automatically.

Credits

This vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi.

Impact

OctoPrint versions up until and including 1.9.3 contain a vulnerability that allows malicious admins to configure or talk a victim with administrator rights into configuring a webcam snapshot URL which when tested through the "Test" button included in the web interface will execute JavaScript code in the victims browser when attempting to render the snapshot image.

An attacker who successfully talked a victim with admin rights into performing a snapshot test with such a crafted URL could use this to retrieve or modify sensitive configuration settings, interrupt prints or otherwise interact with the OctoPrint instance in a malicious way.

Patches

The vulnerability will be patched in version 1.10.0.

Workaround

OctoPrint administrators are strongly advised to thoroughly vet who has admin access to their installation and what settings they modify based on instructions by strangers.

PoC

Below are the steps to reproduce the vulnerability:

1. Create a URL that responds with a malicious content type. For example, creating the following python script: from http.server import BaseHTTPRequestHandler, HTTPServer

class MyHTTPRequestHandler(BaseHTTPRequestHandler): def doGET(self): self.sendresponse(200) self.sendheader('Content-Type', 'image/"onerror="alert(1)"') self.endheaders() self.wfile.write(b'Ok')

def run(): serveraddress = ('', 8080) httpd = HTTPServer(serveraddress, MyHTTPRequestHandler) print('Server listening on 0.0.0.0:8080...') httpd.serveforever()

if name == 'main': run()

2. Go to OctoPrint settings --> Plugins --> Classic Webcam and enter the URL of that page as the Snapshot URL.

3. Click on the "Test" button to trigger XSS. A Javascript alert should appear, demonstrating the actual code injection.

Credits

This vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi.

Impact

OctoPrint versions up until and including 1.10.2 contain a vulnerability that allows an attacker that has gained temporary control over an authenticated victim's OctoPrint browser session to retrieve/recreate/delete the user's or - if the victim has admin permissions - the global API key without having to reauthenticate by re-entering the user account's password.

An attacker could use a stolen API key to access OctoPrint through its API, or disrupt workflows depending on the API key they deleted.

Patches

The vulnerability will be patched in version 1.10.3.

Credits

This vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi.

Impact

OctoPrint versions up until and including 1.10.2 are vulnerable to reflected XSS vulnerabilities through its Jinja2 template system, as this is not configured to enforce automatic escaping. This affects, among other places, the login dialog and the standalone application key confirmation dialog.

An attacker who successfully talked a victim into clicking on or through a malicious third party app successfully redirected a victim to a specially crafted link could use this to retrieve or modify sensitive configuration settings, interrupt prints or otherwise interact with the OctoPrint instance in a malicious way.

Patches

The above mentioned specific vulnerabilities of the login dialog and the standalone application key confirmation dialog will be patched in the bugfix release 1.10.3 by individual escaping of the detected locations. A global change throughout all of OctoPrint's templating system with the upcoming 1.11.0 release will handle this further, switching to globally enforced automatic escaping and thus reducing the attack surface in general.

The latter will also improve the security of third party plugins. During a transition period, third party plugins will be able to opt into the automatic escaping. With OctoPrint 1.13.0, automatic escaping will be switched over to be enforced even for third party plugins, unless they explicitly opt-out.

Credits

This vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi.

Unverified Password Change in GitHub repository octoprint/octoprint prior to 1.8.3.

The Logging subsystem in OctoPrint before 1.6.0 has incorrect access control because it attempts to manage files that are not .log files.

Cross-site Scripting (XSS) - DOM in GitHub repository octoprint/octoprint prior to 1.8.0.

OctoPrint before 1.6.0 allows XSS because API error messages include the values of input parameters.

Cross-site Scripting (XSS) - Generic in GitHub repository octoprint/octoprint prior to 1.8.0.

Impact

OctoPrint versions up until and including 1.9.2 contain a vulnerability that allows malicious admins to configure a specially crafted GCODE script through the Settings that will allow code execution during rendering of that script.

An attacker might use this to extract data managed by OctoPrint, or manipulate data managed by OctoPrint, as well as execute arbitrary commands with the rights of the OctoPrint process on the server system.

Please note that GCODE files uploaded to be printed are not affected! This vulnerability exclusively affects GCODE Scripts to be executed on connection to the printer, print pause, resume etc, as described in the documentation, to be found under Settings > GCODE Scripts and configurable only by users with the ADMIN permission.

Patches

The vulnerability has been patched in version 1.9.3.

Workarounds

OctoPrint administrators are strongly advised to thoroughly vet who has admin access to their installation and to not blindly configure arbitrary GCODE scripts found online or provided to them by third parties.

Credits

This vulnerability was discovered and responsibly disclosed to OctoPrint by tianxin Wu (Bearcat), Vulnerability Researcher at Numen Cyber Labs, Singapore.

DISPUTED OctoPrint through 1.3.9 allows remote attackers to obtain sensitive information or cause a denial of service via HTTP requests on port 8081. NOTE: the vendor disputes the significance of this report because their documentation states that with "blind port forwarding ... Putting OctoPrint onto the public internet is a terrible idea, and I really can't emphasize that enough."

An attacker can freely brute force username and password and can takeover any account. An attacker could easily guess user passwords and gain access to user and administrative accounts.