CVE-2023-38501: copyparty vulnerable to reflected cross-site scripting via k304 parameter
Summary The application contains a reflected cross-site scripting via URL-parameter ?k304=... and ?setck=...
Details A reflected cross-site scripting (XSS) vulnerability exists in the web interface of the application that could allow an attacker to execute malicious javascript code by tricking users into accessing a malicious link.
The worst-case outcome of this is being able to move or delete existing files on the server, or upload new files, using the account of the person who clicks the malicious link.
It is recommended to change the passwords of your copyparty accounts, unless you have inspected your logs and found no trace of attacks.
Checking for exposure if copyparty is running behind a reverse proxy, you can check the access-logs for traces of attacks, by grepping for URLs containing ?hc= with < somewhere in its value, for example using the following command: nginx: bash (gzip -dc access.log.gz; cat access.log) | sed -r 's/" [0-9]+ .//' | grep -iE '%0[da]%0[da]%0[da]%0[da]|?&=.[<>]' the above commands also check for attacks against GHSA-cw7j-v52w-fp5r
PoC https://localhost:3923/?k304=y%0D%0A%0D%0A%3Cimg+src%3Dcopyparty+onerror%3Dalert(1)%3E
Other sources
copyparty is file server software. Prior to version 1.8.7, the application contains a reflected cross-site scripting via URL-parameter ?k304=... and ?setck=.... The worst-case outcome of this is being able to move or delete existing files on the server, or upload new files, using the account of the person who clicks the malicious link. It is recommended to change the passwords of one's copyparty accounts, unless one have inspected one's logs and found no trace of attacks. Version 1.8.7 contains a patch for the issue.
— MITRE
Credit
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2023-38501?
The severity of CVE-2023-38501 is classified as high due to its potential to exploit reflected cross-site scripting vulnerabilities.
How do I fix CVE-2023-38501?
To fix CVE-2023-38501, update the Copyparty application to version 1.8.7 or later, where the vulnerability has been addressed.
What is reflected cross-site scripting in CVE-2023-38501?
Reflected cross-site scripting in CVE-2023-38501 allows an attacker to inject malicious scripts via URL parameters, affecting users interacting with compromised links.
Which versions of Copyparty are affected by CVE-2023-38501?
CVE-2023-38501 affects versions of Copyparty prior to 1.8.7.
How can an attacker exploit CVE-2023-38501?
An attacker can exploit CVE-2023-38501 by crafting a malicious URL with specific parameters that, when clicked by a user, execute unwanted scripts in their browser.