Advisory details:
pypa / pyload-ng/PYSEC-2026-1820
| Advisory ID | pypa/pyload-ng/PYSEC-2026-1820 |
| Aliases |
CVE-2024-21644
GHSA-mqpq-2p68-46fv PYSEC-2026-1820 |
| Summary | pyload Unauthenticated Flask Configuration Leakage vulnerability ### Summary Any unauthenticated user can browse to a specific URL to expose the Flask config, including the `SECRET_KEY` variable. ### Details Any unauthenticated user can browse to a specific URL to expose the Flask config, including the `SECRET_KEY` variable. ### PoC Run `pyload` in the default configuration by running the following command ``` pyload ``` Now browse to `http://localhost:8000/render/info.html`. Notice how the Flask configuration gets displayed.  I was quite amused by this finding. I think it's a very interesting coming together of things that is so unlikely to happen. Below I will detail my process a bit more. I was looking through the code to see how the authorization mechanism is implemented when I spotted this route, which can be accessed by any unauthenticated actor - https://github.com/pyload/pyload/blob/57d81930edb59177c60830ad8ac36a91d0ec4c4e/src/pyload/webui/app/blueprints/app_blueprint.py#L33C1-L37C51 ```python @bp.route("/render/<path:filename>", endpoint="render") def render(filename): mimetype = mimetypes.guess_type(filename)[0] or "text/html" data = render_template(filename) return flask.Response(data, mimetype=mimetype) ``` This route allows me to load in any of the predefined templates. However, these templates will be lacking any form of context, and as such it doesn't seem too useful. That is until I loaded the `info.html` template and scrolled down, revealing the Flask config. This was purely accidental, and I did not understand why it happened, until I looked at the template - https://github.com/pyload/pyload/blob/57d81930edb59177c60830ad8ac36a91d0ec4c4e/src/pyload/webui/app/templates/info.html#L64C1-L67C10 ```python <tr> <td>{{ _("Config folder:") }}</td> <td>{{ config }}</td> </tr> ``` In Flask, every template always gets the Flask config passed to it as the `config` variable. In the normal execution of this template, this value gets overwritten in the function below, but since we're calling it and bypassing this function altogether, it doesn't get overwritten. Would this variable not be named config and named `configuration` or `Config` instead, then this exploit wouldn't work. The likelihood of this occurring is so small, but it seems to have happened here. - https://github.com/pyload/pyload/blob/57d81930edb59177c60830ad8ac36a91d0ec4c4e/src/pyload/webui/app/blueprints/app_blueprint.py#L450C1-L461C51 ```python context = { "python": sys.version, "os": " ".join((os.name, sys.platform) + extra), "version": api.get_server_version(), "folder": PKGDIR, "config": api.get_userdir(), "download": conf["general"]["storage_folder"]["value"], "freespace": format.size(api.free_space()), "webif": conf["webui"]["port"]["value"], "language": conf["general"]["language"]["value"], } return render_template("info.html", **context) ``` ### Impact Depending on the how the Flask config data is used, it could have detrimental consequences for the security. It's crucial to keep the `SECRET_KEY` secret and never expose it in your code or configuration files. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.8 |
| Risk | 3.4 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| There are no known CWE. |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 7.5 | https://github.com/pypa/advisory-database/blob/main/vulns/pyload-ng/PYSEC-2026-1820.yaml |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/pyload/pyload | ||
| https://github.com/pyload/pyload/commit/bb22063a875ffeca357aaf6e2edcd09705688c40 | ||
| https://pypi.org/project/pyload-ng | ||
| CVE-2024-21644 | https://nvd.nist.gov/vuln/detail/CVE-2024-21644 | |
| GHSA-mqpq-2p68-46fv | https://github.com/advisories/GHSA-mqpq-2p68-46fv | |
| GHSA-mqpq-2p68-46fv | https://github.com/pyload/pyload/security/advisories/GHSA-mqpq-2p68-46fv |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2024-01-09T19:55:57Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2024/21xxx/CVE-2024-21644.json
Source Advisory: vulnrichment/CVE-2024-21644
[{'Exploitation': 'poc'},
{'Automatable': 'no'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]