GHSA-9gjj-6gj7-c4wj Denial-of-Service attack in pyLoad CNL Blueprint using dukpy.evaljs

• PyPI pyload-ng: < 0.5.0b3.dev92 → fixed in 0.5.0b3.dev92

Dear Maintainers, I am writing to you on behalf of the Tencent AI Sec. We have identified a potential vulnerability in one of your products and would like to report it to you for further investigation and mitigation. Summary The `jk` parameter is received in pyLoad CNL Blueprint. Due to the lack of `jk` parameter verification, the `jk` parameter input by the user is directly determined as dykpy.evaljs(), resulting in the server CPU being fully occupied and the web-ui becoming unresponsive. Details • Endpoint: flash/addcrypted2 • affected file: https://github.com/pyload/pyload/blob/develop/src/pyload/webui/app/blueprints/cnl_blueprint.py#L123 https://github.com/pyload/pyload/blob/develop/src/pyload/core/utils/misc.py#L42 affected code ```python @bp.route("/flash/addcrypted2", methods=["POST"], endpoint="addcrypted2") @local_check def addcrypted2(): package = flask.request.form.get( "package", flask.request.form.get("source", flask.request.form.get("referer")) ) crypted = flask.request.form["crypted"] jk = flask.request.form["jk"] pack_password = flask.request.form.get("passwords") crypted = standard_b64decode(unquote(crypted.replace(" ", "+"))) jk = eval_js(f"{jk} f()") ``` ```python def eval_js(script, es6=False): if sys.version_info web-ui unresponsive