CVE-2023-25657 Remote code execution in Jinja2 template rendering in Nautobot
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2023-25657?
CVE-2023-25657 is a high-severity vulnerability in nautobot, published on 21 Feb 2023.
Official description
Nautobot is a Network Source of Truth and Network Automation Platform. All users of Nautobot versions earlier than 1.5.7 are impacted by a remote code execution vulnerability. Nautobot did not properly sandbox Jinja2 template rendering. In Nautobot 1.5.7 has enabled sandboxed environments for the Jinja2 template engine used internally for template rendering for the following objects: `extras.ComputedField`, `extras.CustomLink`, `extras.ExportTemplate`, `extras.Secret`, `extras.Webhook`. While no active exploits of this vulnerability are known this change has been made as a preventative measure to protect against any potential remote code execution attacks utilizing maliciously crafted template code. This change forces the Jinja2 template engine to use a `SandboxedEnvironment` on all new installations of Nautobot. This addresses any potential unsafe code execution everywhere the helper function `nautobot.utilities.utils.render_jinja2` is called. Additionally, the documentation that had previously suggesting the direct use of `jinja2.Template` has been revised to suggest `render_jinja2`. Users are advised to upgrade to Nautobot 1.5.7 or newer. For users that are unable to upgrade to the latest release of Nautobot, you may add the following setting to your `nautobot_config.py` to apply the sandbox environment enforcement: `TEMPLATES[1]["OPTIONS"]["environment"] = "jinja2.sandbox.SandboxedEnvironment"` After applying this change, you must restart all Nautobot services, including any Celery worker processes. **Note:** *Nautobot specifies two template engines by default, the first being “django” for the Django built-in template engine, and the second being “jinja” for the Jinja2 template engine. This recommended setting will update the second item in the list of template engines, which is the Jinja2 engine.* For users that are unable to immediately update their configuration such as if a Nautobot service restart is too disruptive to operations, access to provide custom Jinja2 template values may be mitigated using permissions to restrict “change” (write) actions to the affected object types listed in the first section. **Note:** *This solution is intended to be stopgap until you can successfully update your `nautobot_config.py` or upgrade your Nautobot instance to apply the sandboxed environment enforcement.*
Weakness: CWE-94
Which versions are affected by CVE-2023-25657?
3 open source packages ship an affected version, including nautobot. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nautobot PyPI | All versions | 1.5.7 |
nautobot PyPI | All versions | 1.5.7 |
nautobot PyPI | All versions | 1.5.7 |
Products include Networktocode Nautobot.
How do I fix CVE-2023-25657?
Upgrade nautobot to 1.5.7 or later.
Is CVE-2023-25657 being exploited?
There is no known exploitation of CVE-2023-25657 in the wild and no public exploit code.
Other vulnerabilities in nautobot
- CVE-2026-44797 Nautobot: Webhook definitions could be used for server-side request forgery (SSRF)
- CVE-2024-34707 Nautobot's BANNER_* configuration can be used to inject arbitrary HTML content into Nautobot pages
- CVE-2024-32979 Reflected Cross-site Scripting potential in all object list views in Nautobot
- CVE-2026-44798 Nautobot: GitRepository.current_head field should not be writable through REST API
- CVE-2024-23345 Nautobot has XSS potential in rendered Markdown fields
Sources
Also known as GHSA-8mfq-f5wj-vw5m, PYSEC-2023-37.