Jinja is an extensible templating engine used widely in web applications. This vulnerability allows an attacker that controls both the content and filename of a template to execute arbitrary Python code, regardless of whether Jinja's sandbox is used. The severity level is classified as medium with a CVSS score of 5.4. This means that while the vulnerability does not have a high score, it still poses a significant risk of exploitation if left unaddressed.
Risk to organizations includes potential unauthorized access to sensitive information and manipulation of application behavior. Exploitation requires the attacker to control both the filename and contents of a template, which depends on the application using Jinja. Organizations should prioritize patching immediately to mitigate this risk.
The vulnerability was published on December 23, 2024, and affects Jinja versions prior to 3.1.5. Users of applications that execute untrusted templates, where the template author can choose the filename, must be particularly vigilant. The remediation is straightforward: upgrading to Jinja version 3.1.5 fixes the issue.
As of now, there are no known exploits or public proof of concepts available for this vulnerability. This indicates a lower immediate risk, but organizations should still remain cautious and ensure that they are using the latest version of Jinja to avoid potential exploitation.
Vulnerability Details
The Jinja templating engine, widely used in web development, has a significant vulnerability that allows arbitrary code execution when both the content and filename of a template are controlled by an attacker. This vulnerability is classified under CWE-150, which pertains to 'Uncontrolled Resource Consumption'.
The affected versions are all 3.x versions prior to 3.1.5. The vulnerability was disclosed on December 23, 2024, and the fix was implemented in version 3.1.5. The vulnerability has a CVSS 4.0 score of 5.4, indicating a medium severity level.
Technical Analysis
The root cause of this vulnerability lies in the Jinja compiler, which fails to appropriately restrict the execution of arbitrary Python code when an attacker controls both the content and filename of a template. The attack vector is local, meaning that an attacker must have local access to the application or its environment.
The attack complexity is low, as it requires minimal technical knowledge to exploit the vulnerability if the conditions are met. Privileges required are low, allowing an attacker with minimal access to potentially execute code. User interaction is passive, meaning the exploitation can occur without any user consent or action.
This vulnerability has a high confidentiality, integrity, and availability impact, meaning that successful exploitation can lead to significant consequences for affected systems. Organizations should be aware of the potential impacts, which include unauthorized access and data manipulation.
Risk & Impact Analysis
The risk to organizations includes exposure to arbitrary code execution, which can lead to unauthorized access and data breaches. The potential blast radius includes any applications using Jinja with the vulnerable versions, especially those that execute untrusted templates. Organizations should assess the impact based on their specific deployment and usage of Jinja.
Given the CVSS score of 5.4, this vulnerability should be addressed in the priority patch cycle. Organizations should ensure that they are running the latest version of Jinja to prevent any potential exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all Jinja versions from 3.0.0 up to, but not including, 3.1.5. Organizations using these versions should upgrade to 3.1.5 to ensure security.
Mitigation & Remediation
Organizations should upgrade to Jinja version 3.1.5 as soon as possible to mitigate this vulnerability. If upgrading is not feasible in the short term, consider implementing strict controls on template filename and content to limit the risk of exploitation. Regularly review and update application security policies and practices.
For further assistance, organizations may consider utilizing penetration testing services to identify potential vulnerabilities.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual template file accesses and modifications. Additionally, track any anomalies in application behavior that may suggest unauthorized code execution.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights the need for secure coding practices and thorough review processes when integrating templating engines. This incident serves as a reminder that even widely used libraries can harbor severe vulnerabilities if not adequately monitored.
Organizations should evaluate their dependency on libraries like Jinja and ensure they are adopting the latest security measures. Implementing a robust vulnerability management program can help mitigate similar risks in the future.
Additionally, organizations should consider regular security assessments such as penetration testing methodology to identify and remediate vulnerabilities proactively.
In conclusion, staying informed about vulnerabilities in dependencies and implementing proactive security measures is essential for safeguarding applications.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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