CVE-2023-1304 in InsightCloudSec
Summary
by MITRE • 03/21/2023
An authenticated attacker can leverage an exposed getattr() method via a Jinja template to smuggle OS commands and perform other actions that are normally expected to be private methods. This issue was resolved in the Managed and SaaS deployments on February 1, 2023, and in version 23.2.1 of the Self-Managed version of InsightCloudSec.
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Analysis
by VulDB Data Team • 04/12/2023
This vulnerability represents a critical server-side template injection flaw in the InsightCloudSec security platform that allows authenticated attackers to execute arbitrary operating system commands through manipulated Jinja2 template processing. The vulnerability stems from an exposed getattr() method within the template engine that should normally be restricted to private method access but can be manipulated by attackers to bypass security controls. The flaw exists in the template rendering subsystem where the getattr() function is improperly exposed, allowing attackers to access and invoke private methods that typically should remain hidden from user-controlled inputs.
The technical implementation of this vulnerability exploits the Jinja2 template engine's dynamic attribute access capabilities through the getattr() method which enables attackers to traverse object hierarchies and access private methods that contain sensitive functionality. When an authenticated user submits a malicious Jinja template containing getattr() calls with crafted arguments, the system processes these expressions and executes the referenced methods, potentially leading to arbitrary code execution. This type of vulnerability aligns with CWE-94, which describes "Improper Control of Generation of Code" and specifically relates to template injection attacks where user-controllable template data leads to unintended code execution. The vulnerability operates at the intersection of insecure template handling and privilege escalation through method access control bypass.
The operational impact of this vulnerability is severe as it allows authenticated attackers to execute arbitrary commands on the underlying operating system, potentially leading to complete system compromise. Attackers can leverage this flaw to escalate privileges, access sensitive data, install backdoors, or perform other malicious activities that would normally be restricted to authorized system administrators. The vulnerability affects both managed and self-managed deployments of the InsightCloudSec platform, with the issue being resolved through version 23.2.1 for self-managed installations and through deployment updates for managed services. This represents a significant risk in security monitoring environments where the platform is used to protect critical infrastructure.
Mitigation strategies should focus on restricting access to the getattr() method within template contexts and implementing comprehensive input validation for all user-controlled template data. Organizations should immediately upgrade to version 23.2.1 or later for self-managed deployments and ensure managed services are updated through the vendor's deployment channels. Additional protective measures include implementing strict template sandboxing, disabling unnecessary template methods, and establishing comprehensive monitoring for unusual template processing patterns. The vulnerability demonstrates the importance of proper access control in template engines and aligns with ATT&CK technique T1059.001 for command and script injection, as well as T1566 for credential access through privilege escalation. Security teams should also implement network segmentation and monitoring controls to detect potential exploitation attempts through template manipulation.