EUVD-2023-2753

Comprehensive Technical Analysis of EUVD-2023-2753

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in EUVD-2023-2753 affects Cachet, an open-source status page system. The issue arises from a flaw in the template functionality, which allows users to create templates that can execute arbitrary code on the server. This vulnerability is due to inadequate filtration and the use of an outdated Twig version. The severity of this vulnerability is rated with a CVSS Base Score of 9.1, indicating a critical risk.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability can be exploited remotely over the network.
• AC:L (Low Complexity): The attack requires low skill or resources to exploit.
• PR:L (Low Privileges Required): The attacker needs low-level privileges to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required for the attack to succeed.
• S:C (Changed Scope): The vulnerability can affect resources beyond the security scope managed by the security authority.
• C:H (High Confidentiality Impact): There is a high impact on the confidentiality of the data.
• I:L (Low Integrity Impact): There is a low impact on the integrity of the data.
• A:L (Low Availability Impact): There is a low impact on the availability of the system.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves exploiting the template functionality to inject and execute malicious code. An attacker could:

• Inject Malicious Code: By crafting a template that includes malicious code, an attacker can execute arbitrary commands on the server.
• Exploit Old Twig Version: The use of an outdated Twig version may have additional vulnerabilities that can be exploited to escalate privileges or perform other malicious actions.

3. Affected Systems and Software Versions

The vulnerability affects all versions of Cachet prior to the 2.4 branch. Specifically:

• Cachet versions < 2.4: These versions are vulnerable to the code execution issue.
• Patched Version: The issue is resolved in the 2.4 branch with the commit 6fb043e109d2a262ce3974e863c54e9e5f5e0587.

4. Recommended Mitigation Strategies

To mitigate this vulnerability, the following steps are recommended:

• Update to the Latest Version: Upgrade Cachet to version 2.4 or later, which includes the patch for this issue.
• Implement Input Validation: Ensure that all user inputs, especially those related to template creation, are properly validated and sanitized.
• Regular Security Audits: Conduct regular security audits and code reviews to identify and fix similar vulnerabilities.
• Use Updated Libraries: Ensure that all third-party libraries, including Twig, are up to date with the latest security patches.

5. Impact on European Cybersecurity Landscape

The vulnerability in Cachet poses a significant risk to organizations using this open-source status page system within the European Union. Given the critical nature of the vulnerability, it could lead to:

• Data Breaches: Unauthorized access to sensitive information.
• Service Disruptions: Potential denial-of-service attacks affecting the availability of status pages.
• Compliance Issues: Non-compliance with data protection regulations such as GDPR, leading to legal and financial repercussions.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2023-43661
• GHSA ID: GHSA-hv79-p62r-wg3p
• Affected Product: Cachet
• Affected Versions: < 2.4
• Patch Commit: 6fb043e109d2a262ce3974e863c54e9e5f5e0587

References:

• GitHub Security Advisory
• NVD Detail
• Patch Commit
• Cachet GitHub Repository

EPSS Score: 1 (indicating a low likelihood of exploitation in the wild, but this should not deter from immediate patching due to the critical nature of the vulnerability).

ENISA IDs:

• Product ID: 7aff9b5e-6f76-3770-a4b3-c012c8d40bff
• Vendor ID: 30be6305-e297-3d30-8973-3f6deb04f6db

By addressing this vulnerability promptly, organizations can significantly reduce the risk of exploitation and ensure the security and integrity of their status page systems.