EUVD-2024-0453

Comprehensive Technical Analysis of EUVD-2024-0453

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2024-0453 affects BuildKit, a toolkit used for converting source code to build artifacts. The issue allows an attacker to run containers with elevated privileges without the necessary security.insecure entitlement being explicitly enabled. This vulnerability is rated with a CVSS Base Score of 9.8, indicating a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H signifies that the vulnerability can be exploited remotely (AV:N), requires low complexity (AC:L), does not require any privileges (PR:N) or user interaction (UI:N), and has a high impact on confidentiality, integrity, and availability (C:H/I:H/A:H).

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves exploiting the BuildKit APIs to run containers with elevated privileges. An attacker could leverage this vulnerability to:

• Execute Arbitrary Code: By running a container with elevated privileges, an attacker can execute arbitrary code on the host system.
• Escalate Privileges: Gain higher-level access to the system, potentially leading to full system compromise.
• Data Exfiltration: Access sensitive data stored on the host system.
• Persistent Access: Establish a backdoor for persistent access to the system.

Exploitation methods could include crafting malicious build requests that bypass the security.insecure entitlement checks, allowing the attacker to execute privileged operations.

3. Affected Systems and Software Versions

The vulnerability affects all versions of BuildKit prior to v0.12.5. Specifically:

• BuildKit versions: < 0.12.5
• Vendor: Moby

Users and organizations utilizing BuildKit for their build processes should immediately assess their systems to determine if they are running an affected version.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following actions are recommended:

• Update BuildKit: Upgrade to BuildKit version v0.12.5 or later, which includes the fix for this vulnerability.
• Restrict Access: Ensure that BuildKit frontends are only used from trusted sources. Implement strict access controls to limit who can initiate build requests.
• Monitor and Audit: Regularly monitor and audit build processes to detect any unauthorized activities. Implement logging and alerting mechanisms to identify suspicious behavior.
• Network Segmentation: Isolate build environments from other critical systems to limit the potential impact of a compromise.
• Security Configuration: Ensure that the security.insecure entitlement is not enabled unless absolutely necessary and that its use is tightly controlled.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations within the European Union that rely on BuildKit for their build processes. Given the critical nature of the vulnerability, it could be exploited to compromise build environments, leading to potential data breaches, unauthorized access, and disruption of services. The high CVSS score and the EPSS score of 15 indicate a high likelihood of exploitation, making it a priority for cybersecurity teams to address.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2024-23653
• GHSA ID: GHSA-wr6v-9f75-vh2g
• Affected Component: BuildKit APIs for running interactive containers
• Root Cause: Insufficient entitlement checks allowing containers to run with elevated privileges

Fix Information:

• Fixed Version: v0.12.5
• Relevant Commits:
  • Commit 5026d95aa3336e97cfe46e3764f52d08bac7a10e
  • Commit 92cc595cfb12891d4b3ae476e067c74250e4b71e

References:

• GitHub Security Advisory
• NVD Entry
• BuildKit GitHub Repository
• BuildKit v0.12.5 Release

By following the recommended mitigation strategies and staying informed about the latest security advisories, organizations can effectively manage the risk associated with this vulnerability and protect their build environments from potential exploitation.