Description:

CVE-2024-23651 is a race condition vulnerability in BuildKit, a toolkit for converting source code to build artifacts. This vulnerability allows two malicious build steps running in parallel sharing the same cache mounts with subpaths to access files from the host system within the build container. The SVRS score of 34 indicates a moderate risk, requiring attention and appropriate mitigation measures.

Key Insights:

1. Exploitable in Parallel Builds: The vulnerability can be exploited when two malicious build steps run concurrently and share the same cache mounts with subpaths. This condition creates a race condition, enabling unauthorized access to host system files within the build container.

2. Potential Data Exfiltration: The vulnerability could allow attackers to exfiltrate sensitive data from the host system, including source code, credentials, or other confidential information, by exploiting the race condition.

3. Limited Workarounds: The provided workarounds, such as avoiding untrusted sources or using specific Dockerfile options, may not be feasible or effective in all scenarios, leaving systems vulnerable to exploitation.

Mitigation Strategies:

1. Update BuildKit: The most effective mitigation is to update BuildKit to version 0.12.5 or later, which includes the fix for this vulnerability.

2. Restrict Access to BuildKit: Implement strict access controls to limit who can use BuildKit and the types of builds that can be executed.

3. Monitor Build Activity: Establish continuous monitoring of build activity to detect any suspicious or anomalous behavior that may indicate exploitation attempts.

4. Implement Least Privilege: Enforce the principle of least privilege by granting users only the minimum permissions necessary to perform their tasks, reducing the impact of potential exploits.

Additional Information:

• Threat Actors/APT Groups: There is no information available regarding specific threat actors or APT groups actively exploiting this vulnerability.

• Exploit Status: Active exploits have not been publicly disclosed at this time.

• CISA Warnings: The Cybersecurity and Infrastructure Security Agency (CISA) has not issued a warning for this vulnerability.

• In the Wild: There is no evidence to suggest that this vulnerability is actively exploited in the wild.

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