CVE-2023-34844 in Play With Docker
Summary
by MITRE • 06/29/2023
Play With Docker < 0.0.2 has an insecure CAP_SYS_ADMIN privileged mode causing the docker container to escape.
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Analysis
by VulDB Data Team • 01/09/2026
The vulnerability identified as CVE-2023-34844 affects Play With Docker versions prior to 0.0.2 and represents a critical privilege escalation flaw that allows container escape through insecure capabilities assignment. This issue stems from the application's improper handling of Docker container privileges, specifically granting the CAP_SYS_ADMIN capability in an insecure manner that enables attackers to break out of container isolation boundaries.
The technical flaw manifests through the misuse of Linux capabilities within Docker containers, where the application assigns the CAP_SYS_ADMIN privilege without proper sandboxing or isolation controls. This capability grants extensive system-level permissions including the ability to perform operations typically restricted to root users, such as mounting filesystems, modifying network configurations, and accessing kernel resources. When combined with the insecure container runtime configuration in Play With Docker, attackers can leverage this elevated privilege to execute arbitrary code on the host system, effectively bypassing container security boundaries.
The operational impact of this vulnerability is severe as it transforms a containerized environment into a potential attack vector for host-level compromise. An attacker who gains access to the Play With Docker interface can exploit this flaw to escalate privileges from container user to host root, potentially leading to complete system compromise. The vulnerability undermines the fundamental security premise of containerization, which relies on process isolation and privilege separation to prevent unauthorized access to underlying host resources. This type of container escape allows attackers to access sensitive host data, modify system configurations, and establish persistent access to the underlying infrastructure.
Security mitigations for this vulnerability require immediate version updates to Play With Docker 0.0.2 or later, which address the insecure capability assignment by implementing proper privilege isolation. Organizations should also review and restrict the use of CAP_SYS_ADMIN capabilities in container deployments, adhering to the principle of least privilege. The remediation aligns with CWE-250, which addresses the improper handling of privileges, and follows ATT&CK technique T1548.001 for privilege escalation through capabilities manipulation. Additional protective measures include implementing container runtime security policies, monitoring for unauthorized capability usage, and ensuring that container orchestration platforms enforce strict security boundaries. The vulnerability highlights the importance of following security best practices such as avoiding unnecessary privilege elevation and maintaining up-to-date container runtime environments to prevent similar escape scenarios.