CVE-2018-19295 in Singularity
Summary
by MITRE
Sylabs Singularity 2.4 to 2.6 allows local users to conduct Improper Input Validation attacks.
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Analysis
by VulDB Data Team • 06/19/2023
The vulnerability identified as CVE-2018-19295 affects Sylabs Singularity container runtime versions 2.4 through 2.6, presenting a critical security risk through improper input validation mechanisms. This flaw specifically targets local users who can exploit the system by manipulating input validation checks within the container execution environment. The vulnerability stems from insufficient sanitization of user-supplied data during container image processing, creating opportunities for attackers to bypass security controls and potentially execute arbitrary code within the containerized environment.
The technical implementation of this vulnerability resides in the container runtime's handling of file paths and user input during image mounting and execution phases. Attackers can craft malicious input that circumvents the validation routines designed to prevent unauthorized access to system resources. The flaw operates through a combination of path traversal techniques and input manipulation that allows local users to gain elevated privileges or access restricted filesystem areas. This improper validation creates a direct pathway for privilege escalation attacks and potentially enables attackers to execute commands with higher privileges than initially intended.
From an operational impact perspective, this vulnerability undermines the fundamental security model of containerization by allowing local users to exploit validation weaknesses that should prevent unauthorized access. The attack surface extends beyond simple privilege escalation to include potential data exfiltration, system compromise, and denial of service conditions. Organizations relying on Singularity containers for scientific computing, research environments, or enterprise applications face significant risk as local users can leverage this vulnerability to gain unauthorized access to sensitive data and system resources. The vulnerability particularly affects environments where multiple users share the same system and where container isolation is expected to maintain strict boundaries between user contexts.
Mitigation strategies for CVE-2018-19295 require immediate patching of affected Singularity versions to 2.6.1 or later, which contain the necessary input validation fixes. System administrators should implement additional security controls including mandatory access controls, user privilege restrictions, and regular security audits of container environments. The vulnerability aligns with CWE-20, which describes improper input validation as a common weakness that leads to various security issues including privilege escalation and code injection attacks. Organizations should also consider implementing the principle of least privilege, ensuring that containerized applications run with minimal required permissions and that local users have restricted access to container execution environments.
The attack patterns associated with this vulnerability follow established techniques documented in the MITRE ATT&CK framework, particularly targeting privilege escalation and defense evasion tactics. Attackers may utilize the vulnerability to establish persistent access within containerized environments, potentially moving laterally through interconnected systems. Security monitoring should focus on unusual container execution patterns, unexpected file access attempts, and privilege escalation events that could indicate exploitation of this input validation flaw. Organizations should also implement comprehensive logging and alerting mechanisms to detect potential exploitation attempts and maintain detailed audit trails of container operations for forensic analysis purposes.