CVE-2019-25067 in Podman
Summary
by MITRE • 06/09/2022
A vulnerability, which was classified as critical, was found in Podman and Varlink 1.5.1. This affects an unknown part of the component API. The manipulation leads to Privilege Escalation. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 02/16/2024
The vulnerability identified as CVE-2019-25067 represents a critical privilege escalation flaw within Podman and Varlink 1.5.1 that exposes a fundamental security weakness in the application programming interface component. This vulnerability specifically targets an unknown but critical portion of the API functionality, creating a pathway for unauthorized elevation of privileges that could allow attackers to gain higher-level system access than initially permitted. The flaw's classification as critical indicates the severe potential impact on system security and the high likelihood of successful exploitation.
The technical nature of this vulnerability stems from improper access controls or authorization mechanisms within the Varlink API implementation that Podman utilizes for communication between processes. When a user or process interacts with the Podman container management system through the Varlink interface, the system fails to properly validate or restrict the privileges associated with certain API calls. This allows an attacker to manipulate the API in such a way that they can escalate their privileges from a standard user level to a root or administrative level, bypassing normal security boundaries that should prevent such unauthorized access.
The operational impact of CVE-2019-25067 extends beyond simple privilege escalation, as it enables remote exploitation capabilities that make the vulnerability particularly dangerous in production environments. Attackers can initiate the exploit without requiring local system access, meaning they can target systems from external networks or compromised internal endpoints. This remote attack vector significantly increases the attack surface and makes the vulnerability more attractive to threat actors who seek to gain unauthorized control over containerized environments. The fact that the exploit has been publicly disclosed further amplifies the risk, as it provides malicious actors with readily available tools to target vulnerable systems.
The implications of this vulnerability align with CWE-276, which addresses improper privileges and access control issues, and can be mapped to ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation." Organizations running Podman or Varlink 1.5.1 systems face significant risk of unauthorized access to containerized applications and underlying host systems, potentially leading to data breaches, system compromise, and further lateral movement within networks. The vulnerability essentially undermines the security model that containerization technologies rely on to isolate processes and limit potential damage from compromised containers.
Mitigation strategies should prioritize immediate patching of affected systems to address the root cause of the privilege escalation vulnerability. Organizations must ensure all instances of Podman and Varlink 1.5.1 are updated to versions that contain the necessary security fixes. Additionally, network segmentation and access control measures should be implemented to limit exposure of affected systems to untrusted networks, while monitoring should be enhanced to detect anomalous API access patterns that might indicate exploitation attempts. Security teams should also conduct comprehensive assessments of their containerized environments to identify any potential unauthorized access that may have occurred during the window when systems were vulnerable to this exploit.