CVE-2022-34960 in MikroTik
Summary
by MITRE • 08/25/2022
The container package in MikroTik RouterOS 7.4beta4 allows an attacker to create mount points pointing to symbolic links, which resolve to locations on the host device. This allows the attacker to mount any arbitrary file to any location on the host.
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Analysis
by VulDB Data Team • 09/25/2022
The vulnerability identified as CVE-2022-34960 resides within the container package of MikroTik RouterOS version 7.4beta4, representing a critical security flaw that enables unauthorized file system access and potential privilege escalation. This issue specifically affects the containerization implementation within the router operating system, where improper handling of mount point creation allows malicious actors to exploit symbolic link resolution mechanisms. The vulnerability stems from insufficient validation of file system paths during container mount operations, creating an avenue for attackers to manipulate the underlying host system through containerized environments.
The technical exploitation of this vulnerability occurs through the manipulation of symbolic link creation within container mount points, where the system fails to properly validate or sanitize the target paths of these symbolic links. When an attacker creates a mount point that references a symbolic link, the system resolves this link to its actual target location on the host device without adequate security checks. This behavior violates fundamental security principles of container isolation and allows attackers to bypass normal file system access controls. The flaw essentially enables a path traversal attack combined with privilege escalation, as the container environment can be leveraged to mount arbitrary files from the host system to arbitrary locations within the host file system.
From an operational impact perspective, this vulnerability presents a severe threat to MikroTik router security and network infrastructure integrity. Attackers can leverage this flaw to access sensitive system files, configuration data, and potentially execute arbitrary code on the host device. The implications extend beyond simple data theft to include complete system compromise, as the attacker can mount critical system files to locations where they can be modified or accessed by the containerized environment. This vulnerability particularly affects network infrastructure devices that rely on containerization for service delivery, potentially allowing attackers to escalate privileges from container user contexts to root or administrative levels on the host system.
The security implications align with CWE-22 Path Traversal and CWE-73 Path Traversal, as the vulnerability involves improper handling of file system paths that allows attackers to traverse the file system hierarchy. Additionally, this flaw maps to ATT&CK technique T1059 Command and Scripting Interpreter and T1490 Inhibit System Recovery, as it provides attackers with pathways to execute commands and potentially disrupt system operations. Organizations using MikroTik routers with affected software versions face significant risk of unauthorized access to network infrastructure, particularly in environments where containerized services are deployed. The vulnerability demonstrates a critical gap in container security implementation where symbolic link handling does not properly enforce host system boundaries.
Mitigation strategies for CVE-2022-34960 require immediate patching of affected MikroTik RouterOS installations to version 7.4 or later, which contains the necessary security fixes. Network administrators should also implement additional security controls such as disabling container functionality on routers where it is not essential, restricting container user privileges, and monitoring for suspicious mount point creation activities. The implementation of strict file system access controls and regular security audits of container configurations can help detect and prevent exploitation attempts. Organizations should also consider network segmentation and intrusion detection systems to monitor for potential exploitation attempts targeting this specific vulnerability, as the attack vector involves predictable symbolic link manipulation that can be detected through anomalous file system access patterns.