CVE-2023-32154 in MikroTik
Summary
by MITRE • 05/03/2024
Mikrotik RouterOS RADVD Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Mikrotik RouterOS. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the Router Advertisement Daemon. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of root. . Was ZDI-CAN-19797.
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Analysis
by VulDB Data Team • 09/18/2024
The CVE-2023-32154 vulnerability represents a critical remote code execution flaw in Mikrotik RouterOS affecting the Router Advertisement Daemon component. This vulnerability falls under the Common Weakness Enumeration category CWE-787: "Out-of-bounds Write" which specifically addresses situations where software writes data past the boundaries of a fixed-length buffer. The flaw exists in the RADVD implementation within Mikrotik's RouterOS operating system, making it accessible to attackers who are network-adjacent to the affected devices. The vulnerability's severity is amplified by the fact that no authentication is required for exploitation, meaning any attacker within network range can leverage this weakness without prior credentials. This characteristic places the vulnerability in the ATT&CK framework under T1210: "Exploitation of Remote Services" and T1068: "Exploitation for Privilege Escalation" as it allows for arbitrary code execution with root privileges. The attack surface is particularly concerning given that Mikrotik routers are commonly deployed in both enterprise and residential networks, making them attractive targets for adversaries seeking persistent access or network infiltration.
The technical exploitation of this vulnerability occurs through improper validation of user-supplied data within the Router Advertisement Daemon. When the daemon processes incoming router advertisement messages, it fails to properly validate the length and content of data fields, leading to a buffer overflow condition. This out-of-bounds write vulnerability allows an attacker to overwrite adjacent memory locations, potentially corrupting critical program structures or injecting malicious code. The buffer overflow occurs in the context of the RouterOS operating system, where the daemon runs with elevated privileges, meaning successful exploitation results in code execution as root or system-level user. This privilege escalation capability makes the vulnerability particularly dangerous as it provides attackers with complete control over the affected router, potentially enabling them to modify routing tables, intercept network traffic, establish backdoors, or use the device as a pivot point for attacking other systems within the network. The vulnerability's impact extends beyond simple code execution as it fundamentally compromises the router's integrity and can be leveraged for persistent network infiltration.
The operational impact of CVE-2023-32154 is substantial across multiple network security domains. Organizations utilizing Mikrotik routers are at risk of unauthorized access to their network infrastructure, potentially leading to data breaches, man-in-the-middle attacks, or complete network compromise. The vulnerability's network-adjacent requirement means that attackers do not need to be physically present but can exploit it from within the same network segment, making it particularly dangerous in environments where network segmentation is not properly implemented. This characteristic aligns with ATT&CK technique T1570: "Lateral Tool Transfer" as compromised routers can serve as staging points for further attacks. The vulnerability also represents a significant risk to network availability and integrity, as attackers can modify routing configurations to redirect traffic or create denial-of-service conditions. Organizations may face regulatory compliance issues if this vulnerability results in unauthorized access to sensitive data, particularly in environments governed by standards such as pci dss, hipaa, or gdpr. The long-term implications include potential persistent access to network infrastructure, making it difficult for organizations to detect and remediate the compromise without thorough network forensics.
Mitigation strategies for CVE-2023-32154 should focus on immediate patching and network segmentation approaches. The primary recommended action is to apply the official Mikrotik firmware updates that address this specific buffer overflow vulnerability in the Router Advertisement Daemon. Organizations should prioritize patching all affected RouterOS installations across their network infrastructure, particularly those running versions prior to the patched releases. Network segmentation and access controls should be implemented to limit the attack surface, ensuring that only authorized network segments can communicate with router devices. The implementation of network monitoring solutions can help detect anomalous router advertisement traffic patterns that may indicate exploitation attempts. Additionally, organizations should consider disabling unused router advertisement functionality if not required for network operations. Security teams should conduct comprehensive vulnerability assessments to identify all Mikrotik devices within their network, particularly those that may be exposed to untrusted network segments. Regular network audits and penetration testing should be performed to validate the effectiveness of implemented controls. The vulnerability also highlights the importance of maintaining current firmware versions and implementing robust security practices for network infrastructure devices, as this flaw demonstrates how seemingly minor implementation issues can result in critical security breaches with root-level privileges. Organizations should also consider implementing intrusion detection systems specifically configured to monitor for exploitation attempts targeting router advertisement protocols.