CVE-2022-0194 in Netatalk
Summary
by MITRE • 03/28/2023
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Netatalk. Authentication is not required to exploit this vulnerability. The specific flaw exists within the ad_addcomment function. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-15876.
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Analysis
by VulDB Data Team • 03/24/2026
The vulnerability identified as CVE-2022-0194 represents a critical buffer overflow flaw within the Netatalk file sharing software ecosystem. This vulnerability resides in the ad_addcomment function where insufficient input validation permits malicious data to be copied into a fixed-length stack-based buffer without proper length checks. The flaw fundamentally stems from poor memory management practices that fail to enforce bounds checking on user-supplied data. As a remote code execution vulnerability, it operates without requiring any authentication credentials, making it particularly dangerous for systems exposed to untrusted networks. The absence of authentication requirements significantly broadens the attack surface and reduces the barriers an attacker must overcome to exploit the vulnerability.
The technical implementation of this flaw follows a classic stack-based buffer overflow pattern where user-controllable input exceeds the allocated buffer space, leading to memory corruption. When the ad_addcomment function processes user-supplied data, it fails to validate the length of incoming parameters before performing memory copy operations. This allows an attacker to overflow the designated buffer and potentially overwrite adjacent memory locations including return addresses and control data. The vulnerability specifically targets stack-based memory allocation, which is particularly susceptible to exploitation when attackers can control the overflow behavior to redirect execution flow. According to CWE classification, this corresponds to CWE-121 Stack-based Buffer Overflow, which is categorized as a high-severity weakness in software security.
The operational impact of this vulnerability extends far beyond simple code execution capabilities, as successful exploitation grants attackers root-level privileges on affected systems. This privilege escalation occurs because Netatalk typically runs with elevated permissions to manage file sharing operations, and the buffer overflow allows malicious code to execute within the same privileged context. The implications are severe for networked environments where Netatalk serves as a file sharing service, as attackers can gain complete system control without authentication. The vulnerability affects systems running vulnerable versions of Netatalk where the service is actively listening for connections, creating potential for widespread compromise across networks. From an attack perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter, as successful exploitation would enable attackers to execute arbitrary commands with system-level privileges.
Mitigation strategies for CVE-2022-0194 must address both immediate remediation and long-term architectural improvements. The primary recommendation involves applying the vendor-provided security patches that correct the buffer overflow in the ad_addcomment function through proper input validation and length checking. Organizations should implement network segmentation to limit exposure of Netatalk services to untrusted networks, while also deploying intrusion detection systems to monitor for exploitation attempts. Additional defensive measures include configuring firewalls to restrict access to Netatalk ports, disabling unnecessary file sharing services, and implementing strict input validation at multiple layers of the application stack. System administrators should conduct thorough vulnerability assessments to identify all systems running vulnerable versions of Netatalk and prioritize patch deployment across all affected environments. The remediation process must also include monitoring for potential exploitation attempts and implementing proper logging to track access to file sharing services, as the vulnerability's remote nature makes proactive detection challenging without appropriate network monitoring capabilities.