CVE-2023-32722 in Zabbix
Summary
by MITRE • 10/25/2023
The zabbix/src/libs/zbxjson module is vulnerable to a buffer overflow when parsing JSON files via zbx_json_open.
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Analysis
by VulDB Data Team • 04/21/2025
The vulnerability identified as CVE-2023-32722 resides within the zabbix/src/libs/zbxjson module of the Zabbix monitoring platform, specifically affecting the zbx_json_open function during JSON file parsing operations. This buffer overflow vulnerability represents a critical security flaw that could potentially allow remote attackers to execute arbitrary code or cause system instability. The issue manifests when the application processes malformed or excessively large JSON input data structures, leading to memory corruption that violates the boundaries of allocated buffer space.
The technical implementation of this vulnerability stems from inadequate input validation and boundary checking within the JSON parsing logic. When zbx_json_open encounters JSON data that exceeds predetermined buffer limits or contains malformed structures, the parsing routine fails to properly handle the overflow condition. This flaw directly maps to CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability is particularly concerning because it occurs during the initial parsing phase of JSON processing, meaning that any component relying on this module for configuration file parsing or data ingestion could be compromised.
From an operational perspective, this vulnerability presents significant risk to organizations utilizing Zabbix for system monitoring and infrastructure management. Attackers could exploit this weakness by crafting malicious JSON payloads that, when processed by Zabbix, would trigger the buffer overflow condition. The impact extends beyond simple denial of service scenarios, as successful exploitation could lead to complete system compromise, data exfiltration, or unauthorized access to monitoring infrastructure. Given that Zabbix is commonly deployed in critical infrastructure environments, the potential for cascading security failures makes this vulnerability particularly dangerous. The attack surface includes any system component that accepts JSON input, including web interfaces, API endpoints, and configuration management modules.
Mitigation strategies for CVE-2023-32722 should prioritize immediate patch application from the vendor, as this represents a critical severity issue requiring urgent attention. Organizations should implement network segmentation and access controls to limit exposure of Zabbix systems to untrusted networks. Input validation should be strengthened at multiple layers, including application-level filtering and monitoring of JSON parsing operations. Security teams should deploy intrusion detection systems capable of identifying anomalous JSON processing patterns that might indicate exploitation attempts. Additionally, implementing regular security assessments and penetration testing focused on JSON parsing components will help identify similar vulnerabilities in related systems. The remediation process should also include comprehensive testing of patched systems to ensure that the buffer overflow protection mechanisms function correctly without introducing regressions in legitimate functionality. This vulnerability aligns with ATT&CK technique T1059.007, which covers scripting through JSON data manipulation, and represents a clear pathway for privilege escalation attacks targeting monitoring infrastructure.