CVE-1999-0484 in OpenBSD
Summary
by MITRE
Buffer overflow in OpenBSD ping.
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Analysis
by VulDB Data Team • 04/18/2026
The vulnerability identified as CVE-1999-0484 represents a critical buffer overflow flaw discovered in the OpenBSD ping utility, which forms a fundamental component of network diagnostic tools used across Unix-like operating systems. This vulnerability specifically affects the implementation of the ping command that is used to test network connectivity by sending icmp echo requests to target hosts. The buffer overflow occurs when the ping utility processes incoming icmp echo replies that contain malformed or excessively long data payloads, particularly in the handling of the reply packet's data section. The flaw arises from insufficient bounds checking in the code that processes the icmp packet data, allowing an attacker to craft specially constructed packets that exceed the allocated buffer space. This particular vulnerability is classified under CWE-121 as a stack-based buffer overflow, where the overflow occurs in the stack memory region when the program attempts to copy data into a fixed-size buffer without proper validation of input length.
The operational impact of this vulnerability extends significantly beyond simple network diagnostics, as the ping utility is widely used in both administrative and automated network monitoring systems. When exploited, the buffer overflow can lead to arbitrary code execution on systems running vulnerable versions of OpenBSD, potentially allowing remote attackers to gain unauthorized access to affected systems. The vulnerability is particularly concerning because ping is typically executed with elevated privileges in many implementations, and the attack can be mounted from remote locations without requiring authentication. Attackers can craft malicious icmp echo replies with oversized data fields that trigger the buffer overflow condition, causing the ping process to overwrite adjacent memory locations including return addresses and function pointers. This memory corruption can result in program termination, system crashes, or more seriously, allow attackers to inject and execute malicious code within the context of the ping process. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation could enable attackers to execute arbitrary commands on compromised systems.
The exploitation of this buffer overflow vulnerability demonstrates how fundamental network utilities can serve as attack vectors in modern security landscapes, particularly in environments where network monitoring and diagnostic tools are widely deployed. The flaw represents a classic example of how insufficient input validation in system utilities can create persistent security risks that remain relevant across different operating system implementations. Mitigation strategies for this vulnerability involve applying the appropriate security patches provided by OpenBSD, which typically include proper bounds checking and input validation mechanisms to prevent buffer overflows. Additionally, system administrators should consider implementing network segmentation and access controls to limit exposure to potential attackers, as well as monitoring for unusual ping traffic patterns that might indicate exploitation attempts. The vulnerability also underscores the importance of secure coding practices and regular security audits of system utilities, particularly those that handle network input data. Organizations should maintain updated security patches and conduct regular vulnerability assessments to ensure that similar buffer overflow conditions do not exist in other system components, as the underlying principles of this vulnerability remain applicable to many network-based applications and utilities.