CVE-2003-1066 in Solaris
Summary
by MITRE
Buffer overflow in the syslog daemon for Solaris 2.6 through 9 allows remote attackers to cause a denial of service (syslogd crash) and possibly execute arbitrary code via long syslog UDP packets.
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Analysis
by VulDB Data Team • 07/20/2025
The vulnerability identified as CVE-2003-1066 represents a critical buffer overflow flaw within the syslog daemon implementation of solaris operating systems versions 2.6 through 9. This issue stems from inadequate input validation mechanisms within the daemon's handling of udp network packets, specifically when processing syslog messages received over the network. The buffer overflow occurs when the daemon receives malformed udp packets containing excessively long syslog messages that exceed the allocated buffer space. This vulnerability operates at the network level and affects the core system logging functionality that is essential for system administration and security monitoring.
The technical exploitation of this vulnerability occurs through the manipulation of udp packets sent to the syslog daemon listening on standard udp port 514. When the daemon processes these oversized packets, the lack of proper bounds checking causes data to overflow into adjacent memory locations, potentially corrupting critical program state information. This memory corruption can lead to unpredictable behavior including program crashes that result in denial of service conditions. In certain circumstances where the overflow occurs in a predictable manner, attackers may be able to manipulate the program execution flow to inject and execute arbitrary code with the privileges of the syslog daemon process, which typically runs with elevated system privileges.
The operational impact of this vulnerability extends beyond simple service disruption to encompass potential system compromise and data integrity threats. The denial of service aspect directly affects system logging capabilities, which represents a fundamental security infrastructure component that organizations rely upon for monitoring system activities, detecting intrusion attempts, and maintaining audit trails. When the syslog daemon crashes, system administrators lose crucial logging information that could be essential for forensic analysis and security incident response. The potential for remote code execution introduces additional risk as it allows attackers to gain unauthorized access to system resources and potentially establish persistent access points within the network infrastructure.
Mitigation strategies for CVE-2003-1066 should prioritize immediate patch application from sun microsystems to address the underlying buffer overflow conditions in the syslog daemon implementation. Organizations should also implement network level controls including firewall rules that restrict udp port 514 access to trusted network segments only, thereby limiting the attack surface. Network intrusion detection systems should be configured to monitor for unusual udp packet sizes targeting the syslog service. Additionally, system administrators should consider implementing redundant logging mechanisms and ensuring that logging configurations are properly monitored for signs of exploitation attempts. The vulnerability aligns with CWE-121 which describes heap-based buffer overflow conditions, and represents a classic example of how network services can become attack vectors when proper input validation is absent. From an attack framework perspective, this vulnerability maps to the privilege escalation and denial of service categories within the mitre attack framework, demonstrating how foundational system services can be leveraged to compromise overall system security posture.