CVE-2006-2289 in avahi
Summary
by MITRE
Buffer overflow in avahi-core in Avahi before 0.6.10 allows local users to execute arbitrary code via unknown vectors.
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Analysis
by VulDB Data Team • 07/26/2018
The vulnerability identified as CVE-2006-2289 represents a critical buffer overflow condition within the avahi-core component of the Avahi service daemon suite. This issue affects versions prior to 0.6.10 and specifically targets local users who can exploit the flaw to execute arbitrary code on the affected system. The buffer overflow occurs within the core networking functionality that handles service discovery and announcement mechanisms typical of the Avahi implementation. This vulnerability is particularly concerning because it operates at the system level where local users already possess some degree of access, making exploitation more feasible compared to remote attacks that require additional network exposure vectors.
The technical nature of this buffer overflow stems from inadequate input validation and memory management within the avahi-core library. When processing certain network service announcements or queries, the software fails to properly bounds-check data structures before copying them into fixed-size buffers. This classic programming error allows attackers to overwrite adjacent memory locations, potentially corrupting program execution flow and enabling code injection. The vulnerability manifests through unknown vectors, suggesting that multiple pathways within the service discovery protocol could trigger the overflow condition, making it particularly difficult to fully characterize without comprehensive reverse engineering analysis. Such a flaw aligns with CWE-121, which categorizes stack-based buffer overflow conditions, and may also relate to CWE-787, representing out-of-bounds write vulnerabilities that can lead to arbitrary code execution.
The operational impact of CVE-2006-2289 extends beyond simple privilege escalation as it provides a direct path for local attackers to gain elevated system privileges. Since Avahi typically runs with system-level privileges to manage network service discovery, successful exploitation could allow an attacker to execute malicious code with the same permissions as the Avahi service itself. This creates a significant risk for systems where Avahi is actively running, particularly in enterprise environments where service discovery is widely used for network management and application deployment. The vulnerability affects systems where local users have access to the service, which in many enterprise environments includes standard user accounts that may be compromised through social engineering or other attack vectors. The attack surface is particularly large given that Avahi implementations are common in Linux desktop environments, server configurations, and embedded systems that rely on multicast DNS for service discovery.
Mitigation strategies for this vulnerability center around immediate patch application to upgrade to Avahi version 0.6.10 or later, which contains the necessary memory management fixes and input validation improvements. System administrators should prioritize this update across all affected systems, particularly those running in enterprise environments where Avahi service discovery is actively utilized. Additional defensive measures include implementing strict access controls to limit local user privileges where possible, monitoring for unusual network service discovery activity that might indicate exploitation attempts, and employing intrusion detection systems that can identify anomalous behavior patterns associated with buffer overflow exploitation. Organizations should also consider implementing application whitelisting policies that restrict execution of unauthorized binaries and maintain comprehensive system logging to detect potential exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and execution through local system services, with the exploitation pathway representing a classic example of how service discovery mechanisms can be weaponized for system compromise. The vulnerability highlights the importance of secure coding practices and proper input validation in network service implementations, particularly in widely-deployed system components that operate with elevated privileges.