CVE-2008-6560 in CMAN
Summary
by MITRE
Buffer overflow in CMAN - The Cluster Manager before 2.03.09-1 on Fedora 9 and Red Hat Enterprise Linux (RHEL) 5 allows attackers to cause a denial of service (CPU consumption and memory corruption) via a cluster.conf file with many lines. NOTE: it is not clear whether this issue crosses privilege boundaries in realistic uses of the product.
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Analysis
by VulDB Data Team • 05/25/2025
The vulnerability identified as CVE-2008-6560 represents a critical buffer overflow flaw within the Cluster Manager (CMAN) component of enterprise Linux distributions. This issue affects versions prior to 2.03.09-1 on Fedora 9 and Red Hat Enterprise Linux 5 systems, where the cluster configuration file processing mechanism fails to properly validate input lengths. The flaw manifests when the system processes a maliciously crafted cluster.conf file containing an excessive number of lines, creating a condition where memory allocation boundaries are exceeded. This buffer overflow vulnerability resides in the core cluster management functionality that handles configuration file parsing and processing, making it a fundamental security weakness in distributed computing environments.
The technical implementation of this vulnerability stems from inadequate input validation within the CMAN component's configuration file parser. When processing cluster.conf files, the system allocates fixed-size buffers to store configuration data without proper bounds checking on the number of lines or total data length. This allows an attacker to craft a configuration file with an excessive number of entries that exceed the allocated buffer space, causing memory corruption and potentially leading to arbitrary code execution. The vulnerability specifically targets the memory management routines responsible for handling cluster configuration data, where the lack of proper input sanitization creates a predictable overflow condition. According to CWE classification, this represents a classic buffer overflow vulnerability (CWE-121) with potential for privilege escalation and system compromise.
The operational impact of CVE-2008-6560 extends beyond simple denial of service to encompass potential system instability and resource exhaustion. Attackers can exploit this vulnerability by submitting malformed cluster configuration files that cause the CMAN process to consume excessive CPU cycles and memory resources, effectively creating a resource exhaustion attack. The memory corruption aspect of this vulnerability introduces additional risks including system crashes, unpredictable behavior, and potential privilege escalation scenarios. In clustered environments where CMAN manages critical infrastructure components, this vulnerability can lead to complete service disruption and compromise the availability of mission-critical applications. The attack vector is particularly concerning because it can be executed without requiring elevated privileges, potentially allowing unauthenticated attackers to disrupt cluster operations.
Mitigation strategies for CVE-2008-6560 should focus on immediate patch deployment and configuration hardening measures. Organizations must upgrade to CMAN version 2.03.09-1 or later to address the buffer overflow vulnerability, as this represents the official fix provided by Red Hat and Fedora security teams. Additionally, implementing strict input validation controls on cluster configuration files, limiting the maximum number of lines allowed in cluster.conf files, and establishing monitoring for unusual resource consumption patterns can help detect and prevent exploitation attempts. Network segmentation and access controls should be implemented to restrict who can submit configuration changes to cluster management systems. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and denial of service, with potential for lateral movement within clustered environments where attackers could leverage the compromised CMAN service to gain further access to connected systems.