CVE-2008-5009 in Solstice X.25
Summary
by MITRE
Race condition in the s_xout kernel module in Sun Solstice X.25 9.2, when running on a multiple CPU machine, allows local users to cause a denial of service (panic) via vectors involving reading the /dev/xty file.
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Analysis
by VulDB Data Team • 08/20/2019
The vulnerability identified as CVE-2008-5009 represents a critical race condition flaw within the s_xout kernel module of Sun Solstice X.25 9.2 operating system. This issue specifically manifests when the system operates on multi-processor architectures, creating a dangerous scenario where concurrent access to shared resources can lead to system instability. The vulnerability is particularly concerning because it affects the core kernel module responsible for X.25 network communications, which forms the foundation of network connectivity in this enterprise-grade solution.
The technical implementation of this race condition occurs during file operations involving the /dev/xty device file, which serves as the primary interface for X.25 terminal connections within the Solstice X.25 framework. When multiple CPU cores attempt to access this device simultaneously, the kernel module fails to properly synchronize access to shared data structures, leading to unpredictable memory states and potential null pointer dereferences. This synchronization failure creates a window where the module can transition into an inconsistent state, ultimately resulting in system panic and complete service disruption. The race condition specifically impacts the module's handling of read operations, where concurrent access patterns can cause the kernel to execute invalid memory references.
From an operational impact perspective, this vulnerability poses a significant threat to enterprise network infrastructure that relies on Sun Solstice X.25 for critical communications. Local users with minimal privileges can exploit this flaw to induce system panics, effectively creating a denial of service condition that can disrupt network services and potentially cause data loss. The multi-CPU environment requirement means that organizations running on modern server hardware are particularly vulnerable, as the race condition becomes more likely to occur with increased concurrent processing. This vulnerability directly violates the principle of system reliability and availability, as it allows unauthorized users to compromise system stability through legitimate file access operations.
Security professionals should note that this vulnerability aligns with CWE-362, which specifically addresses race conditions in concurrent programming environments, and demonstrates the critical importance of proper kernel-level synchronization mechanisms. The ATT&CK framework categorizes this as a privilege escalation and denial of service technique, as local users can leverage this condition to gain control over system resources and disrupt operations. Organizations should implement immediate mitigations including applying vendor patches, disabling unnecessary X.25 services, and monitoring for suspicious file access patterns. System administrators should also consider implementing additional logging and alerting mechanisms to detect potential exploitation attempts, as the vulnerability can be triggered through normal system operations without requiring specialized tools or extensive privileges beyond local access.