CVE-2009-2387 in OpenSolaris
Summary
by MITRE
Unspecified vulnerability in the proc filesystem in Sun OpenSolaris snv_49 through snv_109 allows local users to cause a denial of service (deadlock and panic) via unknown vectors, related to the ldt_rewrite_syscall function.
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Analysis
by VulDB Data Team • 11/18/2018
The vulnerability identified as CVE-2009-2387 resides within the proc filesystem implementation of Sun OpenSolaris operating systems ranging from release snv_49 through snv_109. This represents a critical security flaw that affects the fundamental system call handling mechanisms within the kernel, specifically targeting the ldt_rewrite_syscall function which manages local descriptor table rewrites. The proc filesystem serves as a virtual filesystem that provides an interface to kernel data structures, making it a critical component for system monitoring and process management operations. When exploited, this vulnerability creates a condition where local users can manipulate system resources in a manner that leads to system instability and complete system failure.
The technical nature of this vulnerability stems from improper handling within the ldt_rewrite_syscall function, which is responsible for managing changes to the local descriptor table that controls memory access permissions for processes. This function operates at the kernel level and interacts with the processor's memory management unit to modify access rights for different memory segments. The unspecified vectors that trigger this vulnerability likely involve race conditions or improper locking mechanisms within the kernel's memory management subsystem. These conditions can cause the kernel to enter a deadlock state where multiple system threads become permanently blocked waiting for resources that will never become available, ultimately leading to system panic and complete system crash.
The operational impact of CVE-2009-2387 extends beyond simple denial of service, as it represents a complete system compromise that can be leveraged by local attackers to disrupt critical system operations. This vulnerability is particularly dangerous in multi-user environments where local access is granted to untrusted users, as it allows attackers to systematically destabilize system services and potentially gain further privileges through subsequent exploitation attempts. The vulnerability affects system availability and reliability, making it a significant concern for enterprise environments that depend on stable system operations. From a cybersecurity perspective, this vulnerability aligns with CWE-119 which addresses improper access to memory and CWE-362 which covers race conditions, both of which are fundamental concepts in the Common Weakness Enumeration framework.
Attackers can exploit this vulnerability through local system access, making it particularly concerning for systems where local user privileges are not properly restricted or where privilege escalation mechanisms exist. The exploitation process likely involves crafting specific system calls that trigger the ldt_rewrite_syscall function in a manner that creates resource contention and deadlock conditions. This type of vulnerability is classified under the MITRE ATT&CK framework's privilege escalation and denial of service tactics, specifically targeting the system's kernel-level functionality. The vulnerability's impact is amplified by the fact that it affects the core kernel functionality that manages process memory access, making it a prime target for attackers seeking to gain system control or disrupt service availability.
Mitigation strategies for CVE-2009-2387 should include immediate patching of affected OpenSolaris systems to the latest available security updates from Sun Microsystems. Organizations should implement strict access controls to limit local user privileges and ensure that only authorized personnel have access to systems running vulnerable OpenSolaris versions. System monitoring should be enhanced to detect unusual patterns in system call usage that might indicate exploitation attempts. Additionally, regular security audits should be conducted to identify and remediate similar vulnerabilities within the kernel and system call interfaces. The vulnerability's classification as a kernel-level race condition emphasizes the importance of comprehensive system hardening measures and regular security updates to prevent exploitation. Organizations should also consider implementing intrusion detection systems that can monitor for suspicious kernel activity patterns and maintain detailed system logs for forensic analysis in case of successful exploitation attempts.