CVE-2002-0084 in Solaris
Summary
by MITRE
Buffer overflow in the fscache_setup function of cachefsd in Solaris 2.6, 7, and 8 allows local users to gain root privileges via a long mount argument.
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Analysis
by VulDB Data Team • 09/23/2025
The vulnerability identified as CVE-2002-0084 represents a critical buffer overflow flaw within the Solaris caching filesystem implementation that affects multiple versions of the operating system. This issue resides in the fscache_setup function of the cachefsd component, which serves as the core mechanism for managing cached file operations in Solaris environments. The flaw manifests when the system processes mount arguments, creating an opportunity for local attackers to exploit memory corruption vulnerabilities that can lead to privilege escalation. The vulnerability is particularly concerning because it allows a local user to elevate their privileges to root level, effectively compromising the entire system security posture.
The technical implementation of this buffer overflow stems from inadequate input validation within the fscache_setup function where the system fails to properly bounds-check mount arguments before processing them. When a local user provides a specially crafted long mount argument, the system's memory management routines overflow the allocated buffer space, potentially overwriting critical memory locations including return addresses and privilege control structures. This type of vulnerability aligns with CWE-121, which specifically addresses stack-based buffer overflow conditions, and represents a classic example of improper input validation that violates fundamental security principles. The flaw operates at the kernel level within the Solaris filesystem caching subsystem, making it particularly dangerous as it can be exploited without requiring network access or authentication.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete control over affected systems. Local users who can execute commands on the target system gain the ability to read, modify, or delete any file accessible to the system, effectively bypassing all traditional access controls. This represents a severe compromise of the principle of least privilege and can lead to data exfiltration, system disruption, or the establishment of persistent backdoors. The vulnerability affects Solaris versions 2.6, 7, and 8, which were widely deployed enterprise systems during the early 2000s, making the potential attack surface substantial. From an adversarial perspective, this vulnerability maps to ATT&CK technique T1068, which involves exploiting local system vulnerabilities to gain elevated privileges, and T1548.001, related to abuse of privilege escalation techniques.
Mitigation strategies for CVE-2002-0084 require immediate system hardening measures and security patches from Oracle. The primary recommendation involves applying the appropriate security patches released by Sun Microsystems for affected Solaris versions, which address the buffer overflow by implementing proper bounds checking and input validation. System administrators should also implement additional security controls including limiting local user privileges, monitoring for unusual mount operations, and conducting regular vulnerability assessments. The implementation of address space layout randomization and stack canaries could provide additional protection against exploitation attempts, though these are secondary mitigations. Organizations should also consider implementing network segmentation to limit local access and establish robust logging mechanisms to detect potential exploitation attempts. The vulnerability demonstrates the critical importance of input validation in kernel-level code and serves as a reminder of the necessity for thorough security testing of system components that handle user-provided data.