CVE-2000-0337 in Solaris
Summary
by MITRE
Buffer overflow in Xsun X server in Solaris 7 allows local users to gain root privileges via a long -dev parameter.
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Analysis
by VulDB Data Team • 01/18/2025
The vulnerability described in CVE-2000-0337 represents a critical buffer overflow flaw within the Xsun X server component of Solaris 7 operating systems. This issue specifically manifests when the X server processes command-line arguments, particularly the -dev parameter, which is used to specify device files for display management. The flaw occurs due to insufficient input validation and bounds checking in the argument parsing routine, allowing malicious input to overwrite adjacent memory locations beyond the allocated buffer space. The vulnerability is classified as a local privilege escalation vector since it requires local system access but can be exploited to elevate privileges from regular user level to root access, making it particularly dangerous in multi-user environments where users might attempt to exploit this weakness for unauthorized system control.
The technical implementation of this buffer overflow stems from improper handling of command-line parameters within the Xsun X server daemon. When a user provides an excessively long -dev parameter, the server fails to properly validate the input length before copying it into a fixed-size buffer. This classic buffer overflow condition allows an attacker to overwrite the return address on the stack or other critical program variables, potentially enabling arbitrary code execution. The vulnerability operates under CWE-121 which categorizes buffer overflow conditions as a fundamental weakness in software design, while also aligning with ATT&CK technique T1068 which describes local privilege escalation through software vulnerabilities. The specific nature of this flaw makes it particularly attractive to attackers as it requires minimal privileges to exploit and can result in complete system compromise.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can lead to complete system takeover and persistent access for malicious actors. Once a local user successfully exploits this buffer overflow, they can gain root privileges and subsequently access all system resources, modify critical files, install backdoors, or exfiltrate sensitive data. The vulnerability is particularly concerning in enterprise environments where Solaris 7 systems may be running with default configurations and where users have legitimate access to the system but lack proper privilege controls. Organizations running affected systems face significant risk of unauthorized access, data breaches, and potential lateral movement within their network infrastructure. The impact is amplified by the fact that many systems may not have proper monitoring in place to detect unusual X server behavior or unauthorized privilege escalation attempts, making detection difficult and post-exploitation activities more challenging to trace.
Mitigation strategies for CVE-2000-0337 should include immediate patching of the affected Solaris 7 systems with the appropriate security updates from Oracle. System administrators should also implement strict input validation controls and parameter sanitization for all X server operations, particularly around device parameter handling. Network segmentation and privilege separation measures can help limit the potential impact of successful exploitation by reducing the attack surface. Additionally, monitoring should be enhanced to detect abnormal X server behavior, including unexpected privilege escalation events or unusual command-line parameter usage. Security configurations should enforce mandatory access controls and audit all X server activities to provide visibility into potential exploitation attempts. Organizations should also consider implementing intrusion detection systems that can identify patterns associated with buffer overflow exploitation attempts, while maintaining regular security assessments to identify and remediate similar vulnerabilities in other system components. The remediation process should include comprehensive system hardening measures and regular security updates to prevent similar vulnerabilities from being introduced through future software modifications.