CVE-1999-0676 in Solaris
Summary
by MITRE
sdtcm_convert in Solaris 2.6 allows a local user to overwrite sensitive files via a symlink attack.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability identified as CVE-1999-0676 resides within the sdtcm_convert utility in Solaris 2.6 operating systems, representing a classic symlink attack vector that exploits improper file handling mechanisms. This flaw specifically targets the way the utility processes symbolic links during file conversion operations, creating a pathway for local users to manipulate the system's file structure. The vulnerability operates under CWE-59, which classifies it as a "Improper Link Resolution" issue, where the system fails to properly validate symbolic links before processing them. The sdtcm_convert utility, designed for converting data files, demonstrates a critical oversight in its implementation that allows attackers to substitute legitimate files with symbolic links pointing to sensitive system files, thereby enabling unauthorized modifications.
The technical exploitation of this vulnerability occurs when a local user creates a malicious symbolic link that mimics the expected file path during the conversion process. When the sdtcm_convert utility encounters this symlink, it follows the link and writes data to the target file instead of the intended destination, potentially overwriting critical system files or configuration data. This represents a privilege escalation vector where a local user can gain elevated access to sensitive file systems through indirect manipulation of the file conversion process. The vulnerability is particularly concerning because it requires no special privileges beyond local access and can be exploited through simple file system manipulation techniques. The attack pattern aligns with ATT&CK technique T1068, which covers "Local Privilege Escalation" through exploitation of system vulnerabilities, and specifically targets the principle of least privilege by allowing unauthorized file modification.
The operational impact of CVE-1999-0676 extends beyond simple file corruption, as it can lead to complete system compromise through manipulation of critical system files. Attackers could potentially overwrite configuration files, system binaries, or security-related data that would compromise the integrity of the entire Solaris 2.6 environment. The vulnerability's persistence across multiple system components makes it particularly dangerous, as it affects not only the immediate utility but also the broader file system security model. System administrators face the challenge of identifying and mitigating such issues without disrupting legitimate system operations, as the vulnerability operates at a fundamental level of file system interaction. The flaw demonstrates a lack of proper input validation and file access controls that should be inherent to secure system design practices.
Mitigation strategies for CVE-1999-0676 require immediate implementation of system updates and patches provided by Sun Microsystems, as the vulnerability was specifically addressed through security updates for Solaris 2.6. Organizations should implement strict file system permissions and ensure that symbolic link resolution is properly validated before any file operations occur. The recommended approach includes disabling or restricting access to the sdtcm_convert utility for non-privileged users, implementing proper file system auditing, and ensuring that all file operations within the system validate the actual file paths rather than following symbolic links. System hardening measures should include regular vulnerability assessments and ensuring that all system utilities properly implement secure file handling practices. The vulnerability serves as a reminder of the importance of proper file system security controls and the necessity of implementing robust input validation mechanisms in all system utilities. Organizations should also consider implementing monitoring solutions that can detect anomalous file system activities that may indicate symlink attack attempts, particularly in environments where legacy systems remain operational.