CVE-1999-0069 in Solaris
Summary
by MITRE
Solaris ufsrestore buffer overflow.
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Analysis
by VulDB Data Team • 04/17/2026
The vulnerability identified as CVE-1999-0069 represents a critical buffer overflow flaw within the Solaris ufsrestore utility, a component of Sun Microsystems' Solaris operating system. This issue specifically affects the Unix File System (UFS) restore functionality that administrators use to recover data from backup images. The buffer overflow occurs when the ufsrestore utility processes certain malformed input data during the restoration process, creating a potential pathway for malicious exploitation that could compromise the entire system.
The technical implementation of this vulnerability stems from insufficient bounds checking within the ufsrestore command's handling of file names and directory paths during the restoration procedure. When processing backup data containing overly long file names or specially crafted directory structures, the utility fails to validate input lengths against predetermined buffer limits, allowing attackers to overwrite adjacent memory locations. This flaw directly maps to CWE-121, which describes stack-based buffer overflow conditions where insufficient validation permits data to overwrite adjacent memory segments, potentially leading to arbitrary code execution.
The operational impact of CVE-1999-0069 extends beyond simple data corruption, as it provides attackers with potential privilege escalation capabilities. Since ufsrestore typically operates with elevated privileges during system maintenance operations, successful exploitation could allow malicious actors to execute arbitrary code with root-level permissions. This represents a significant concern for system administrators who rely on the utility for critical backup and recovery operations, particularly in enterprise environments where Solaris systems handle sensitive data and mission-critical applications. The vulnerability aligns with ATT&CK technique T1068, which involves exploiting legitimate credentials and system utilities to gain elevated privileges.
System administrators should implement immediate mitigations including applying the relevant Solaris patches released by Sun Microsystems, which address the buffer overflow by implementing proper input validation and bounds checking mechanisms. Additionally, restricting access to the ufsrestore utility through proper file permissions and implementing principle of least privilege configurations can significantly reduce exploitation risk. Network segmentation and monitoring of backup operations can help detect potential exploitation attempts, while regular security assessments should verify that no unauthorized modifications exist in critical system utilities. The vulnerability demonstrates the importance of maintaining up-to-date system patches and proper input validation in system utilities that handle user-supplied data, particularly those with elevated privileges. Organizations should also consider implementing automated patch management solutions to ensure timely deployment of security updates across all Solaris installations.