CVE-1999-1410 in IRIX
Summary
by MITRE
addnetpr in irix 5.3 and 6.2 allows local users to overwrite arbitrary files and possibly gain root privileges via a symlink attack on the printers temporary file.
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Analysis
by VulDB Data Team • 08/27/2024
The vulnerability identified as CVE-1999-1410 resides within the addnetpr utility of IRIX operating systems version 5.3 and 6.2, representing a classic symlink attack scenario that exploits insecure temporary file handling practices. This flaw specifically targets the printer configuration management component of the system, where the addnetpr utility creates temporary files without proper security checks that could be manipulated by local users to gain elevated privileges.
The technical implementation of this vulnerability stems from the improper handling of temporary files during printer setup operations. When addnetpr executes, it generates temporary files in predictable locations without verifying the existence or ownership of these files before writing to them. This insecure practice creates a race condition vulnerability where a local attacker can establish symbolic links in the temporary file path before the utility creates the actual file, effectively redirecting write operations to arbitrary locations on the filesystem.
The operational impact of this vulnerability extends beyond simple file overwriting to potential privilege escalation scenarios that could result in root access. An attacker exploiting this vulnerability can manipulate the temporary files to overwrite critical system binaries, configuration files, or even create malicious executables that will be executed with elevated privileges when the printer setup process completes. This represents a significant security risk as it allows local users to bypass normal access controls and potentially compromise the entire system.
This vulnerability aligns with CWE-377, which addresses insecure temporary file handling, and demonstrates characteristics consistent with ATT&CK technique T1068, which involves local privilege escalation through exploitation of system vulnerabilities. The attack vector specifically follows the pattern of symlink-based attacks that have been documented in various Unix-like systems where predictable temporary file names create opportunities for attackers to manipulate system behavior. The vulnerability highlights the importance of proper file access controls and the principle of least privilege in system design.
Mitigation strategies for this vulnerability should include immediate patching of affected IRIX versions, implementation of proper temporary file handling practices that use secure file creation methods such as open() with O_EXCL flag, and the application of file system permissions that prevent unauthorized symbolic link creation in temporary directories. System administrators should also implement monitoring for suspicious file creation patterns and consider restricting local user access to printer configuration utilities where possible. The vulnerability underscores the critical need for secure coding practices in system utilities and demonstrates how seemingly minor implementation flaws can create significant security risks in privileged system components.