CVE-2005-4797 in Solaris
Summary
by MITRE
Directory traversal vulnerability in printd line printer daemon (lpd) in Solaris 7 through 10 allows remote attackers to delete arbitrary files via ".." sequences in an "Unlink data file" command.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/31/2024
The directory traversal vulnerability identified as CVE-2005-4797 affects the printd line printer daemon (lpd) service running on Solaris 7 through 10 operating systems. This flaw resides in the handling of file operations within the lpd service, specifically when processing commands related to unlinking data files. The vulnerability stems from insufficient input validation and path resolution mechanisms that fail to properly sanitize user-supplied data containing directory traversal sequences. Attackers can exploit this weakness by crafting malicious "Unlink data file" commands that include ".." sequences, which when processed by the vulnerable lpd service, can traverse the file system hierarchy to access and delete files outside of the intended directory boundaries. This represents a classic path traversal vulnerability that allows unauthorized file system access and manipulation.
The technical implementation of this vulnerability occurs within the lpd service's command processing logic where it fails to validate or sanitize the file paths provided in the unlink command. When an attacker sends a specially crafted command containing ".." sequences, the lpd service processes these sequences without proper boundary checking, allowing the traversal to occur. The flaw is particularly dangerous because it operates at the system level where the lpd service typically runs with elevated privileges, potentially enabling attackers to delete critical system files, configuration files, or other sensitive data. This vulnerability aligns with CWE-22, which categorizes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The attack vector is remote, meaning an attacker can exploit this vulnerability without requiring physical access to the system, making it particularly concerning for networked environments.
The operational impact of CVE-2005-4797 extends beyond simple file deletion capabilities to encompass potential system compromise and denial of service conditions. An attacker who successfully exploits this vulnerability can cause significant disruption by deleting critical system files, potentially leading to system instability or complete system failure. The vulnerability can also be leveraged as a stepping stone for further attacks, as attackers might delete configuration files to disable services or manipulate system components. Additionally, the ability to delete arbitrary files can result in data loss, compromise of system integrity, and potential information disclosure if sensitive files are removed. This vulnerability affects the availability and integrity of the system, as it can be used to cause denial of service by removing essential system components. The impact is particularly severe in enterprise environments where print services are critical for business operations, as it can lead to complete disruption of printing capabilities and potential cascading failures.
Mitigation strategies for CVE-2005-4797 should focus on immediate patching and system hardening measures. Oracle released security patches for Solaris 7 through 10 that address this vulnerability by implementing proper input validation and path traversal prevention mechanisms within the lpd service. Organizations should prioritize applying these patches to all affected systems immediately. Network segmentation and access control measures should be implemented to limit exposure of the lpd service to trusted networks only. The principle of least privilege should be enforced by running the lpd service with minimal required permissions and avoiding execution with root privileges. Input validation should be strengthened at all service interfaces to prevent malformed path sequences from being processed. Additionally, monitoring and logging should be enhanced to detect suspicious unlink operations and potential exploitation attempts. The vulnerability demonstrates the importance of secure coding practices and proper input validation as outlined in the ATT&CK framework under the technique of privilege escalation and persistence. System administrators should also consider disabling unnecessary print services and implementing network access controls to limit potential attack vectors. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other system components and ensure comprehensive protection against path traversal attacks.