CVE-2008-1638 in Nik Sharpener Pro
Summary
by MITRE
Nik Sharpener Pro, possibly 2.0, uses world-writable permissions for plug-in files, which allows local users to gain privileges by replacing a plug-in with a Trojan horse.
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Analysis
by VulDB Data Team • 11/28/2024
The vulnerability described in CVE-2008-1638 represents a critical privilege escalation flaw in Nik Sharpener Pro software version 2.0 and potentially earlier releases. This issue stems from improper file permission settings that create exploitable conditions within the application's plugin architecture. The software grants world-writable permissions to its plugin files, meaning any local user can modify or replace these components with malicious substitutes. This fundamental misconfiguration creates a pathway for attackers to elevate their system privileges through the manipulation of trusted software components. The vulnerability is particularly concerning because it leverages the principle of least privilege violation, where system components that should remain protected are instead accessible for modification by any user account. This flaw directly impacts the integrity of the software ecosystem and creates opportunities for persistent malicious access.
The technical implementation of this vulnerability involves the software's failure to properly enforce access controls on its plugin directory structure. When Nik Sharpener Pro loads plugins, it typically executes code from these files with elevated privileges, especially when the software runs with administrative permissions. The world-writable permissions allow local attackers to substitute legitimate plugin files with Trojan horse implementations that contain malicious code. This attack vector operates under the assumption that the software will execute any plugin file it encounters without proper validation of the file's integrity or origin. The exploitation process typically involves creating a malicious plugin file with the same name as a legitimate plugin, placing it in the appropriate directory, and then triggering the software to load the modified component. This technique falls under the category of privilege escalation through file system manipulation and represents a classic example of insecure permissions in software design.
The operational impact of CVE-2008-1638 extends beyond simple local privilege escalation to potentially enable more sophisticated attacks within a compromised system. Once an attacker gains elevated privileges through this vulnerability, they can perform actions such as installing additional malware, modifying system configurations, accessing sensitive data, or establishing persistent backdoors. The vulnerability is particularly dangerous in multi-user environments where less privileged accounts exist, as it allows attackers to bypass normal access controls and escalate their privileges without requiring additional attack vectors. The impact is further amplified because the vulnerability requires no special network access or complex exploitation techniques, making it highly accessible to attackers with basic local system access. This characteristic aligns with ATT&CK technique T1068, which describes privilege escalation through local exploits, and demonstrates how seemingly minor permission configurations can create significant security risks. The vulnerability also relates to CWE-732, which covers inadequate permissions for critical resources, and CWE-276, which addresses incorrect permissions for critical resources.
Mitigation strategies for CVE-2008-1638 must address the core issue of improper file permissions within the application's plugin architecture. System administrators should immediately correct the file permissions on plugin directories to restrict write access to only authorized users and processes. The recommended approach involves setting appropriate ownership and permissions that prevent local users from modifying critical plugin files while maintaining the software's intended functionality. Organizations should also implement regular security audits to identify and correct similar permission issues in other software components. The remediation process should include ensuring that plugin directories are not world-writable and that only the software process and authorized administrators have write permissions. Additionally, system monitoring should be enhanced to detect unauthorized modifications to plugin files, which can serve as an early warning system for potential exploitation attempts. The vulnerability highlights the importance of principle of least privilege enforcement and proper access control implementation in software design, making it a critical consideration for system hardening efforts and compliance with security frameworks such as NIST SP 800-53. Organizations should also consider implementing application whitelisting solutions to prevent unauthorized plugin execution, which provides an additional layer of protection against similar vulnerabilities in the future.