CVE-2001-1066 in Communicator
Summary
by MITRE
ns6install installation script for Netscape 6.01 on Solaris, and other versions including 6.2.1 beta, allows local users to overwrite arbitrary files via a symlink attack.
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Analysis
by VulDB Data Team • 07/08/2014
The vulnerability described in CVE-2001-1066 represents a critical security flaw in the ns6install installation script distributed with Netscape 6.01 and related versions on Solaris operating systems. This issue stems from improper handling of symbolic links during the software installation process, creating a path traversal condition that enables local attackers to manipulate file permissions and overwrite arbitrary system files. The vulnerability specifically affects the installation script's failure to properly validate or sanitize symbolic link references, allowing malicious users to exploit this weakness for privilege escalation and system compromise. The flaw exists within the installation framework itself rather than the application being installed, making it particularly dangerous as it can be leveraged during routine software deployment operations. This type of vulnerability falls under the category of insecure file handling and path manipulation, which are commonly exploited in privilege escalation attacks. The impact is significant because it allows local users to potentially overwrite critical system files, configuration files, or even binaries that could lead to persistent access or system instability. The vulnerability demonstrates a fundamental lack of proper access control validation in the installation process, as the script does not adequately verify the integrity of file paths before performing write operations.
The technical exploitation of this vulnerability relies on the attacker creating malicious symbolic links in directories where the installation script expects to find certain files or directories. When the ns6install script processes these symbolic links, it follows them without proper validation and proceeds to overwrite the target files that the symbolic links point to. This creates a classic symlink attack scenario where the attacker can redirect file operations to any location on the system. The attack vector is particularly effective because installation scripts often run with elevated privileges to ensure proper system integration, making the potential damage from such an attack significantly greater than typical user-level exploits. The vulnerability is classified as a path traversal issue and aligns with CWE-367, which addresses the improper handling of symbolic links during file operations. The flaw also relates to CWE-22, which covers path traversal vulnerabilities, and CWE-73, which addresses the improper control of a resource through a link. From an operational perspective, this vulnerability represents a serious concern for system administrators who may not be aware of the potential for such attacks during routine software installations, especially when installing software from third-party vendors or when using automated deployment processes.
The operational impact of CVE-2001-1066 extends beyond simple file overwriting, as it can enable attackers to modify critical system components that maintain system integrity and security. An attacker could potentially overwrite system binaries, configuration files, or even create backdoors that persist across system reboots. The vulnerability is particularly dangerous in enterprise environments where software deployment scripts are often automated and may run with root privileges. The attack requires local access to the system, but this is often achievable through various means such as compromised user accounts, social engineering, or other initial access vectors. The exploitation process is relatively straightforward, requiring only the ability to create symbolic links in specific directories and then execute the vulnerable installation script. This makes the vulnerability particularly concerning from a security management perspective, as it can be leveraged by insiders or attackers who have gained local access to a system. The vulnerability also highlights the importance of proper input validation and file path handling in system administration tools, as the issue stems from the installation script's failure to properly sanitize file operations. Organizations should consider implementing additional security controls around installation processes, including privilege separation, file integrity monitoring, and proper access controls to prevent unauthorized file modifications. The vulnerability also serves as a reminder of the importance of secure coding practices in system administration tools, particularly those that handle file operations with elevated privileges. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be categorized under T1068, which covers the exploitation of remote services for privilege escalation. The vulnerability also relates to T1546, which addresses the creation of persistence mechanisms through modification of system files or installation scripts, making it a particularly dangerous flaw for maintaining long-term access to compromised systems.