Source: cve@mitre.org
The SunView (SunTools) selection_svc facility allows remote users to read files.
SunView's selection_svc facility contains a critical vulnerability allowing unauthenticated remote attackers to read arbitrary files on vulnerable systems. This flaw poses a significant risk of sensitive data disclosure and potential system compromise, impacting the confidentiality of critical information.
Step 1: Target Identification: The attacker identifies a system running SunView (SunTools) with the selection_svc service enabled.
Step 2: Malicious Request Crafting: The attacker constructs a specially crafted request to the selection_svc service. This request includes a file path of a target file the attacker wishes to read (e.g., /etc/passwd).
Step 3: Request Submission: The attacker sends the malicious request to the vulnerable selection_svc service.
Step 4: Service Processing: The selection_svc service receives the request and, due to the lack of proper input validation and access control, attempts to read the contents of the file specified in the request.
Step 5: File Reading and Response: The service reads the contents of the specified file (e.g., /etc/passwd) and returns the contents to the attacker, thus achieving information disclosure.
The vulnerability stems from a flaw in the SunView (SunTools) selection_svc service, specifically in how it handles requests for file selections. The service likely lacks proper input validation and access control checks when processing requests. This allows an attacker to craft a malicious request that specifies an arbitrary file path. The service, without verifying the user's permissions or the validity of the requested file, then proceeds to read the contents of the specified file and return it to the attacker. The root cause is a failure to implement robust access control and input validation, leading to an information disclosure vulnerability.
This vulnerability is likely attractive to attackers seeking to gain initial access or escalate privileges. While no specific APTs are directly linked to this CVE, the nature of the vulnerability (information disclosure) makes it a useful tool for reconnaissance and lateral movement. CISA KEV status: Not Listed
Network traffic analysis: Examine network traffic for unusual requests to the selection_svc service, especially those containing file paths.
Log analysis: Review system logs for errors or suspicious activity related to the selection_svc service, including attempts to access sensitive files.
File integrity monitoring: Monitor critical system files (e.g., /etc/passwd, /etc/shadow) for unauthorized modifications or access.
Host-based intrusion detection systems (HIDS): Implement HIDS rules to detect attempts to access sensitive files or unusual process behavior related to SunView.
Disable the selection_svc service if it is not required. This is the most effective mitigation if the service is not essential for the system's functionality.
Upgrade or patch SunView (SunTools) if patches are available. However, given the age of the vulnerability, patches may not be readily available.
Implement strong access control measures to restrict access to sensitive files and directories.
Implement network segmentation to limit the impact of a successful exploit.
Regularly scan systems for vulnerabilities and apply security updates promptly.
Consider using a Web Application Firewall (WAF) or other security appliances to filter malicious requests.