CVE-2000-0526 in Mailstudio 2000
Summary
by MITRE
mailview.cgi CGI program in MailStudio 2000 2.0 and earlier allows remote attackers to read arbitrary files via a .. (dot dot) attack.
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Analysis
by VulDB Data Team • 07/07/2024
The vulnerability identified as CVE-2000-0526 represents a critical directory traversal flaw in the mailview.cgi CGI program component of MailStudio 2000 version 2.0 and earlier. This issue stems from inadequate input validation within the web application's file handling mechanism, specifically affecting the mailview.cgi script that processes user requests for viewing email messages. The flaw allows malicious actors to manipulate file path parameters and access files outside the intended directory structure through the use of directory traversal sequences such as ".." or "%2e%2e" in the request parameters.
This vulnerability operates at the core of web application security by exploiting improper input sanitization and path validation techniques. The mailview.cgi script fails to properly validate user-supplied input that determines which email files to display, creating an opportunity for attackers to navigate the file system beyond the intended boundaries. When the application processes a request containing directory traversal sequences, it interprets these patterns as legitimate path navigation commands rather than malicious input, resulting in unauthorized file access. The vulnerability is classified under CWE-22 - Improper Limitation of a Pathname to a Restricted Directory and aligns with ATT&CK technique T1566.001 - Phishing with Malicious Attachments, as attackers can leverage this flaw to access sensitive email data or system files that should remain protected.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can enable attackers to access confidential email messages, system configuration files, user credentials stored in email formats, or other sensitive data that may be accessible through the mail server's file system. Attackers can potentially retrieve private keys, authentication tokens, or other critical system information by exploiting this flaw. The vulnerability affects the confidentiality and integrity of the mail server's data, as unauthorized users can read files that should be restricted to authorized personnel only. This issue particularly impacts organizations relying on MailStudio 2000 for email management, where the compromise of email data could lead to significant data breaches and potential regulatory violations.
Mitigation strategies for this vulnerability include immediate patching of the MailStudio 2000 application to version 2.1 or later, which contains the necessary security fixes to prevent directory traversal attacks. Organizations should implement proper input validation and sanitization techniques within the web application to reject or normalize any input containing directory traversal sequences. The principle of least privilege should be enforced by ensuring that the web application runs with minimal required permissions and that file access is properly restricted. Network segmentation and firewall rules can limit access to the vulnerable CGI script, while regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other web applications. Additionally, implementing web application firewalls and input validation controls can provide additional layers of protection against this class of attack, as outlined in the OWASP Top Ten security guidelines and NIST cybersecurity frameworks for web application security.