CVE-2001-0086 in Subscribe Me Lite
Summary
by MITRE
CGI Script Center Subscribe Me LITE 2.0 and earlier allows remote attackers to delete arbitrary mailing list users without authentication by directly calling subscribe.pl with the target address as a parameter.
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Analysis
by VulDB Data Team • 07/11/2019
The vulnerability described in CVE-2001-0086 represents a critical authorization flaw in CGI Script Center Subscribe Me LITE 2.0 and earlier versions that allows remote attackers to perform unauthorized user deletion operations. This issue stems from the absence of proper authentication mechanisms within the subscribe.pl script, which serves as the primary interface for mailing list management functions. The vulnerability specifically affects the deletion functionality of the mailing list system, where an attacker can directly manipulate the script parameters to target specific user addresses for removal from the mailing list without requiring any valid credentials or authorization.
The technical implementation of this vulnerability exploits a fundamental security weakness in the script's parameter handling and access control mechanisms. When the subscribe.pl script is invoked with specific parameters including a target email address, it processes the deletion request without verifying the identity or authorization status of the requester. This design flaw falls under the category of improper authorization as defined by CWE-285, where the application fails to properly validate that the user performing the action has the necessary permissions to execute the operation. The vulnerability demonstrates a classic case of insufficient input validation and access control enforcement, allowing attackers to bypass normal security controls through direct parameter manipulation.
The operational impact of this vulnerability extends beyond simple user account manipulation to potentially compromise the integrity and availability of mailing list services. An attacker could systematically target and remove legitimate users from mailing lists, disrupting communication channels and potentially causing service degradation. The vulnerability also poses risks to data privacy and system integrity since it enables unauthorized modification of user data without audit trails or logging of such activities. This type of flaw can be particularly damaging in environments where mailing lists serve as critical communication channels for business operations or community engagement, as it allows for unauthorized disruption of these services.
From a cybersecurity perspective, this vulnerability aligns with several ATT&CK tactics including privilege escalation and defense evasion, as attackers can exploit the lack of authentication to gain unauthorized access to system resources. The vulnerability also relates to the broader category of web application security flaws that have been consistently identified in security assessments over the years, highlighting the importance of implementing proper authentication and authorization controls in web-based applications. Organizations utilizing this software would be exposed to significant risk without proper mitigations, as the vulnerability can be exploited by anyone with access to the web server and knowledge of the script interface.
The recommended mitigations for this vulnerability include immediate implementation of proper authentication mechanisms within the subscribe.pl script, ensuring that all user management operations require valid credentials and authorization checks before execution. System administrators should also implement input validation and parameter sanitization to prevent direct parameter manipulation attacks. Additionally, access controls should be enforced through proper user role management and privilege separation, ensuring that only authorized administrators can perform deletion operations. Regular security audits and vulnerability assessments should be conducted to identify similar authorization flaws in other web applications, while also implementing comprehensive logging and monitoring to detect unauthorized access attempts to critical system functions. The vulnerability demonstrates the critical importance of following secure coding practices and implementing defense-in-depth strategies to protect against unauthorized system access and data manipulation.