CVE-2017-17718 in net-ldap gem
Summary
by MITRE
The Net::LDAP (aka net-ldap) gem before 0.16.0 for Ruby has Missing SSL Certificate Validation.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 01/18/2023
The vulnerability identified as CVE-2017-17718 affects the Net::LDAP gem version 0.16.0 and earlier in the ruby programming language ecosystem. This issue represents a critical security flaw that undermines the fundamental security assurances provided by SSL/TLS certificate validation mechanisms. The vulnerability specifically targets the authentication and encryption processes used when establishing secure connections to ldap servers through ruby applications. The affected gem is widely utilized in enterprise environments for directory services integration and authentication management, making this vulnerability particularly concerning for organizations relying on ruby-based applications for their identity management infrastructure.
The technical flaw stems from the absence of proper SSL certificate validation within the Net::LDAP gem implementation. When applications utilize this gem to establish secure connections to ldap servers, they fail to verify the authenticity of the server certificates presented during the ssl handshake process. This missing validation creates a man-in-the-middle attack vector where malicious actors can intercept communications between ruby applications and ldap servers without detection. The vulnerability directly maps to CWE-295 which defines weaknesses related to improper certificate validation and certificate path validation failures. Without proper certificate verification, attackers can present fraudulent certificates and establish trusted connections to malicious ldap servers while legitimate applications continue to operate under the assumption that they are communicating with authorized endpoints.
The operational impact of this vulnerability extends beyond simple data interception to encompass complete compromise of authentication systems. Organizations using ruby applications that depend on the affected Net::LDAP gem face significant risks including unauthorized access to directory services, credential theft, and potential lateral movement within networks. The vulnerability affects applications that handle sensitive user authentication data, password management, and access control decisions. Attackers exploiting this flaw can gain access to user credentials stored in ldap directories, potentially leading to privilege escalation and unauthorized system access. The implications are particularly severe in enterprise environments where ldap servers serve as central authentication repositories for multiple applications and services, creating a single point of failure that can compromise entire organizational security postures.
Mitigation strategies for CVE-2017-17718 require immediate action to upgrade the Net::LDAP gem to version 0.16.0 or later, which includes proper SSL certificate validation. Organizations should conduct comprehensive inventory assessments to identify all ruby applications utilizing the affected gem and implement patch management procedures to ensure timely updates. System administrators should also consider implementing additional monitoring and logging mechanisms to detect potential exploitation attempts, as the vulnerability may not immediately trigger obvious alerts during normal operations. Security teams should review existing certificate management policies and ensure that all ldap server certificates are properly validated and maintained. The remediation process should include thorough testing of updated applications to ensure compatibility and proper functionality. This vulnerability aligns with ATT&CK technique T1552 which covers credentials theft through various means including interception and man-in-the-middle attacks, emphasizing the importance of maintaining secure communication channels in authentication systems. Organizations should also consider implementing network segmentation and additional security controls to reduce the attack surface and limit potential damage from successful exploitation attempts.