CVE-2015-1816 in Forman
Summary
by MITRE
Forman before 1.7.4 does not verify SSL certificates for LDAP connections, which allows man-in-the-middle attackers to spoof LDAP servers via a crafted certificate.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 06/12/2022
The vulnerability identified as CVE-2015-1816 affects Forman versions prior to 1.7.4 and represents a critical security flaw in the handling of LDAP connections through SSL/TLS encryption. This weakness stems from the application's failure to properly validate SSL certificates during the establishment of secure communication channels with LDAP servers. The vulnerability creates a significant attack surface that enables malicious actors to perform man-in-the-middle attacks by presenting forged SSL certificates that appear legitimate to the vulnerable application.
This security flaw directly relates to CWE-295, which specifically addresses improper certificate validation in secure communications. The vulnerability operates at the transport layer security validation point where applications should verify the authenticity of SSL certificates presented by servers they connect to. When Forman fails to perform this verification, it essentially trusts any certificate presented, regardless of its legitimacy or whether it was issued by a trusted certificate authority. This behavior fundamentally undermines the security model of SSL/TLS encryption and creates an environment where attackers can seamlessly impersonate legitimate LDAP servers.
The operational impact of this vulnerability extends beyond simple credential theft, as it enables attackers to intercept, modify, or redirect all LDAP traffic between the vulnerable application and the directory services. This includes sensitive authentication data, user information, and potentially access control information that flows through LDAP connections. The attack scenario involves an attacker positioned between the Forman application and the LDAP server, capable of presenting a malicious certificate that will be accepted without proper validation. This allows the attacker to establish a trusted connection with the application while simultaneously maintaining their own connection to the legitimate LDAP server, creating a transparent interception point.
From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1071.004, which involves application layer protocol manipulation and network protocol manipulation. Attackers can exploit this weakness to conduct credential harvesting, escalate privileges, or perform reconnaissance activities against the underlying directory services. The vulnerability is particularly dangerous in enterprise environments where LDAP is commonly used for authentication and authorization services, as it can provide attackers with access to critical identity infrastructure. The attack requires minimal sophistication, as it leverages the inherent trust model of SSL/TLS connections without requiring advanced cryptographic attacks or complex exploitation techniques.
The recommended mitigation strategy involves upgrading Forman to version 1.7.4 or later, which contains the necessary certificate validation enhancements. Organizations should also implement additional network-level protections such as certificate pinning, where specific certificate fingerprints are hardcoded into the application to prevent acceptance of unauthorized certificates. Network segmentation and monitoring solutions should be deployed to detect unusual LDAP traffic patterns that might indicate man-in-the-middle activity. Security teams should also review and strengthen their certificate management practices, ensuring that only trusted certificates are used in production environments and that certificate revocation checking mechanisms are properly configured. Additionally, implementing network intrusion detection systems that can identify and alert on suspicious SSL certificate exchanges will provide additional layers of defense against exploitation attempts.