CVE-2005-3170 in Windows
Summary
by MITRE
The LDAP client on Microsoft Windows 2000 before Update Rollup 1 for SP4 accepts certificates using LDAP Secure Sockets Layer (LDAPS) even when the Certificate Authority (CA) is not trusted, which could allow attackers to trick users into believing that they are accessing a trusted site.
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Analysis
by VulDB Data Team • 12/05/2024
The vulnerability described in CVE-2005-3170 represents a critical certificate validation flaw in the Lightweight Directory Access Protocol client implementation on Microsoft Windows 2000 systems. This issue specifically affects the_LDAPS_ protocol behavior where the client fails to properly validate certificate authorities, creating a significant security gap that could be exploited by malicious actors. The flaw exists in the certificate trust validation process that occurs during secure LDAP connections, allowing certificates issued by untrusted certificate authorities to be accepted as valid for authentication purposes.
This vulnerability operates at the core of SSL/TLS certificate validation mechanisms, where the Windows 2000 LDAP client implementation does not properly enforce certificate chain validation against the local trusted root certificate store. The technical flaw stems from the client's failure to perform adequate certificate authority verification during LDAPS connections, enabling attackers to present certificates signed by rogue or untrusted CAs that would normally be rejected by proper certificate validation procedures. This behavior violates fundamental security principles of certificate-based authentication and trust establishment.
The operational impact of this vulnerability is substantial as it enables man-in-the-middle attacks and phishing scenarios where attackers can create convincing fake LDAP servers that appear to be legitimate trusted systems. An attacker could exploit this weakness by setting up a malicious LDAP server with a certificate signed by an untrusted CA, potentially capturing credentials or gaining unauthorized access to directory services. This vulnerability particularly affects enterprise environments where Windows 2000 systems may still be operational and connected to LDAP services, creating potential entry points for adversaries seeking to compromise directory-based authentication systems.
Organizations affected by this vulnerability should implement immediate mitigations including applying Update Rollup 1 for Windows 2000 Service Pack 4, which addresses the certificate validation issue by enforcing proper CA trust validation. Additional protective measures include configuring certificate trust policies to explicitly disable untrusted certificate authorities, implementing network segmentation to limit LDAP access, and monitoring for suspicious certificate usage patterns. This vulnerability aligns with CWE-295 which addresses improper certificate validation and relates to ATT&CK technique T1552.001 for credentials from password storage, as compromised LDAP access could provide attackers with directory credentials and access to sensitive organizational information. The flaw demonstrates the critical importance of proper certificate validation in secure communication protocols and highlights the risks associated with legacy system maintenance and patch management.