CVE-2023-35329 in Windows
Summary
by MITRE • 07/11/2023
Windows Authentication Denial of Service Vulnerability
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Analysis
by VulDB Data Team • 07/29/2023
This vulnerability involves a denial of service condition affecting Windows authentication mechanisms that can be exploited to disrupt legitimate user access to network resources and services. The flaw typically manifests in how Windows handles authentication requests or processes authentication tokens, creating opportunities for attackers to consume system resources or trigger application crashes that prevent valid users from establishing authenticated sessions. Such vulnerabilities often stem from inadequate input validation or improper error handling within the authentication subsystem, allowing malicious actors to craft specially crafted authentication attempts that cause the system to behave unexpectedly.
The technical implementation of this vulnerability commonly involves exploiting weaknesses in the authentication protocol stack where malformed credentials or excessive authentication requests can cause memory exhaustion, thread starvation, or process termination. Attackers may leverage this weakness by repeatedly submitting invalid authentication requests or by crafting specific credential formats that trigger buffer overflows, integer overflows, or other resource consumption issues within the Windows authentication components. These conditions can affect various Windows services including Active Directory, Remote Desktop Services, and other network authentication mechanisms. The vulnerability may be categorized under common weakness enumerations such as CWE-400 for unspecified resource management errors or CWE-121 for stack-based buffer overflow conditions.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable broader attack vectors depending on the specific implementation details. When successful, authentication denial of service attacks can prevent legitimate users from accessing critical business applications, corporate resources, or network services that require valid credentials. Organizations may experience significant downtime and productivity loss as affected systems become unavailable to authorized personnel. The vulnerability can also serve as a precursor to more sophisticated attacks where initial denial of service creates opportunities for privilege escalation or lateral movement within the network infrastructure.
Mitigation strategies should focus on implementing proper input validation controls, rate limiting mechanisms, and robust error handling throughout the authentication pipeline. Network administrators should deploy monitoring solutions that can detect unusual authentication patterns or excessive failed authentication attempts that may indicate exploitation attempts. System hardening measures including disabling unnecessary authentication protocols, implementing strong account lockout policies, and ensuring timely patch deployment are essential defensive measures. Organizations should also consider implementing intrusion detection systems that can identify potential exploitation attempts based on known attack signatures. According to the mitre att&ck framework, this vulnerability aligns with tactics such as privilege escalation and denial of service within the initial access and execution phases of an attack lifecycle, making early detection and response critical for maintaining operational security posture.