CVE-2008-4114 in Windows
Summary
by MITRE
srv.sys in the Server service in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2, Vista Gold and SP1, and Server 2008 allows remote attackers to cause a denial of service (system crash) or possibly have unspecified other impact via an SMB WRITE_ANDX packet with an offset that is inconsistent with the packet size, related to "insufficiently validating the buffer size," as demonstrated by a request to the \PIPE\lsarpc named pipe, aka "SMB Validation Denial of Service Vulnerability."
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Analysis
by VulDB Data Team • 11/04/2024
The CVE-2008-4114 vulnerability represents a critical buffer validation flaw within the Server service of Microsoft Windows operating systems, affecting a wide range of platforms including Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2, Vista Gold and SP1, and Server 2008. This vulnerability specifically targets the srv.sys driver component that handles Server Message Block protocol operations, creating a condition where malformed SMB WRITE_ANDX packets can trigger system instability. The flaw occurs when the Server service processes an SMB request containing an inconsistent offset relative to the packet size, particularly when targeting the \PIPE\lsarpc named pipe which is used for remote security operations. The vulnerability stems from insufficient validation of buffer parameters during SMB packet processing, allowing attackers to craft malicious packets that exploit the lack of proper bounds checking in the server service implementation.
The technical exploitation of this vulnerability demonstrates a classic buffer overflow condition where the server service fails to properly validate the relationship between packet offset values and available buffer space. When an attacker sends a specially crafted SMB WRITE_ANDX packet with an offset that exceeds the actual packet boundaries, the system's memory management routines can become corrupted, leading to system crashes or potential privilege escalation. The vulnerability is categorized under CWE-129 as "Improper Validation of Array Index" and aligns with ATT&CK technique T1210 for "Exploitation of Remote Services" and T1068 for "Exploitation for Privilege Escalation." The specific impact manifests through the Server service's failure to validate the buffer size parameter against the actual packet structure, creating a scenario where memory corruption occurs during packet processing.
From an operational standpoint, this vulnerability presents significant risk to enterprise environments as it allows remote attackers to execute denial of service attacks against critical file and print servers without requiring authentication. The attack vector through SMB protocol means that systems are vulnerable to exploitation from any network location where the service is accessible, making it particularly dangerous in corporate environments where file servers are exposed to external networks. The potential for unspecified additional impacts suggests that while the primary effect is system crash, there may also be opportunities for privilege escalation or information disclosure depending on the system configuration and attack circumstances. Organizations running affected Windows versions are particularly vulnerable as the Server service is commonly enabled and exposed, creating multiple attack surfaces for adversaries to target.
Mitigation strategies for CVE-2008-4114 should prioritize immediate patch deployment through Microsoft's security updates, as the vulnerability was addressed through the Windows Update mechanism with specific security patches for each affected platform. Network segmentation and firewall rules should be implemented to restrict SMB traffic to trusted networks only, particularly blocking access to the Server service on port 445 and port 139 from untrusted sources. System administrators should disable unnecessary file sharing services and ensure that the \PIPE\lsarpc named pipe access is restricted to authorized users only. Monitoring should be implemented to detect anomalous SMB traffic patterns and potential exploitation attempts. The vulnerability highlights the importance of proper input validation and buffer management in server-side applications, serving as a reminder of the critical need for robust security practices in network service implementations. Organizations should also consider implementing intrusion detection systems to monitor for known attack signatures associated with SMB protocol exploitation attempts.