CVE-2011-1248 in Windows
Summary
by MITRE
WINS in Microsoft Windows Server 2003 SP2 and Server 2008 Gold, SP2, R2, and R2 SP1 does not properly handle socket send exceptions, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted packets, related to unintended stack-frame values and buffer passing, aka "WINS Service Failed Response Vulnerability."
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Analysis
by VulDB Data Team • 01/15/2025
The WINS service in Microsoft Windows Server 2003 and Windows Server 2008 systems contains a critical vulnerability that stems from improper handling of socket send exceptions within the Windows Internet Name Service implementation. This flaw exists in the way the service processes network packets, specifically when managing socket operations and memory allocation during response generation. The vulnerability manifests when the WINS service receives crafted malicious packets that trigger unexpected behavior in the socket communication layer, leading to memory corruption issues that can be exploited by remote attackers to execute arbitrary code or cause system crashes.
The technical root cause of this vulnerability lies in how the WINS service manages stack frames and buffer handling during network response generation. When the service encounters socket send exceptions, it fails to properly validate or sanitize the memory structures used for packet processing, resulting in unintended stack-frame values that can be manipulated by attackers. This memory corruption occurs during the buffer passing mechanism where the service attempts to send responses back to clients, creating opportunities for attackers to inject malicious code or corrupt critical memory regions. The vulnerability is classified under CWE-121, which deals with stack-based buffer overflow conditions, and represents a classic example of improper exception handling in network services.
The operational impact of this vulnerability extends beyond simple denial of service scenarios to include complete system compromise. Remote attackers can leverage this weakness to execute arbitrary code with system-level privileges, effectively taking control of affected Windows Server systems. The memory corruption can lead to unpredictable behavior including system crashes, application failures, and potential privilege escalation attacks. In enterprise environments where Windows Server 2003 and 2008 systems are still operational, this vulnerability represents a significant risk as these platforms may not receive security updates due to end-of-life status, leaving organizations exposed to persistent threats. The vulnerability aligns with ATT&CK technique T1059, which covers command and scripting interpreter, as attackers can use the executed code to establish persistent access or escalate privileges within the compromised systems.
Mitigation strategies for this vulnerability require immediate action from system administrators, including implementing network segmentation to restrict access to WINS services, disabling the WINS service entirely if not required, and applying available security patches from Microsoft. Organizations should also deploy network monitoring solutions to detect and alert on suspicious packet patterns that may indicate exploitation attempts. The vulnerability demonstrates the importance of proper exception handling in network services and serves as a reminder that legacy systems often contain unpatched vulnerabilities that can be exploited by determined attackers. Security teams must prioritize the identification and remediation of similar vulnerabilities in other legacy services and ensure that proper input validation and memory management practices are implemented across all network-facing applications to prevent similar issues from occurring in the future.