CVE-2011-0660 in Windows
Summary
by MITRE
The SMB client in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote SMB servers to execute arbitrary code via a crafted (1) SMBv1 or (2) SMBv2 response, aka "SMB Client Response Parsing Vulnerability."
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 11/02/2021
The SMB Client Response Parsing Vulnerability identified as CVE-2011-0660 represents a critical security flaw affecting multiple versions of Microsoft Windows operating systems including Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, as well as Windows 7 Gold and SP1. This vulnerability specifically targets the Server Message Block protocol implementation within the Windows SMB client component, creating a pathway for remote code execution when the system processes responses from malicious SMB servers. The flaw manifests when the vulnerable SMB client receives crafted responses over both SMBv1 and SMBv2 protocols, making it particularly dangerous as it affects multiple versions of the SMB protocol that were widely deployed across enterprise environments.
The technical nature of this vulnerability stems from inadequate input validation within the SMB client response parsing mechanism. When a Windows system connects to an SMB server and receives a malformed response containing specially crafted data structures, the client fails to properly validate the incoming data before processing it. This parsing error creates a buffer overflow condition or other memory corruption scenarios that adversaries can exploit to inject and execute arbitrary code within the context of the target system. The vulnerability operates at the protocol level, meaning that an attacker does not need to authenticate to the target system to exploit this flaw, making it particularly concerning for network-based attacks. According to CWE standards, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read vulnerabilities that can lead to arbitrary code execution.
The operational impact of CVE-2011-0660 extends beyond individual system compromise, potentially enabling attackers to establish persistent access within network environments where Windows systems are prevalent. Attackers can leverage this vulnerability to execute malicious code with the privileges of the targeted system, often resulting in full system compromise and potential lateral movement throughout the network. The vulnerability's ability to affect multiple Windows versions simultaneously creates widespread risk for organizations with mixed operating system deployments, as attackers can target the most vulnerable systems regardless of their specific Windows version. This vulnerability has been extensively documented in various attack frameworks and has been incorporated into numerous exploit kits, making it a favored target for both automated attacks and targeted intrusions. Organizations have historically struggled with this vulnerability due to its widespread deployment across legacy systems and the difficulty of patching systems that may be critical to business operations.
Mitigation strategies for CVE-2011-0660 should encompass multiple layers of defense to address both immediate protection and long-term security posture improvement. The primary recommendation involves applying Microsoft security updates and patches that address the specific SMB parsing vulnerabilities, though organizations should be aware that some legacy systems may not be fully supported by current patches. Network-level mitigations include disabling SMBv1 protocol support on systems where it is not strictly required, as this protocol is particularly vulnerable to various attack vectors including this one. Implementing network segmentation and access controls can limit the potential impact of successful exploitation attempts. Security monitoring should focus on detecting anomalous SMB traffic patterns and unusual authentication behaviors that might indicate exploitation attempts. According to ATT&CK framework, this vulnerability aligns with techniques such as T1075 and T1210, which involve remote access and exploitation of vulnerabilities in network services. Organizations should also consider implementing endpoint protection solutions that can detect and prevent exploitation attempts through behavioral analysis and signature-based detection methods. The vulnerability underscores the importance of maintaining current security patches and regularly assessing network configurations to minimize exposure to known vulnerabilities.