CVE-2011-1868 in Windows
Summary
by MITRE
The Distributed File System (DFS) implementation in Microsoft Windows XP SP2 and SP3 and Server 2003 SP2 does not properly validate fields in DFS responses, which allows remote DFS servers to execute arbitrary code via a crafted response, aka "DFS Memory Corruption Vulnerability."
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Analysis
by VulDB Data Team • 03/19/2021
The CVE-2011-1868 vulnerability represents a critical memory corruption flaw within Microsoft's Distributed File System implementation that affects Windows XP SP2 and SP3 as well as Windows Server 2003 SP2 operating systems. This vulnerability resides in the way these systems process DFS responses from remote servers, creating an exploitable condition that can lead to arbitrary code execution. The flaw specifically manifests when the affected systems receive crafted DFS responses that contain malformed data fields, which the implementation fails to properly validate before processing. This improper validation creates a pathway for malicious actors to inject and execute arbitrary code on vulnerable systems, potentially compromising the entire network infrastructure that relies on DFS for file sharing operations.
The technical nature of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write operations. The vulnerability operates through a classic buffer overflow mechanism where insufficient input validation allows attackers to manipulate memory structures within the DFS client implementation. When a vulnerable system processes a malicious DFS response, the malformed fields trigger memory corruption that can be exploited to redirect execution flow and ultimately execute malicious payloads. The attack vector requires network access to a remote DFS server that can be controlled by an attacker, making this vulnerability particularly dangerous in enterprise environments where DFS is commonly deployed for file sharing and resource access.
From an operational impact perspective, this vulnerability poses significant risks to organizations relying on Windows XP or Server 2003 systems with DFS functionality. The ability to execute arbitrary code remotely means that attackers can gain complete system compromise, potentially leading to data theft, lateral movement within networks, and establishment of persistent backdoors. The vulnerability affects core file sharing operations, making it particularly damaging for businesses that depend on DFS for cross-domain file access and resource management. Given that these operating systems are no longer supported by Microsoft, organizations with legacy systems remain highly vulnerable to exploitation, as no security patches are available for these platforms.
Mitigation strategies for CVE-2011-1868 should focus on immediate network segmentation and access control measures to limit exposure to remote DFS servers. Organizations should implement network monitoring to detect anomalous DFS traffic patterns and consider disabling DFS functionality where possible. The ATT&CK framework categorizes this vulnerability under T1210 - Exploitation of Remote Services, highlighting the importance of securing remote access points and implementing proper network boundary controls. Additionally, organizations should consider deploying network intrusion detection systems that can identify and block malicious DFS responses, while also planning for migration away from unsupported operating systems to more secure platforms. The vulnerability demonstrates the critical importance of maintaining current security patches and the dangers of operating legacy systems without proper security controls.