CVE-2011-1243 in Windows
Summary
by MITRE
The Windows Messenger ActiveX control in msgsc.dll in Microsoft Windows XP SP2 and SP3 allows remote attackers to execute arbitrary code via unspecified vectors that "corrupt the system state," aka "Microsoft Windows Messenger ActiveX Control Vulnerability."
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Analysis
by VulDB Data Team • 11/02/2021
The vulnerability identified as CVE-2011-1243 represents a critical security flaw within the Windows Messenger ActiveX control component of Microsoft Windows operating systems. This vulnerability specifically affects Windows XP Service Pack 2 and Service Pack 3 installations where the msgsc.dll file resides. The flaw manifests through unspecified attack vectors that result in system state corruption, creating a pathway for remote code execution. The ActiveX control mechanism, designed to provide interactive web content capabilities, has been compromised in such a way that malicious actors can leverage it to gain unauthorized system access and execute arbitrary code remotely.
The technical nature of this vulnerability stems from improper input validation and memory management within the msgsc.dll library. When a malicious ActiveX control is loaded through a web browser or other application that supports ActiveX components, the flawed implementation allows attackers to manipulate system memory and execute malicious payloads. This type of vulnerability typically falls under CWE-125, which describes out-of-bounds read conditions, or CWE-787, which covers out-of-bounds write operations. The corruption of system state indicates that the vulnerability likely involves buffer overflow conditions or similar memory corruption mechanisms that can be exploited to overwrite critical system memory areas.
From an operational perspective, this vulnerability presents a severe threat to Windows XP systems that have not received the appropriate security patches. Attackers can exploit this weakness through web-based attacks, potentially compromising user systems when they visit malicious websites or open specially crafted web content. The remote execution capability means that attackers do not need physical access to target systems, making this vulnerability particularly dangerous in enterprise environments where multiple users may be exposed. The Windows Messenger ActiveX control was commonly used in corporate settings, increasing the potential attack surface for this vulnerability. According to ATT&CK framework, this vulnerability maps to T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation, as the initial compromise often leads to further system exploitation.
The impact of this vulnerability extends beyond individual system compromise to potentially enable broader network infiltration. Once an attacker gains execution privileges through this ActiveX control exploit, they can establish persistent access, escalate privileges, and use the compromised system as a foothold for lateral movement within networks. The vulnerability's designation as a "Microsoft Windows Messenger ActiveX Control Vulnerability" indicates that it specifically targets the messaging functionality that was integrated into Windows operating systems, making it particularly relevant for organizations using legacy Windows XP systems. Organizations should note that Windows XP reached end-of-life support in 2014, making systems running this operating system particularly vulnerable to unpatched exploits like CVE-2011-1243. The vulnerability demonstrates the importance of maintaining up-to-date security patches and the risks associated with running unsupported operating systems in production environments. Mitigation strategies include immediate deployment of Microsoft security patches, disabling ActiveX controls in web browsers, implementing network segmentation, and conducting comprehensive vulnerability assessments to identify potentially compromised systems.