CVE-2006-5745 in Windows
Summary
by MITRE
Unspecified vulnerability in the setRequestHeader method in the XMLHTTP (XML HTTP) ActiveX Control 4.0 in Microsoft XML Core Services 4.0 on Windows, when accessed by Internet Explorer, allows remote attackers to execute arbitrary code via crafted arguments that lead to memory corruption, a different vulnerability than CVE-2006-4685. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 04/26/2026
The vulnerability identified as CVE-2006-5745 represents a critical memory corruption flaw within the XMLHTTP ActiveX Control 4.0 component of Microsoft XML Core Services 4.0. This vulnerability specifically affects systems running Windows operating systems where Internet Explorer is used as the primary web browser. The issue manifests through the setRequestHeader method, which serves as a critical interface for establishing HTTP request headers in XMLHTTP communication. The flaw allows remote attackers to manipulate the control's behavior through carefully crafted arguments that ultimately result in memory corruption conditions. This represents a significant security risk as it provides attackers with a potential pathway for arbitrary code execution within the context of the user's browser session. The vulnerability operates at the core of web application security frameworks where XMLHTTP requests are commonly utilized for dynamic content loading and server communication. The memory corruption aspect suggests that attackers can manipulate memory addresses and execution flow through improper argument handling within the ActiveX control's method implementation. This type of vulnerability falls under the category of buffer overflow or memory corruption attacks that have been historically exploited for privilege escalation and system compromise. The distinction from CVE-2006-4685 indicates that while both vulnerabilities involve the same XMLHTTP ActiveX control, they exploit different code paths and implementation weaknesses. The ActiveX control's setRequestHeader method appears to lack proper input validation and memory management safeguards when processing maliciously crafted parameters. This vulnerability represents a classic example of unsafe memory handling in legacy Windows components where input parameters are not adequately sanitized or checked for bounds violations. The attack vector requires remote exploitation through Internet Explorer, making it particularly dangerous in environments where users browse untrusted websites or encounter malicious web content. The security implications extend beyond simple code execution as memory corruption vulnerabilities can lead to complete system compromise when combined with other exploitation techniques. According to CWE classification, this vulnerability aligns with CWE-121, which deals with stack-based buffer overflow conditions, and potentially CWE-122 for heap-based buffer overflows. The ATT&CK framework would categorize this under T1059.007 for command and scripting interpreter usage and T1203 for exploitation for privilege escalation. The impact of this vulnerability is particularly severe in enterprise environments where users may encounter malicious web content through email attachments, web browsing, or compromised websites. The XMLHTTP ActiveX control's widespread use in legacy web applications and browser-based scripting makes this vulnerability particularly dangerous as it affects numerous applications that depend on XML communication protocols.
The technical implementation of this vulnerability stems from improper argument handling within the XMLHTTP ActiveX control's setRequestHeader method. When malicious parameters are passed to this method, the control fails to properly validate or sanitize the input before processing, leading to memory corruption conditions. This memory corruption can manifest as stack overflows, heap corruption, or other memory management failures that allow attackers to overwrite critical memory locations. The vulnerability's exploitation requires the target system to be running Internet Explorer with the affected XML Core Services 4.0 component installed, making it a browser-specific attack vector. The flaw exists in the ActiveX control's internal memory management routines where the setRequestHeader method does not adequately check parameter boundaries or validate input lengths. Attackers can craft specific input sequences that cause the control to allocate insufficient memory or overwrite adjacent memory regions, potentially leading to code execution. The vulnerability's nature suggests that the control uses unsafe string handling or memory allocation functions that do not perform adequate bounds checking. This type of memory corruption vulnerability has been historically exploited in Windows environments where the security model relies heavily on proper memory management within browser components. The exploitation process likely involves creating a malicious web page that loads the vulnerable ActiveX control and passes crafted arguments to the setRequestHeader method, triggering the memory corruption condition. The timing and conditions required for successful exploitation indicate that this vulnerability operates in a specific context where the ActiveX control's memory management is directly manipulated through HTTP header parameter handling.
The operational impact of CVE-2006-5745 extends far beyond individual system compromise as it represents a widespread vulnerability affecting numerous Windows systems running Internet Explorer with XML Core Services 4.0. Organizations that rely on legacy web applications or older browser configurations are particularly vulnerable to this attack vector, as the ActiveX control remains integral to many enterprise web applications. The arbitrary code execution capability provides attackers with complete control over affected systems, potentially enabling data exfiltration, system reconnaissance, or further network infiltration. The vulnerability's remote exploitation nature means that attackers can compromise systems without requiring physical access or user interaction beyond visiting a malicious website. This makes it particularly dangerous for organizations that do not maintain strict network security controls or have outdated patch management processes. The attack can be automated through malicious websites or phishing campaigns, allowing for mass exploitation of vulnerable systems. The memory corruption aspect of this vulnerability means that the exploitation can be unpredictable, potentially causing system crashes or more sophisticated attacks that leverage the memory corruption for privilege escalation. Organizations with limited security resources may find this vulnerability particularly challenging to detect and remediate, as it affects core browser components that are deeply integrated into Windows operating systems. The vulnerability's persistence in older Windows versions and Internet Explorer configurations makes it a continuing threat even after newer security patches have been released. The complexity of this vulnerability means that traditional security measures such as firewalls or intrusion detection systems may not effectively prevent exploitation, requiring more comprehensive security approaches.
Mitigation strategies for CVE-2006-5745 must address both immediate remediation and long-term security improvements. The most effective immediate solution involves applying Microsoft security patches and updates that address the specific memory corruption flaw in the XMLHTTP ActiveX control. Organizations should also consider disabling ActiveX controls in Internet Explorer or implementing strict security zones that limit ActiveX control execution. Browser hardening measures including disabling unnecessary ActiveX controls, implementing strict content security policies, and using security software that can detect and block malicious ActiveX behavior. Network-level protections such as web application firewalls and intrusion prevention systems can help detect and block exploitation attempts targeting this vulnerability. Regular security assessments should be conducted to identify systems running vulnerable versions of XML Core Services and Internet Explorer. Implementing security awareness training for users to recognize potential phishing attempts and malicious websites that may exploit this vulnerability. The implementation of application whitelisting policies can prevent execution of malicious code through ActiveX controls. Organizations should also consider migrating away from legacy systems that rely heavily on ActiveX controls and Internet Explorer, moving toward more modern and secure web technologies. Regular patch management processes must be established to ensure that all systems receive security updates promptly. The vulnerability's nature suggests that security monitoring should include detection of unusual ActiveX control behavior and memory access patterns that may indicate exploitation attempts. System administrators should also implement regular vulnerability scanning to identify and remediate systems running vulnerable versions of the affected components. The complexity of this vulnerability requires a layered security approach that combines multiple defensive measures to effectively protect against exploitation attempts.