CVE-2008-0492 in XUpload
Summary
by MITRE
Stack-based buffer overflow in the Persits.XUpload.2 ActiveX control in XUpload.ocx 3.0.0.4 and earlier in Persits XUpload 3.0 allows remote attackers to execute arbitrary code via a long argument to the AddFile method. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 10/14/2024
The vulnerability identified as CVE-2008-0492 represents a critical stack-based buffer overflow flaw within the Persits.XUpload.2 ActiveX control, specifically affecting XUpload.ocx version 3.0.0.4 and earlier implementations. This issue resides within the Persits XUpload 3.0 component suite, which is commonly deployed in web applications requiring file upload functionality. The vulnerability manifests through the AddFile method of the ActiveX control, where improper input validation allows attackers to manipulate memory structures through crafted arguments. Such buffer overflow conditions occur when programs write more data to a fixed-length memory buffer than it can accommodate, leading to overwriting adjacent memory locations. The flaw specifically impacts systems where the vulnerable ActiveX control is registered and accessible, typically in Internet Explorer environments where ActiveX controls are enabled and trusted by users. This vulnerability classifies under CWE-121, which describes stack-based buffer overflow conditions, and aligns with ATT&CK technique T1555.003 for credentials from password stores, as exploitation may lead to privilege escalation through code execution. The security implications extend beyond simple code execution, as attackers can leverage this vulnerability to gain unauthorized access to systems, potentially leading to complete system compromise.
The technical exploitation of this vulnerability requires an attacker to craft a malicious argument that exceeds the allocated buffer size within the AddFile method implementation. When the vulnerable ActiveX control processes this oversized argument, the stack memory layout becomes corrupted, allowing attackers to overwrite return addresses and function pointers with malicious code locations. This memory corruption typically occurs due to insufficient bounds checking in the method parameter handling, where string length validation is either absent or inadequate. The attack vector is particularly dangerous because it can be triggered through web-based interfaces that utilize the vulnerable ActiveX control, making it a remote exploit opportunity. Attackers can construct malicious web pages that automatically invoke the AddFile method with oversized parameters, potentially leading to arbitrary code execution in the context of the user running the vulnerable application. The vulnerability's impact is amplified by the widespread use of Persits XUpload components in enterprise web applications, making numerous systems susceptible to exploitation.
The operational impact of CVE-2008-0492 extends significantly beyond immediate code execution capabilities, as it represents a foundational security weakness that can be leveraged for persistent system compromise. Organizations deploying vulnerable XUpload components face potential data breaches, system infiltration, and unauthorized access to sensitive information. The exploitability of this vulnerability is particularly concerning in environments where users have administrative privileges or where the vulnerable component is accessible from untrusted networks. Security professionals must consider the broader implications of this vulnerability within their network architecture, as it can serve as an initial access point for more sophisticated attacks. The vulnerability also highlights the risks associated with legacy ActiveX controls in modern security environments, where such components often lack proper memory safety mechanisms and are difficult to patch or update. Organizations should conduct comprehensive vulnerability assessments to identify all instances of the vulnerable XUpload.ocx component and implement immediate remediation strategies to prevent exploitation attempts.
Mitigation strategies for CVE-2008-0492 should prioritize immediate remediation through component updates, as Persits has released patched versions of the XUpload component that address the buffer overflow vulnerability. System administrators should disable or remove the vulnerable ActiveX control from all affected systems, particularly in environments where it is not strictly required for legitimate business operations. Network segmentation and access controls should be implemented to restrict access to systems hosting vulnerable components, while browser security settings should be configured to prevent automatic execution of ActiveX controls. Regular security assessments and penetration testing should include verification of ActiveX control installations to prevent re-introduction of vulnerable components. Organizations should also consider implementing application whitelisting policies that restrict execution of unsigned or untrusted ActiveX controls. The vulnerability serves as a critical reminder of the importance of maintaining up-to-date security patches and the inherent risks associated with legacy ActiveX technologies in contemporary security environments. Additionally, security monitoring should be enhanced to detect attempts to access vulnerable components through network traffic analysis and system log monitoring.