CVE-2007-2919 in FlipViewer
Summary
by MITRE
Multiple stack-based buffer overflows in the FViewerLoading ActiveX control (FlipViewerX.dll) in E-Book Systems FlipViewer before 4.1 allow remote attackers to cause a denial of service (crash) or execute arbitrary code via long (1) UID, (2) Opf, (3) PAGENO, (4) LaunchMode, (5) SubID, (6) BookID, (7) LibraryID, (8) SubURL, and (9) LoadOpf properties.
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Analysis
by VulDB Data Team • 06/08/2025
The CVE-2007-2919 vulnerability represents a critical stack-based buffer overflow flaw in the FViewerLoading ActiveX control component of E-Book Systems FlipViewer software version 4.0 and earlier. This vulnerability exists within the FlipViewerX.dll library and affects the software's ability to properly validate input parameters when processing various properties related to e-book document loading and navigation. The vulnerability specifically targets nine distinct properties including UID, Opf, PAGENO, LaunchMode, SubID, BookID, LibraryID, SubURL, and LoadOpf, all of which can be exploited through malformed input data to trigger memory corruption. The flaw stems from inadequate bounds checking and input validation mechanisms within the ActiveX control's implementation, creating a pathway for attackers to manipulate the program's execution flow through stack memory corruption.
The technical exploitation of this vulnerability occurs through the manipulation of the nine vulnerable properties mentioned in the CVE description. When these properties receive input data exceeding the allocated buffer space, the excess data overflows into adjacent memory locations, potentially overwriting critical program structures, return addresses, or other executable code. This type of stack-based buffer overflow aligns with CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite stack memory. The vulnerability's classification as a remote code execution vector indicates that attackers can trigger the overflow through network-based input without requiring local system access, making it particularly dangerous for web-based applications or services that utilize the FlipViewer ActiveX control.
The operational impact of CVE-2007-2919 extends beyond simple denial of service conditions to encompass full arbitrary code execution capabilities, which can result in complete system compromise. When successfully exploited, the buffer overflow can cause the FlipViewer application to crash or, more dangerously, allow remote attackers to execute malicious code with the privileges of the affected user. This vulnerability affects systems where the E-Book Systems FlipViewer software is installed and actively used, particularly in environments where ActiveX controls are enabled and trusted. The attack surface is broadened when the vulnerable component is integrated into web browsers or other applications that load e-book content through the FlipViewer interface. From an adversarial perspective, this vulnerability maps to ATT&CK technique T1059.007 for command and control through ActiveX, and T1203 for exploitation of vulnerabilities in software components.
Mitigation strategies for CVE-2007-2919 must address both the immediate vulnerability and broader security posture of affected systems. The primary remediation involves upgrading to E-Book Systems FlipViewer version 4.1 or later, which contains patches specifically designed to address the buffer overflow conditions in the FViewerLoading ActiveX control. System administrators should also implement strict input validation policies and consider disabling ActiveX controls in web browsers where possible, as this reduces the attack surface for such vulnerabilities. Network segmentation and application whitelisting can help prevent unauthorized execution of vulnerable components, while regular security assessments should verify that all installed software components are current with security patches. The vulnerability highlights the importance of proper software security practices including input validation, bounds checking, and regular vulnerability assessments, particularly for legacy ActiveX controls that may not receive ongoing security updates from vendors.