CVE-2012-2424 in QuickBooks
Summary
by MITRE
The intu-help-qb (aka Intuit Help System Async Pluggable Protocol) handlers in HelpAsyncPluggableProtocol.dll in Intuit QuickBooks 2009 through 2012, when Internet Explorer is used, allow remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a URI that lacks a required delimiter.
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Analysis
by VulDB Data Team • 12/23/2024
The vulnerability described in CVE-2012-2424 represents a critical denial of service flaw within the Intuit QuickBooks software suite, specifically affecting versions from 2009 through 2012. This issue resides within the HelpAsyncPluggableProtocol.dll component, which serves as the asynchronous pluggable protocol handler for the Intuit Help System. The vulnerability manifests when Internet Explorer is used as the web browser, creating a dangerous intersection between the software's help system and web browser functionality. The flaw stems from inadequate input validation within the protocol handler, specifically failing to properly handle URIs that lack required delimiters. This weakness creates a scenario where a malicious actor can craft specially formatted URLs that, when processed by the vulnerable QuickBooks application, trigger unexpected behavior in the underlying help system component.
The technical exploitation of this vulnerability occurs through a NULL pointer dereference condition that fundamentally breaks the application's execution flow. When a URI without the required delimiter is processed by the HelpAsyncPluggableProtocol.dll component, the handler attempts to access memory locations that have not been properly initialized or allocated. This NULL pointer dereference represents a classic software bug pattern that falls under CWE-476, which specifically addresses NULL pointer dereference vulnerabilities. The application crash that results from this condition is not merely a minor inconvenience but represents a complete system failure that prevents users from accessing the help system functionality, effectively rendering part of the application unusable. The vulnerability's impact is amplified by the fact that it can be triggered through web-based interactions, making it particularly dangerous in environments where users might encounter malicious links or be tricked into clicking on compromised content.
The operational impact of this vulnerability extends beyond simple application instability, affecting business continuity and user productivity within organizations that rely heavily on QuickBooks for financial management. When the application crashes due to this vulnerability, users lose access to critical help documentation and support features that are essential for navigating the software's complex interface. This denial of service condition can occur at any time during normal usage, making it particularly disruptive in professional environments where financial data management is time-sensitive. The vulnerability's remote nature means that attackers can potentially exploit it without physical access to the target system, making it a significant concern for enterprise security teams. From an attack perspective, this vulnerability aligns with ATT&CK technique T1499.004, which covers "Utilities: Data Destruction" and represents a form of service disruption that can be leveraged as part of broader attack campaigns.
The exploitation of this vulnerability demonstrates the importance of proper input validation and error handling within software applications, particularly those that interface with web-based protocols. The flaw indicates a lack of defensive programming practices that should be implemented to prevent null pointer dereference conditions. Security practitioners should note that this vulnerability represents a common pattern in software development where protocol handlers fail to properly validate input parameters, creating potential crash conditions. Organizations using affected QuickBooks versions should implement immediate mitigations including updating to patched versions, implementing network-level controls to prevent access to potentially malicious URIs, and educating users about the risks of clicking on untrusted links. The vulnerability also highlights the need for comprehensive security testing of protocol handlers and pluggable components within enterprise software, as these elements often receive less scrutiny than core application functionality. Additionally, the issue underscores the importance of maintaining current software versions and implementing proper patch management procedures to protect against known vulnerabilities that can be exploited remotely.