CVE-2011-3503 in eSignal
Summary
by MITRE
Untrusted search path vulnerability in eSignal 10.6.2425.1208, and possibly other versions, allows local users, and possibly remote attackers, to execute arbitrary code and conduct DLL hijacking attacks via a Trojan horse JRS_UT.dll that is located in the same folder as a .quo (QUOTE) file. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 11/20/2021
The vulnerability identified as CVE-2011-3503 represents a critical untrusted search path weakness affecting eSignal version 10.6.2425.1208 and potentially other iterations of the software. This flaw resides in the application's dynamic link library loading mechanism, where the software fails to properly validate the source and integrity of dynamically loaded libraries. The vulnerability specifically manifests when the eSignal application processes .quo (QUOTE) files, which are used for storing trading data and quotes within the platform. When such a file is opened, the application searches for required libraries in the same directory as the .quo file, creating an exploitable condition where malicious actors can place specially crafted DLL files in the same folder.
The technical exploitation of this vulnerability leverages the principle of DLL hijacking, where an attacker places a maliciously crafted DLL file named JRS_UT.dll in the same directory as a targeted .quo file. This attack vector is particularly dangerous because it requires no special privileges for local execution and can potentially be extended to remote exploitation scenarios. The vulnerability falls under CWE-427 Uncontrolled Search Path Element, which specifically addresses the issue of applications searching for libraries in predictable locations without proper validation. The flaw demonstrates poor input sanitization and library loading practices that violate fundamental security principles of least privilege and secure coding standards.
The operational impact of this vulnerability extends beyond simple code execution, as it enables attackers to conduct sophisticated malicious activities within the context of the eSignal application. Local users can leverage this weakness to escalate privileges or gain unauthorized access to trading data, potentially compromising sensitive financial information. Remote exploitation capabilities, while not definitively confirmed, suggest that attackers could deliver malicious .quo files through various attack vectors including email attachments, web downloads, or compromised websites. This vulnerability directly maps to ATT&CK technique T1059.001 Command and Scripting Interpreter, as it allows adversaries to execute arbitrary code through legitimate system interfaces.
Security professionals should recognize this vulnerability as a prime example of how legacy applications often contain unpatched search path flaws that persist across multiple versions. The attack scenario typically involves placing a malicious DLL in the same directory as a legitimate .quo file, which then gets loaded by eSignal when the user opens the file. Mitigation strategies should include immediate application updates from the vendor, implementation of proper file access controls, and network segmentation to prevent unauthorized file placement. Organizations should also consider deploying application whitelisting solutions and monitoring for suspicious DLL loading patterns. The vulnerability highlights the critical importance of secure coding practices and regular security assessments of third-party applications, particularly those handling sensitive financial data. Additionally, system administrators should implement file integrity monitoring solutions to detect unauthorized DLL placements in directories where .quo files are processed.