CVE-2010-5234 in Camtasia Studio
Summary
by MITRE
Multiple untrusted search path vulnerabilities in Camtasia Studio 7.0.1 build 57 allow local users to gain privileges via a Trojan horse (1) MFC90ENU.DLL or (2) MFC90LOC.DLL file in the current working directory, as demonstrated by a directory that contains a .cmmp or .camrec 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 • 01/26/2018
CVE-2010-5234 represents a critical untrusted search path vulnerability affecting Camtasia Studio 7.0.1 build 57, classified under CWE-426 as an Untrusted Search Path or Working Directory Manipulation. This vulnerability stems from the application's improper handling of dynamic link library (DLL) loading mechanisms, where the software searches for required libraries in the current working directory before examining system directories. The flaw specifically manifests when the application encounters .cmmp or .camrec files that trigger the loading of MFC90ENU.DLL or MFC90LOC.DLL libraries, creating a privilege escalation vector for local attackers. The vulnerability aligns with ATT&CK technique T1068 which covers privilege escalation through DLL injection and path manipulation, making it particularly dangerous in environments where users might encounter malicious files in common directories. When a local user places a malicious DLL with the same name as the legitimate MFC90ENU.DLL or MFC90LOC.DLL in the current working directory, the application loads the malicious version instead of the legitimate system library, potentially executing arbitrary code with the privileges of the target user. This behavior violates fundamental security principles of least privilege and proper library resolution, as the application does not implement secure DLL loading practices such as specifying full paths or using Windows' Safe DLL Search Mode. The attack vector is particularly insidious because it requires minimal user interaction beyond opening a maliciously crafted file, making it an attractive target for social engineering campaigns. The vulnerability demonstrates a classic case of insecure library loading that has been addressed in modern applications through proper DLL path resolution and the implementation of secure coding practices. Organizations should consider this vulnerability as part of a broader class of path manipulation issues that can lead to privilege escalation and unauthorized code execution, particularly in environments where users have the ability to create or modify files in directories where applications might execute.
The technical exploitation of this vulnerability requires understanding how Windows resolves DLL dependencies and the specific behavior of the Camtasia Studio application during file processing. When a .cmmp or .camrec file is opened, the application's internal mechanisms attempt to load the MFC90ENU.DLL or MFC90LOC.DLL libraries from the current working directory, which is often the same directory as the file being processed. This creates a window of opportunity for attackers to place malicious DLLs in the directory containing the target file, effectively hijacking the application's execution flow. The vulnerability's classification as an untrusted search path issue indicates that the application does not properly validate or restrict the locations from which it loads dynamic libraries, a practice that has been widely recognized as a security anti-pattern in software development. This flaw is particularly concerning in enterprise environments where users may have access to directories containing application files, as it allows for easy privilege escalation without requiring elevated permissions. The attack scenario typically involves an attacker placing a malicious DLL in a directory where a victim will open a .cmmp or .camrec file, leveraging the application's trust in the current working directory for library resolution. This vulnerability highlights the importance of implementing secure coding practices such as using LoadLibrary with full paths, enabling Safe DLL Search Mode, and following the principle of least privilege in application design. From a defensive standpoint, this vulnerability emphasizes the need for proper application sandboxing and the implementation of security controls that prevent arbitrary code execution through library loading mechanisms. The remediation approach should focus on updating to patched versions of Camtasia Studio, implementing proper DLL loading practices in custom applications, and applying security measures such as application whitelisting to prevent execution of unauthorized DLLs.
The operational impact of CVE-2010-5234 extends beyond simple privilege escalation to encompass potential data compromise and system infiltration. Local attackers with access to a victim's system can leverage this vulnerability to execute malicious code with the privileges of the victim user, potentially leading to unauthorized access to sensitive data, system reconnaissance, or further escalation to administrative privileges. The vulnerability's effectiveness is amplified by its low detection rate, as the malicious DLLs can be placed in seemingly legitimate directories without raising immediate alarms. This characteristic makes it particularly dangerous in persistent threat scenarios where attackers seek to establish long-term access to systems. The vulnerability also demonstrates how legacy applications may contain security flaws that were not present in their original design phases, highlighting the importance of ongoing security assessments and vulnerability management processes. Security teams should consider this vulnerability when implementing security controls for multimedia and recording applications, as similar patterns of untrusted search path exploitation have been observed in other software applications. The vulnerability's persistence in older versions of Camtasia Studio indicates that proper security testing and code review practices were not adequately implemented during the development lifecycle, suggesting a broader issue with security awareness in software development processes. Organizations should also recognize that this vulnerability type remains relevant in modern contexts where applications still rely on legacy code patterns or fail to implement proper DLL loading security measures. The implementation of security controls such as monitoring for suspicious DLL loading behavior, enforcing secure library resolution practices, and conducting regular security assessments can help mitigate the risk posed by similar vulnerabilities in other applications. This vulnerability serves as a reminder of the critical importance of secure coding practices and the need for continuous security education and awareness within development teams to prevent such issues from being introduced into software products.