CVE-2007-2763 in Digital Music Mentor
Summary
by MITRE
Buffer overflow in the UnlockSupport function in the LockModules subsystem in a certain ActiveX control in ltmm15.dll in Sienzo Digital Music Mentor (DMM) 2.6.0.4 allows remote attackers to execute arbitrary code via a long string in the second argument, a different issue than CVE-2007-2564.
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Analysis
by VulDB Data Team • 10/17/2017
The vulnerability identified as CVE-2007-2763 represents a critical buffer overflow condition within the LockModules subsystem of Sienzo Digital Music Mentor version 2.6.0.4. This flaw exists in the ltmm15.dll ActiveX control component and specifically affects the UnlockSupport function which processes user input through its second argument parameter. The vulnerability falls under the Common Weakness Enumeration category CWE-121, which describes stack-based buffer overflow conditions that occur when insufficient bounds checking allows attackers to overwrite adjacent memory locations. The ActiveX control architecture in this context creates a particularly dangerous attack surface as it enables remote code execution through web-based interfaces where the vulnerable component can be loaded and invoked.
The technical implementation of this vulnerability demonstrates a classic buffer overflow exploitation pattern where a maliciously crafted string input exceeding the allocated buffer size in the UnlockSupport function triggers memory corruption. When the second argument exceeds the predetermined buffer limits, the overflow propagates into adjacent memory regions, potentially overwriting critical control data such as return addresses or function pointers. This memory corruption directly enables attackers to manipulate the program execution flow and execute arbitrary code with the privileges of the compromised process. The vulnerability is distinct from CVE-2007-2564, indicating that while both issues affect the same software component, they manifest through different code paths and attack vectors, suggesting multiple weaknesses in the input validation mechanisms of the LockModules subsystem.
Operationally, this vulnerability presents a severe threat to systems running the affected Sienzo Digital Music Mentor software, particularly in enterprise environments where ActiveX controls are permitted to execute. Attackers can leverage this weakness through web-based delivery mechanisms, potentially compromising user systems when they visit malicious websites or open compromised email attachments containing the vulnerable ActiveX control. The attack requires minimal user interaction beyond visiting a malicious site, making it particularly dangerous in social engineering campaigns. The remote code execution capability allows attackers to establish persistent access, deploy additional malware, or escalate privileges to system-level access, depending on the execution context and user permissions. According to ATT&CK framework techniques, this vulnerability maps to T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation, with the initial compromise occurring through T1190 for Exploit Public-Facing Application.
Mitigation strategies for CVE-2007-2763 should prioritize immediate software updates and patches from the vendor, as the vulnerability has been addressed in subsequent versions of the Sienzo Digital Music Mentor software. System administrators should implement strict ActiveX control restrictions through group policy settings or browser security configurations to prevent automatic loading of potentially vulnerable components. Network-based defenses including web application firewalls and intrusion prevention systems can be configured to detect and block malicious input patterns targeting this specific vulnerability. Additionally, users should be educated about the risks of visiting untrusted websites and opening suspicious email attachments, as social engineering remains a primary delivery mechanism for such exploits. The vulnerability highlights the importance of proper input validation and bounds checking in software development, with developers implementing defensive programming practices such as using safe string manipulation functions and employing stack canaries to detect buffer overflow conditions before they can be exploited. Organizations should also conduct regular vulnerability assessments and penetration testing to identify similar issues in other legacy software components that may be running with elevated privileges or exposed to untrusted input sources.