CVE-2026-104809 in MiVoice Office 400
Summary
by MITRE • 10/05/2026
DigitalCanion has discovered a vulnerability that allows an attacker to cause the system to load an attacker-controlled .so file instead of the expected legitimate module. The loading mechanism relies on a predictable module name without adequately verifying the file’s origin or integrity. A malicious shared object using the expected name can therefore be loaded by a privileged process. The module code then executes within the context and privileges of that process. This results in arbitrary code execution and full compromise of the Mitel Linux virtual machine.
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Analysis
by VulDB Data Team • 10/05/2026
The vulnerability identified in DigitalCanion systems represents a critical security flaw rooted in insecure dynamic library loading practices, specifically involving shared object files with extensions such as .so on Linux-based environments. The core technical deficiency lies in the application's reliance on predictable module names without implementing adequate verification mechanisms for file origin or integrity. When a privileged process attempts to load a specific module, it does not validate whether the binary has been tampered with or if its location is secure against unauthorized modifications. This lack of validation allows an attacker who gains access to the filesystem, even at a lower privilege level, to place a maliciously crafted shared object file in a directory that is searched during the dynamic linking process. Because the system expects a module with a specific name and does not check cryptographic signatures or hash values, it blindly loads the attacker-controlled binary instead of the legitimate one.
This flaw directly facilitates arbitrary code execution within the context of the privileged process responsible for loading the library. Since shared libraries execute in the same memory space as their host application, any code contained within the malicious .so file inherits the full privileges and permissions of that parent process. In this case, because the vulnerable component runs with elevated rights on a Mitel Linux virtual machine, successful exploitation results in complete system compromise. The attacker can escalate privileges to root or other high-level accounts, install backdoors, exfiltrate sensitive data, pivot to other systems within the network, and disrupt critical services provided by the DigitalCanion infrastructure. This scenario is particularly dangerous because it bypasses traditional perimeter defenses that might otherwise restrict direct access to privileged processes, relying instead on a subtle misconfiguration in how dynamic dependencies are resolved at runtime.
From an industry standards perspective, this vulnerability aligns with CWE-427, which describes Uncontrolled Search Path for Dangerous Library. This classification highlights the failure to ensure that only trusted directories are searched when loading shared libraries, or the absence of integrity checks on loaded modules. Furthermore, in terms of offensive security tactics as defined by MITRE ATT&CK, this exploit maps directly to T1059 Command and Scripting Interpreter through dynamic linking mechanisms, specifically leveraging techniques associated with DLL sideloading or library injection (T1620). The attacker effectively uses the system's own trust mechanism against it, turning a standard operational function into an execution vector for malicious payloads.
Mitigation strategies must focus on hardening the application’s interaction with shared libraries and improving overall filesystem security. First, developers should implement strict path validation to ensure that only explicitly defined, secure directories are searched for dynamic dependencies, avoiding reliance on default or world-writable paths such as /tmp or user home directories unless strictly necessary and secured. Second, integrity verification mechanisms must be introduced; this can include using cryptographic signatures (such as those provided by gpg or openssl) to verify the authenticity of shared libraries before loading them, or calculating file hashes at runtime and comparing them against known good values stored in a secure location. Additionally, operating system-level mitigations should be enforced, including setting appropriate permissions on library directories so that only authorized users can write to them, and utilizing security features like SELinux or AppArmor to restrict which processes can load specific libraries from untrusted locations. Regular auditing of file integrity using tools like AIDE or Tripwire can also help detect unauthorized modifications to critical system files before they are exploited.