CVE-2017-10820 in IP Messenger
Summary
by MITRE
Untrusted search path vulnerability in Installer of IP Messenger for Win 4.60 and earlier allows an attacker to gain privileges via a Trojan horse DLL in an unspecified directory.
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Analysis
by VulDB Data Team • 11/03/2019
The vulnerability identified as CVE-2017-10820 represents a critical untrusted search path issue within the Installer component of IP Messenger for Windows version 4.60 and earlier. This flaw resides in the installer's handling of dynamic link library (dll) loading mechanisms, where the application fails to properly validate or restrict the directories from which it loads required libraries. The vulnerability manifests when the installer processes a malicious dll file that has been placed in an unspecified directory, potentially allowing an attacker to execute arbitrary code with elevated privileges. This type of vulnerability falls under the category of CWE-426 Untrusted Search Path, which specifically addresses situations where applications search for libraries in directories that can be manipulated by untrusted users or processes. The installer's behavior creates a dangerous condition where legitimate system directories are bypassed, opening pathways for privilege escalation attacks. According to the ATT&CK framework, this vulnerability maps to T1068 Privilege Escalation through the use of legitimate system tools and processes, where the attacker leverages the installer's trust in unspecified directories to gain elevated access.
The technical implementation of this vulnerability stems from improper handling of the Windows dynamic link library search order. When the IP Messenger installer attempts to load required dll components, it follows a search path that includes current working directory and other user-controllable locations before checking system directories. This ordering allows an attacker to place a malicious dll with the same name as a legitimate library in a directory that gets searched first. The installer, lacking proper validation mechanisms, loads the attacker-controlled dll instead of the intended system library, thereby executing malicious code within the context of the installer process. The privilege escalation aspect occurs because installers typically run with elevated permissions, making any code execution within their context equally privileged. The vulnerability's impact is amplified by the fact that the affected version of IP Messenger for Windows was widely deployed, increasing the potential attack surface and making it an attractive target for exploitation.
The operational impact of CVE-2017-10820 extends beyond simple code execution to encompass significant security implications for systems running vulnerable versions of IP Messenger. Attackers can leverage this vulnerability to perform various malicious activities including credential theft, system reconnaissance, or establishing persistent backdoors within the compromised environment. The attack vector requires minimal sophistication as it relies on placing a malicious dll file in an accessible location, making it particularly dangerous in environments where users may not be security-aware. Organizations using IP Messenger for Windows 4.60 or earlier face potential compromise of their entire system if an attacker successfully exploits this vulnerability. The vulnerability also poses risks to network security infrastructure, as attackers could use the elevated privileges to manipulate system configurations or access sensitive data within the network. The lack of proper input validation and directory restriction mechanisms in the installer creates a fundamental security flaw that undermines the integrity of the installation process itself.
Mitigation strategies for CVE-2017-10820 should focus on immediate remediation through software updates and implementation of system-wide security controls. The most effective approach involves upgrading to a patched version of IP Messenger for Windows that addresses the untrusted search path vulnerability. System administrators should also implement strict access controls on system directories and monitor for unauthorized dll file placements. The principle of least privilege should be enforced by ensuring that installers run with minimal required permissions rather than elevated privileges. Additionally, implementing application whitelisting solutions can prevent execution of unauthorized dll files, while regular security audits should monitor for potential exploitation attempts. Organizations should also consider deploying endpoint protection solutions that can detect and prevent suspicious dll loading behaviors. The vulnerability highlights the importance of secure coding practices and proper validation of library loading mechanisms, aligning with security standards such as those outlined in the OWASP Secure Coding Practices and NIST SP 800-53 security controls for software development lifecycle security.