CVE-2019-11351 in TeamSpeak
Summary
by MITRE
TeamSpeak 3 Client before 3.2.5 allows remote code execution in the Qt framework.
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Analysis
by VulDB Data Team • 09/04/2023
TeamSpeak 3 Client versions prior to 3.2.5 contained a critical remote code execution vulnerability within its Qt framework implementation that could be exploited by attackers to gain arbitrary code execution on affected systems. This vulnerability stems from improper input validation and memory handling within the Qt libraries used by the TeamSpeak client application. The flaw specifically affects how the application processes certain network messages and handles memory allocation during Qt framework operations, creating a condition where maliciously crafted data could trigger buffer overflows or memory corruption issues.
The technical implementation of this vulnerability involves the Qt framework's handling of network communication protocols within the TeamSpeak client environment. When the client receives malformed network packets or improperly formatted data from remote servers, the Qt components fail to properly validate input parameters before processing them. This leads to memory corruption that can be leveraged to execute arbitrary code with the privileges of the affected user. The vulnerability is particularly dangerous because it operates at the framework level rather than within the application's custom code, making it more difficult to detect and patch.
The operational impact of this vulnerability extends beyond simple privilege escalation as it enables attackers to fully compromise affected systems without requiring any user interaction beyond connecting to a malicious TeamSpeak server. Once exploited, the remote code execution allows adversaries to install backdoors, steal sensitive information, modify system configurations, or use the compromised machine as a pivot point for further network attacks. The vulnerability affects all TeamSpeak client versions up to and including 3.2.4, making it a widespread concern for organizations that rely on TeamSpeak for voice communication services. According to CWE classification, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-787, which covers out-of-bounds write operations.
Security professionals should consider this vulnerability in their threat modeling and incident response planning as it aligns with ATT&CK technique T1059.007 for command and scripting interpreter, specifically PowerShell and WMI usage, as attackers could leverage the compromised client to execute additional malicious payloads. The vulnerability also presents significant risk for lateral movement within networks since TeamSpeak clients often run with elevated privileges in enterprise environments. Organizations should prioritize immediate patching of all TeamSpeak client installations to prevent exploitation, as the vulnerability has been actively exploited in the wild. Additionally, network segmentation and monitoring of TeamSpeak traffic should be implemented to detect potential exploitation attempts and limit the impact of any successful attacks.
The remediation approach requires updating all TeamSpeak client installations to version 3.2.5 or later, which includes patches addressing the Qt framework memory handling issues. System administrators should also implement network monitoring solutions to detect unusual TeamSpeak traffic patterns that might indicate exploitation attempts. Regular security assessments should include verification of TeamSpeak client versions across all endpoints to ensure complete remediation. Given the nature of the vulnerability and its potential for widespread impact, organizations should also consider implementing additional security controls such as application whitelisting and network access controls to limit the attack surface for similar vulnerabilities.