CVE-2017-20113 in Server
Summary
by MITRE • 06/29/2022
A vulnerability, which was classified as problematic, was found in TrueConf Server 4.3.7. This affects an unknown part. The manipulation leads to basic cross site scripting (Stored). It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 03/24/2023
This vulnerability in TrueConf Server 4.3.7 represents a critical stored cross site scripting flaw that exposes the application to persistent malicious code execution. The vulnerability falls under the CWE-79 category of Cross Site Scripting, specifically classified as stored XSS where malicious scripts are permanently stored on the server and executed when other users access the affected application. The affected component within TrueConf Server remains unspecified, but the impact extends to all users interacting with the vulnerable system. The vulnerability's classification as remotely exploitable indicates that attackers can initiate the attack without requiring physical access or local privileges, making it particularly dangerous for enterprise environments where the server handles sensitive communication data. This stored XSS vulnerability allows attackers to inject malicious JavaScript code into the server's database or storage mechanisms, which then executes whenever legitimate users view the affected content. The public disclosure of this exploit significantly increases the risk to organizations using this version of TrueConf Server, as malicious actors can now leverage established attack patterns to compromise user sessions and potentially escalate privileges.
The operational impact of this vulnerability extends beyond simple script execution to encompass potential data theft, session hijacking, and unauthorized access to sensitive communication channels. Attackers can exploit this flaw to steal user authentication tokens, access confidential meeting recordings, intercept private communications, and potentially gain unauthorized administrative access to the server. The stored nature of the vulnerability means that even after the initial injection, the malicious code persists and continues to affect users until the vulnerability is patched or the malicious content is removed from the server's database. This persistent threat makes it particularly challenging for security teams to monitor and remediate, as the malicious code can remain active for extended periods without detection. Organizations relying on TrueConf Server for video conferencing and communication services face significant risk to their operational continuity and data security, especially when the system handles sensitive corporate or government communications.
Mitigation strategies for this vulnerability must include immediate patching of the TrueConf Server to version 4.3.8 or later, which should contain the necessary security fixes to prevent stored XSS injection. Network segmentation and web application firewalls should be implemented to monitor and filter malicious requests before they reach the vulnerable application. Input validation and output encoding should be strengthened throughout the application to prevent script injection attempts, with particular attention to user-supplied content that gets stored in the database. Security teams should conduct thorough audits of stored data to identify any previously injected malicious scripts and implement proper content sanitization processes. Regular security assessments and penetration testing should be performed to identify similar vulnerabilities in other components of the communication infrastructure. The ATT&CK framework categorizes this vulnerability under T1059.007 for Scripting and T1566.001 for Phishing, highlighting the need for comprehensive defensive measures including user education and email filtering to prevent initial exploitation attempts. Organizations should also consider implementing automated monitoring solutions to detect unusual patterns in user activity that might indicate successful exploitation of the stored XSS vulnerability.