CVE-2018-17560 in Desktop Client
Summary
by MITRE
The admin interface of the Grouptime Teamwire Client 1.5.1 prior to 1.9.0 on-premises messenger server allows stored XSS. All backend versions prior to prod-2018-11-13-15-00-42 are affected.
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Analysis
by VulDB Data Team • 10/09/2023
The vulnerability identified as CVE-2018-17560 represents a critical stored cross-site scripting flaw within the administrative interface of the Grouptime Teamwire Client version 1.5.1 and earlier releases. This security weakness specifically impacts on-premises messenger server deployments and affects all backend versions prior to the prod-2018-11-13-15-00-42 release. The flaw exists in the administrative console where user-supplied input is not properly sanitized before being stored and subsequently rendered back to users, creating an environment where malicious script execution can occur. This vulnerability is particularly concerning as it targets the administrative interface, which typically contains sensitive configuration data and user management capabilities that could be exploited by attackers to gain unauthorized access or manipulate system operations.
The technical implementation of this stored XSS vulnerability stems from insufficient input validation and output encoding mechanisms within the Teamwire administrative web interface. When administrators or authenticated users submit data through the interface, the application fails to adequately sanitize or escape potentially malicious input before storing it in the backend database. This stored data is then retrieved and displayed without proper context-aware encoding, allowing malicious scripts to execute within the browser context of any user who views the affected content. The vulnerability falls under CWE-79 which specifically addresses Cross-site Scripting flaws, and more specifically represents a stored XSS variant where the malicious payload is permanently stored on the server. This classification aligns with the ATT&CK framework's technique T1059.007 for Command and Scripting Interpreter: JavaScript, as attackers can leverage this vulnerability to execute arbitrary JavaScript code in the context of the victim's browser session.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it provides attackers with the capability to escalate privileges within the administrative interface. An attacker who successfully exploits this vulnerability could potentially manipulate user accounts, modify system configurations, access sensitive data, or even execute arbitrary commands on the server if the administrative interface provides such functionality. The stored nature of the vulnerability means that once exploited, the malicious payload persists and affects all subsequent users who view the compromised content, making it particularly dangerous in environments with multiple administrators or users who regularly access the administrative interface. This vulnerability directly threatens the integrity and confidentiality of the communication platform, as it allows unauthorized parties to gain access to privileged administrative functions that should only be available to authorized personnel.
Mitigation strategies for CVE-2018-17560 should focus on immediate remediation through the application of the vendor-provided security patches released in version 1.9.0 and subsequent builds. Organizations should implement comprehensive input validation and output encoding mechanisms throughout the application's administrative interface, ensuring that all user-supplied data is properly sanitized before storage and appropriately escaped before rendering. The implementation of Content Security Policy headers should be considered as an additional defense-in-depth measure to prevent the execution of unauthorized scripts. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other components of the communication infrastructure. Additionally, network segmentation and privileged access controls should be enforced to limit the potential impact of successful exploitation, ensuring that even if an attacker gains access to the administrative interface, they cannot easily escalate privileges or access other systems within the organization's infrastructure. The vulnerability demonstrates the critical importance of proper input validation and output encoding practices in web applications, particularly within administrative interfaces where the potential for damage is significantly higher than in standard user-facing components.