CVE-2018-0199 in Jabber Client Framework
Summary
by MITRE
A vulnerability in Cisco Jabber Client Framework (JCF) could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of an affected device. The vulnerability is due to improper neutralization of script in attributes in a web page. An attacker could exploit this vulnerability by executing arbitrary JavaScript in the Jabber client of the recipient. An exploit could allow the attacker to perform remote code execution. Cisco Bug IDs: CSCve53989.
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Analysis
by VulDB Data Team • 02/04/2021
The vulnerability identified as CVE-2018-0199 resides within Cisco Jabber Client Framework, a component that facilitates communication and collaboration services in enterprise environments. This flaw represents a critical security weakness that affects users of Cisco Jabber clients across multiple platforms including Windows, macOS, and mobile operating systems. The vulnerability stems from inadequate input validation mechanisms within the client framework's web rendering capabilities, specifically failing to properly sanitize user-supplied data before processing it within web page contexts. The affected system components include the client-side web browser engine and the framework's attribute handling mechanisms that process incoming data streams from various communication channels.
The technical exploitation of this vulnerability occurs through cross-site scripting attack vectors where malicious actors craft specially formatted data packets that contain embedded JavaScript code within attributes of web elements. When the vulnerable Jabber client processes these malformed attributes, the embedded scripts execute within the context of the user's session, bypassing normal security boundaries. The improper neutralization of script in attributes creates a persistent threat vector where attackers can inject malicious code that executes with the privileges of the logged-in user. This vulnerability directly maps to CWE-79 which defines Cross-Site Scripting as a condition where untrusted data is sent to a web browser without proper validation or sanitization, allowing attackers to execute arbitrary scripts in the victim's browser. The flaw specifically manifests when the client framework processes HTML attributes containing unescaped JavaScript code, creating an execution environment where malicious payloads can be interpreted and executed by the underlying web engine.
The operational impact of this vulnerability extends beyond simple script execution, as it creates a potential pathway for complete system compromise through remote code execution capabilities. An attacker who successfully exploits this vulnerability can manipulate the Jabber client to perform actions such as accessing stored credentials, modifying user settings, intercepting communications, or establishing persistent access points within the enterprise network. The remote nature of the attack means that threat actors do not require physical access or local network privileges to exploit the vulnerability, making it particularly dangerous in corporate environments where Jabber clients are widely deployed. The attack surface is further expanded as Jabber clients often maintain access to sensitive corporate data, including contact information, chat histories, and potentially integration with enterprise applications, providing attackers with valuable reconnaissance data and access points for further exploitation. This vulnerability aligns with ATT&CK technique T1059.007 which describes the use of scriptlets for execution, and T1071.004 which covers application layer protocol usage for command and control communications.
Mitigation strategies for CVE-2018-0199 should prioritize immediate patch deployment through Cisco's official security advisories and software updates, as the vendor has released fixes specifically addressing the input validation flaws within the Jabber Client Framework. Network segmentation and monitoring controls should be implemented to detect anomalous traffic patterns that may indicate exploitation attempts, particularly focusing on outbound communications from client systems that could indicate successful payload execution. Organizations should also implement strict input validation policies for all user-supplied data within Jabber environments, including the deployment of web application firewalls that can detect and block malicious script injection attempts. Security awareness training for end users should emphasize the dangers of opening suspicious messages or clicking on untrusted links within Jabber clients, as social engineering remains a common initial vector for exploitation. Additionally, privileged access controls should be enforced to limit the potential damage from successful exploitation, ensuring that even if an attacker gains code execution capabilities, they cannot escalate privileges or access critical system resources without additional authentication. The implementation of regular vulnerability assessments and penetration testing focused on client-side applications will help identify similar weaknesses in other enterprise collaboration tools and prevent future incidents.