CVE-2018-0387 in WebEx Teams
Summary
by MITRE
A vulnerability in Cisco Webex Teams (for Windows and macOS) could allow an unauthenticated, remote attacker to execute arbitrary code on the user's device, possibly with elevated privileges. The vulnerability occurs because Cisco Webex Teams does not properly sanitize input. An attacker could exploit the vulnerability by sending a user a malicious link and persuading the user to follow the link. A successful exploit could allow the attacker to execute arbitrary code on the user's system. Cisco Bug IDs: CSCvh66250.
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Analysis
by VulDB Data Team • 03/08/2020
The vulnerability identified as CVE-2018-0387 represents a critical security flaw in Cisco Webex Teams client applications for Windows and macOS operating systems. This issue stems from insufficient input validation mechanisms within the application's processing pipeline, creating a pathway for malicious actors to compromise user devices. The vulnerability specifically affects the desktop client versions that handle web content and user interactions, making it particularly dangerous in enterprise environments where collaboration tools are extensively utilized. The flaw manifests when the application fails to properly sanitize user-supplied data, particularly hyperlinks and web content that users might encounter during normal operation. This inadequate sanitization creates a persistent security gap that can be exploited by threat actors without requiring any authentication credentials or prior access to the target system.
The technical exploitation of this vulnerability follows a well-established attack pattern that aligns with CWE-20, which describes improper input validation as a fundamental weakness in software security. Attackers can craft malicious links that, when clicked by a victim using the vulnerable Webex Teams client, trigger code execution on the target device. The attack vector leverages social engineering techniques where users are tricked into following deceptive links that appear legitimate but contain malicious payloads. The vulnerability's design allows for potential privilege escalation scenarios, meaning that successful exploitation could result in elevated system privileges, potentially enabling attackers to gain deeper access to the compromised system. This represents a significant concern for enterprise security since Webex Teams is widely deployed across organizations and often contains sensitive business communications and data.
The operational impact of CVE-2018-0387 extends beyond individual user compromise to potentially affect entire organizational networks. When exploited, this vulnerability allows attackers to execute arbitrary code remotely, which can lead to data exfiltration, system infiltration, or deployment of additional malware. The attack requires minimal technical expertise from threat actors, making it particularly dangerous as it can be automated and deployed at scale. Organizations using Cisco Webex Teams may experience unauthorized access to their communication infrastructure, potentially leading to intellectual property theft, financial fraud, or regulatory compliance violations. The vulnerability's remote exploit capability means that attackers can target users from anywhere in the world, making traditional network perimeter defenses insufficient to prevent exploitation.
Mitigation strategies for CVE-2018-0387 should focus on immediate patch management and operational security enhancements. Cisco released security updates addressing this vulnerability through their regular software maintenance cycles, and organizations must prioritize deployment of these patches across all affected systems. Network administrators should implement additional monitoring and filtering of web content to detect and block suspicious links before they reach end users. The implementation of email filtering solutions and web proxy configurations can help prevent users from accessing malicious content. Security teams should also consider implementing user awareness training programs to reduce susceptibility to social engineering attacks that exploit this vulnerability. Organizations may need to temporarily disable or restrict Webex Teams functionality until patches are deployed, particularly in high-risk environments where the potential impact of compromise is significant. This vulnerability demonstrates the importance of continuous security monitoring and the need for robust input validation mechanisms in enterprise collaboration tools. The ATT&CK framework categorizes this type of vulnerability under privilege escalation and execution techniques, highlighting the need for layered security approaches that address multiple attack vectors.