CVE-2020-21997 in HOME easy
Summary
by MITRE • 04/29/2021
Smartwares HOME easy
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Analysis
by VulDB Data Team • 05/03/2021
CVE-2020-21997 represents a critical vulnerability affecting Smartwares HOME easy software systems that enables unauthorized remote code execution through a specially crafted HTTP request. This vulnerability stems from improper input validation within the web application framework, allowing attackers to inject malicious commands that execute with the privileges of the web server process. The flaw exists in the handling of user-supplied data in HTTP headers, specifically within the authentication and session management components of the software stack.
The technical implementation of this vulnerability aligns with CWE-94, which describes improper control of generation of code, and CWE-79, which addresses cross-site scripting vulnerabilities. Attackers can exploit this weakness by crafting HTTP requests containing malicious payloads that bypass authentication mechanisms and gain access to the underlying system. The vulnerability is particularly dangerous because it operates at the application layer without requiring any prior authentication credentials, making it highly attractive to threat actors seeking persistent access to networked systems.
Operational impact of this vulnerability extends beyond simple unauthorized access, as successful exploitation can result in complete system compromise and data exfiltration. The affected Smartwares HOME easy systems typically serve as home automation hubs that control various connected devices, creating a potential attack vector for broader network infiltration. Security professionals have documented cases where similar vulnerabilities have been weaponized for lateral movement within corporate networks, particularly in environments where home automation systems are integrated with business infrastructure.
Mitigation strategies should prioritize immediate patch deployment from the vendor, as the vulnerability affects the core web application functionality. Network segmentation and firewall rules should be implemented to restrict access to the affected systems, particularly limiting direct internet exposure. Additionally, implementing web application firewalls and monitoring for anomalous HTTP request patterns can help detect exploitation attempts. Organizations should also conduct comprehensive vulnerability assessments to identify any other systems running the same software version that may be similarly affected, as the vulnerability affects the entire Smartwares HOME easy product line rather than isolated components. The ATT&CK framework categorizes this type of vulnerability under T1210 - Exploitation of Remote Services, emphasizing the importance of maintaining up-to-date security controls and implementing robust monitoring procedures to detect and respond to such attacks effectively.