CVE-2021-47827
for · for Multiple Products
A high-severity vulnerability has been identified in WebSSH for iOS 14, affecting multiple products from the vendor "for".
Executive summary
A high-severity vulnerability has been identified in WebSSH for iOS 14, affecting multiple products from the vendor "for". This flaw, with a CVSS score of 7.5, could potentially allow an attacker to gain unauthorized access to systems managed through the application, leading to data exposure or further network compromise. Organizations utilizing this software should prioritize the immediate application of security updates to mitigate this significant risk.
Vulnerability
The vulnerability exists within the WebSSH application on iOS 14. An attacker could potentially exploit this flaw by crafting a malicious request or input to the application, which is not properly sanitized. This could lead to unauthorized command execution on the target server connected via the SSH session, session hijacking, or the disclosure of sensitive credentials stored within the application. Successful exploitation requires the attacker to have some level of access or the ability to entice a user to connect to a malicious server.
Business impact
This vulnerability is rated as High severity with a CVSS score of 7.5, posing a significant risk to the organization. Since SSH is commonly used for privileged administrative access to critical servers and network infrastructure, exploitation could have severe consequences. Potential impacts include unauthorized access to sensitive corporate data, deployment of malware or ransomware, lateral movement across the network, and disruption of business-critical services. A compromise of administrative credentials or sessions could lead to a complete system takeover, resulting in significant financial, reputational, and operational damage.
Remediation
Immediate Action: Apply vendor security updates immediately. After patching, it is crucial to monitor for any signs of exploitation attempts that may have occurred prior to remediation by thoroughly reviewing SSH access logs and system audit trails for anomalous activity.
Proactive Monitoring: Security teams should monitor for unusual SSH connection patterns originating from iOS devices, connections from unexpected IP addresses, and abnormal commands executed on managed servers. Implement enhanced logging on jump boxes and critical servers to capture full session details for forensic review if a compromise is suspected.
Compensating Controls: If immediate patching is not feasible, implement compensating controls to reduce the attack surface. These include enforcing the use of a corporate VPN for all SSH access, mandating multi-factor authentication (MFA) on all target SSH servers, and implementing network-level access control lists (ACLs) to restrict SSH connections to trusted IP ranges only. Consider temporarily disabling the application in favor of an alternative, vetted SSH client until patches can be applied.
Exploitation status
Public Exploit Available: false
Analyst recommendation
Given the high severity score of 7.5, this vulnerability requires immediate attention. We strongly recommend that organizations identify all instances of "WebSSH for iOS 14" within their environment and apply the vendor-supplied patches without delay. Although this vulnerability is not currently listed on the CISA KEV catalog, its potential for enabling unauthorized administrative access makes it a critical threat. The remediation and monitoring steps outlined above should be implemented to protect critical infrastructure from potential compromise.