CVE-2017-6182 in Web Appliance
Summary
by MITRE
In Sophos Web Appliance (SWA) before 4.3.1.2, a section of the machine's interface responsible for generating reports was vulnerable to remote command injection via functions, aka NSWA-1304.
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Analysis
by VulDB Data Team • 11/24/2024
The Sophos Web Appliance vulnerability identified as CVE-2017-6182 represents a critical remote command injection flaw that existed in SWA versions prior to 4.3.1.2. This vulnerability specifically targeted the report generation functionality within the appliance's web interface, creating a pathway for remote attackers to execute arbitrary commands on the underlying system. The flaw emerged from insufficient input validation and sanitization within the reporting module, allowing malicious actors to inject command sequences that would be executed with the privileges of the web application process. This vulnerability falls under the Common Weakness Enumeration category CWE-77, which specifically addresses improper neutralization of special elements used in commands, and aligns with ATT&CK technique T1059.001 for command and scripting interpreter. The affected component responsible for report generation was particularly susceptible because it failed to properly sanitize user-supplied parameters that were directly passed to system command execution functions, creating a direct injection vector for malicious payloads. The implications of this vulnerability extend beyond simple command execution as it could potentially allow attackers to gain full system control, escalate privileges, and access sensitive data stored within the appliance's environment.
The operational impact of CVE-2017-6182 was severe for organizations utilizing affected Sophos Web Appliance versions, as it provided attackers with a straightforward method to compromise network security infrastructure. Attackers could leverage this vulnerability to execute commands such as spawning reverse shells, modifying system configurations, accessing internal network resources, or exfiltrating sensitive information from the appliance's storage. The vulnerability's remote nature meant that attackers did not require physical access or local network presence to exploit the flaw, making it particularly dangerous for organizations with exposed web interfaces. Security administrators faced the challenge of identifying compromised systems and implementing immediate mitigations, as the vulnerability could be exploited by automated scanning tools and malicious actors operating at scale. The report generation functionality was particularly concerning because it likely required minimal user interaction to trigger the vulnerability, potentially allowing for automated exploitation across multiple systems. Organizations that relied on the appliance for web content filtering, security monitoring, and network access control found their defensive capabilities compromised, potentially enabling attackers to bypass security controls and gain unauthorized access to protected networks.
Organizations affected by CVE-2017-6182 should have implemented immediate mitigations including upgrading to Sophos Web Appliance version 4.3.1.2 or later, which contained the necessary patches to address the command injection vulnerability. The remediation process required careful planning to ensure that the upgrade did not disrupt existing network security operations, as the appliance likely served critical functions within the organization's security infrastructure. Network segmentation and access controls should have been strengthened around the appliance to limit potential exploitation vectors, while monitoring systems should have been enhanced to detect unusual command execution patterns that might indicate exploitation attempts. Security teams needed to conduct comprehensive vulnerability assessments to identify other potential attack surfaces that might share similar flaws, as the vulnerability indicated possible broader issues with input validation within the appliance's web interface. Additionally, organizations should have reviewed their incident response procedures to ensure readiness for potential exploitation scenarios, including establishing protocols for detecting and containing command injection attacks. The vulnerability highlighted the importance of maintaining current security patches and implementing robust input validation controls across all web applications, as the flaw demonstrated how insufficient sanitization of user inputs could lead to complete system compromise. Organizations were also advised to consider implementing additional security layers such as web application firewalls and network-based intrusion detection systems to provide defense-in-depth against similar exploitation attempts.