CVE-2014-5501 in Cyberoam
Summary
by MITRE
Stack-based buffer overflow in the diagnose service in the Sophos Cyberoam appliances with CyberoamOS before 10.6.1 GA allows remote attackers to execute arbitrary code via a crafted webpage or file.
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Analysis
by VulDB Data Team • 03/13/2019
The vulnerability identified as CVE-2014-5501 represents a critical stack-based buffer overflow flaw within the diagnose service of Sophos Cyberoam appliances running CyberoamOS versions prior to 10.6.1 GA. This vulnerability exists within the network security appliance's diagnostic functionality, which is designed to provide system administrators with tools for troubleshooting and monitoring network infrastructure. The flaw manifests in the way the diagnose service processes incoming data from web requests, creating an exploitable condition that can be leveraged by remote attackers without requiring authentication or physical access to the device. The vulnerability specifically affects the handling of user-supplied input within the diagnostic service, where insufficient bounds checking allows attackers to overwrite adjacent memory locations on the stack. This type of vulnerability falls under the Common Weakness Enumeration category CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking permits memory corruption through buffer overruns. The attack surface is particularly concerning given that the vulnerable service is accessible via standard web protocols, making exploitation possible from any network location without requiring specialized access privileges.
The technical exploitation of CVE-2014-5501 enables remote code execution through carefully crafted web requests that trigger the buffer overflow condition in the diagnose service. When a maliciously formatted webpage or file is processed by the vulnerable diagnostic service, the attacker can overwrite critical stack memory locations including return addresses and function pointers, allowing them to redirect program execution flow to malicious code injected into the buffer. This capability represents a severe compromise of the appliance's security posture, as it provides attackers with full control over the affected device's operations. The vulnerability's remote exploitability means that attackers can target these appliances from outside the organization's network perimeter, potentially enabling lateral movement and persistent access to internal network resources. The attack vector operates through standard HTTP protocols, making it difficult to distinguish from legitimate diagnostic traffic and complicating detection efforts. Network traffic analysis may not immediately reveal the malicious nature of the requests, as they appear to be normal web service interactions to security monitoring systems. The vulnerability's impact extends beyond simple code execution to include complete system compromise, as the compromised appliance can be used to monitor network traffic, redirect connections, or serve as a pivot point for attacks against other network segments.
The operational impact of CVE-2014-5501 on affected Sophos Cyberoam appliances is catastrophic, as it provides attackers with complete control over the network security device's functionality and access to all systems that the appliance protects. Organizations relying on these appliances for network security face significant risks including unauthorized network access, data exfiltration, and potential disruption of network services. The vulnerability affects the appliance's core diagnostic service, which is typically accessible for legitimate administrative purposes, making the attack surface more extensive than initially apparent. Once exploited, the compromised appliance can be used to intercept and modify network traffic, potentially allowing attackers to bypass security controls, access sensitive data, or establish persistent backdoors within the organization's network infrastructure. The vulnerability's exploitation capability aligns with tactics described in the MITRE ATT&CK framework under the execution and privilege escalation categories, specifically targeting the use of legitimate system tools for malicious purposes. The attack could enable threat actors to perform reconnaissance activities, establish command and control communications, or leverage the appliance as a platform for further network infiltration. Organizations may experience service disruptions, regulatory compliance violations, and potential legal consequences if sensitive information is accessed or compromised through exploitation of this vulnerability.
Mitigation strategies for CVE-2014-5501 must prioritize immediate patching of all affected Sophos Cyberoam appliances to CyberoamOS version 10.6.1 GA or later, which contains the necessary security fixes to address the buffer overflow condition. Network administrators should implement network segmentation and access controls to limit exposure of these appliances to untrusted networks, particularly by restricting direct internet access to diagnostic services. The implementation of web application firewalls and intrusion detection systems can help detect and block exploitation attempts targeting the vulnerable diagnose service. Organizations should also conduct thorough network audits to identify all affected appliances and ensure complete remediation across their infrastructure. Security monitoring should be enhanced to detect anomalous traffic patterns that may indicate exploitation attempts, including unusual diagnostic service requests or attempts to access non-standard ports. Regular vulnerability assessments and penetration testing should be performed to identify similar vulnerabilities in other network security devices and systems. The remediation process should include verification that the patch has been successfully applied and that the vulnerable service is no longer accessible to unauthenticated users. Additionally, organizations should review their incident response procedures to ensure preparedness for potential exploitation of this vulnerability and establish communication protocols for reporting and handling security incidents involving network security appliances.