CVE-2016-2870 in WebSphere DataPower XC10 appliance
Summary
by MITRE
Buffer overflow in the CLI on IBM WebSphere DataPower XC10 appliances 2.1 and 2.5 allows remote authenticated users to cause a denial of service via unspecified vectors.
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Analysis
by VulDB Data Team • 02/15/2019
The vulnerability identified as CVE-2016-2870 represents a critical buffer overflow flaw within the command line interface of IBM WebSphere DataPower XC10 appliances running software versions 2.1 and 2.5. This issue resides in the appliance's CLI implementation and affects the system's ability to process input commands properly. The buffer overflow condition occurs when authenticated users submit specially crafted input to the CLI, which can lead to unexpected behavior and system instability. The vulnerability specifically targets the input handling mechanisms within the appliance's command interface, making it particularly dangerous as it requires only authentication credentials to exploit, not necessarily administrative privileges or physical access. The affected appliances operate in environments where they process sensitive data flows and network traffic, making them attractive targets for attackers seeking to disrupt services or gain further access to network infrastructure. This vulnerability falls under the CWE-121 buffer overflow category, which is classified as a critical weakness in software design and implementation. The attack vector is particularly concerning because it can be executed remotely by authenticated users, meaning that an attacker with valid credentials can trigger the vulnerability from any location within the network perimeter. The impact of this vulnerability extends beyond simple denial of service, as it can potentially be leveraged to execute arbitrary code or escalate privileges within the appliance's operating environment.
The technical implementation of this buffer overflow stems from insufficient bounds checking within the CLI processing functions of the DataPower appliance software. When legitimate authenticated users submit commands containing excessive input data, the system fails to properly validate the length of input parameters before copying them into fixed-size memory buffers. This classic buffer overflow condition allows attackers to overwrite adjacent memory locations, potentially corrupting critical system data or execution pointers. The vulnerability manifests through the appliance's command processing pipeline where input strings are parsed and executed without adequate validation of their length or content. Attackers can exploit this by crafting malicious CLI commands that exceed the allocated buffer space, causing memory corruption that leads to system crashes or unexpected behavior. The specific vectors that trigger this condition remain unspecified in the public disclosure, which suggests that multiple input parameters or command sequences can cause the overflow. This lack of specificity increases the attack surface and makes the vulnerability more difficult to defend against completely. The exploitability of this flaw is enhanced by the fact that authentication is required, which means that attackers must first obtain valid credentials, but this is often achievable through social engineering, credential reuse attacks, or other initial compromise techniques. The vulnerability demonstrates poor input validation practices that are commonly associated with weak software security design principles, and it represents a failure to implement proper memory management controls within the appliance's command processing framework.
The operational impact of CVE-2016-2870 extends significantly beyond immediate denial of service conditions, creating potential cascading failures within enterprise network infrastructure that relies on DataPower appliances for security services. When the CLI buffer overflow occurs, the appliance may crash or become unresponsive, disrupting network traffic flows and potentially causing service interruptions that affect multiple downstream systems. The appliance's role in processing and filtering network traffic means that a successful exploit can lead to complete service outages for applications that depend on DataPower for security services such as SSL termination, XML processing, or API mediation. Organizations using these appliances may experience significant operational disruption as network services become unavailable, potentially resulting in financial losses and compliance violations. The vulnerability also presents a potential escalation path for attackers who may attempt to use the appliance as a pivot point for further attacks within the network. The fact that this vulnerability affects versions 2.1 and 2.5 indicates that it has existed for some time, meaning that organizations may have been exposed to risk for extended periods without detection. The remote execution capability of this vulnerability means that attackers can exploit it from outside the organization's network perimeter, potentially allowing for unauthorized access to internal systems. The impact on business continuity is substantial, as DataPower appliances are often deployed in mission-critical security roles where service availability is essential for maintaining business operations and protecting sensitive data assets.
Mitigation strategies for CVE-2016-2870 should focus on both immediate remediation and long-term security hardening of affected DataPower appliances. The most effective immediate solution involves applying the official IBM security patches and firmware updates that address the specific buffer overflow condition in the CLI implementation. Organizations should prioritize updating all affected appliances to versions that contain the necessary security fixes, ensuring that the update process includes proper testing to avoid introducing new compatibility issues. Network segmentation and access control measures should be implemented to limit the scope of potential exploitation, particularly by restricting direct access to the appliance's CLI from untrusted networks. The implementation of network monitoring and intrusion detection systems can help detect unusual CLI activity patterns that might indicate exploitation attempts. Administrative procedures should be enhanced to include regular security assessments of appliance configurations and monitoring of authentication logs for suspicious activities. The vulnerability highlights the importance of implementing defense-in-depth strategies, including regular security audits, vulnerability scanning, and access privilege reviews to minimize the risk of unauthorized exploitation. Organizations should also consider implementing secure configuration baselines for DataPower appliances that disable unnecessary services and reduce the attack surface. The incident underscores the necessity of maintaining current security patches and implementing robust change management processes to ensure that security vulnerabilities are addressed promptly. Additionally, regular staff training on secure configuration practices and vulnerability awareness can help prevent exploitation attempts by reducing the likelihood of credential compromise. The vulnerability serves as a reminder of the critical importance of proper input validation and memory management in software development, particularly for security-critical systems that operate in enterprise environments where reliability and security are paramount.