CVE-2019-4441 in WebSphere Application Server
Summary
by MITRE
IBM WebSphere Application Server 7.0, 8.0, 8.5, 9.0, and Liberty could allow a remote attacker to obtain sensitive information when a stack trace is returned in the browser. IBM X-Force ID: 163177.
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Analysis
by VulDB Data Team • 12/29/2023
IBM WebSphere Application Server versions 7.0, 8.0, 8.5, 9.0, and Liberty editions contain a vulnerability that exposes sensitive system information through improper error handling mechanisms. This flaw allows remote attackers to retrieve detailed stack trace information directly in browser responses, potentially revealing critical system internals including file paths, class names, and internal application structures. The vulnerability stems from the server's failure to properly sanitize error responses, which violates security best practices for error handling and information disclosure prevention. According to CWE-209, this represents a weakness in error handling that can lead to information exposure, while the ATT&CK framework categorizes this under T1211 - Exploitation for Defense Evasion and T1083 - File and Directory Discovery as attackers can leverage the exposed information for further exploitation attempts.
The technical implementation of this vulnerability occurs when the application server encounters an exception during request processing and returns the stack trace directly to the client without proper sanitization. This behavior exposes the underlying system architecture, including Java class hierarchies, method signatures, and potentially sensitive configuration details. The exposure is particularly concerning because stack traces often contain information about the application's internal structure, including database connection details, file system locations, and component versions that could be exploited by attackers. This vulnerability is classified as a remote information disclosure issue, meaning attackers do not require any special privileges or local access to exploit the flaw, making it particularly dangerous in production environments.
The operational impact of this vulnerability extends beyond simple information disclosure, as the exposed stack traces provide attackers with valuable reconnaissance data for planning more sophisticated attacks. Attackers can use the information to identify specific application components, understand the server configuration, and potentially discover other vulnerabilities within the system. The exposure of internal application paths and class names can facilitate targeted attacks against specific components, while the presence of version information can help attackers determine if other known vulnerabilities exist within the same system. This information can be combined with other reconnaissance techniques to develop more effective attack vectors, making the vulnerability a significant risk to overall system security.
Organizations should implement immediate mitigations including configuring the application server to disable detailed error messages in production environments, implementing proper error handling mechanisms that sanitize all error responses, and ensuring that stack traces are not exposed to end users. The recommended approach involves configuring the server to return generic error messages to clients while logging detailed information internally for administrators. Security teams should also implement web application firewalls that can detect and block requests that might trigger stack trace responses, and establish monitoring procedures to detect unusual error response patterns. Additionally, regular security assessments should be conducted to ensure that no other similar vulnerabilities exist within the application server configuration, as this type of information exposure vulnerability can often indicate broader security misconfigurations that require comprehensive remediation.