CVE-2001-0098 in WebLogic Server
Summary
by MITRE
Buffer overflow in Bea WebLogic Server before 5.1.0 allows remote attackers to execute arbitrary commands via a long URL that begins with a ".." string.
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Analysis
by VulDB Data Team • 10/08/2025
The vulnerability identified as CVE-2001-0098 represents a critical buffer overflow flaw in Bea WebLogic Server versions prior to 5.1.0 that exposes the system to remote command execution attacks. This vulnerability specifically targets the server's handling of Uniform Resource Locators that commence with the ".." string sequence, creating a condition where insufficient input validation allows attackers to overflow memory buffers and potentially execute malicious code with elevated privileges. The flaw resides in the server's URL parsing mechanism, where the application fails to properly sanitize or limit the length of paths that begin with directory traversal sequences, creating an exploitable condition that can be leveraged from remote locations without authentication.
The technical implementation of this vulnerability follows a classic buffer overflow pattern where the WebLogic Server processes URLs containing the ".." prefix without adequate bounds checking. When an attacker crafts a malicious URL with an excessively long path component beginning with "..", the server's internal buffer allocated for processing such paths becomes overwritten, potentially corrupting adjacent memory segments including return addresses and executable code segments. This allows an attacker to redirect program execution flow and inject malicious payload code that executes with the privileges of the WebLogic Server process. The vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-78, which addresses OS command injection vulnerabilities that can occur when user-supplied input is improperly handled.
From an operational impact perspective, this vulnerability creates a severe threat vector that enables remote attackers to gain unauthorized access to the underlying system hosting the WebLogic Server. Successful exploitation can result in complete system compromise, allowing attackers to execute arbitrary commands, access sensitive data, modify system configurations, or establish persistent backdoors. The vulnerability is particularly dangerous because it requires no authentication to exploit, making it an attractive target for automated attacks and malicious actors seeking to compromise enterprise web applications. Organizations running affected WebLogic Server versions face significant risk of data breaches, service disruption, and potential regulatory compliance violations, especially in environments where the server handles sensitive business or personal information.
The mitigation strategy for CVE-2001-0098 involves immediate patching of the WebLogic Server to version 5.1.0 or later, which includes proper input validation and bounds checking for URL processing. System administrators should also implement network-level restrictions such as firewalls that filter out suspicious URL patterns beginning with ".." sequences and limit access to the WebLogic Server to trusted networks only. Additionally, organizations should deploy intrusion detection systems that monitor for patterns consistent with this vulnerability and establish robust input sanitization practices throughout their web application frameworks. The vulnerability demonstrates the importance of implementing secure coding practices and adhering to the principle of least privilege, as outlined in the mitre ATT&CK framework's command and control techniques that leverage such server-side vulnerabilities for initial access and lateral movement within compromised networks. Organizations should also conduct regular security assessments and vulnerability scanning to identify and remediate similar issues in their application stacks, particularly focusing on legacy systems that may contain outdated components vulnerable to buffer overflow attacks.