CVE-2003-0089 in HP-UX
Summary
by MITRE
Buffer overflow in the Software Distributor utilities for HP-UX B.11.00 and B.11.11 allows local users to execute arbitrary code via a long LANG environment variable to setuid programs such as (1) swinstall and (2) swmodify.
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Analysis
by VulDB Data Team • 09/22/2024
The vulnerability identified as CVE-2003-0089 represents a critical buffer overflow flaw within the Software Distributor utilities of Hewlett-Packard Unix operating systems. This issue affects specific versions of HP-UX including B.11.00 and B.11.11, where the flaw manifests in the handling of environment variables by setuid programs. The vulnerability stems from inadequate input validation and bounds checking within the software distribution tools that are designed to manage system software packages and updates. When a local user manipulates the LANG environment variable to an excessive length, the buffer overflow condition occurs, potentially enabling privilege escalation and arbitrary code execution.
The technical implementation of this vulnerability involves the exploitation of a classic buffer overflow in the setuid programs swinstall and swmodify. These programs, which are essential for software installation and modification on HP-UX systems, operate with elevated privileges due to their setuid bit being enabled. The LANG environment variable, which typically specifies the locale and language settings for applications, becomes a vector for exploitation when it exceeds the allocated buffer space. This overflow occurs because the programs do not properly validate the length of the LANG variable before processing it, allowing malicious input to overwrite adjacent memory regions. The CWE-121 category applies here as this represents a stack-based buffer overflow where insufficient bounds checking permits memory corruption. The vulnerability's impact is amplified by the setuid nature of the affected programs, which operate with root privileges, making successful exploitation equivalent to achieving system compromise.
From an operational perspective, this vulnerability presents a significant risk to HP-UX systems running the affected versions, as local users who might not otherwise have administrative access can leverage this flaw to gain elevated privileges. The attack requires only local system access and knowledge of the specific exploitation technique, making it particularly dangerous in multi-user environments where privilege separation is critical. The exploitation process typically involves crafting a specially formatted LANG environment variable that, when processed by the vulnerable programs, causes the buffer overflow to overwrite the return address on the stack. This allows attackers to redirect program execution to malicious code, effectively bypassing standard security controls. The ATT&CK framework categorizes this under privilege escalation techniques, specifically targeting the 'Exploitation for Privilege Escalation' tactic, where local users can leverage software vulnerabilities to gain elevated system access. Organizations running these affected systems face potential data breaches, system compromise, and complete loss of control over their computing resources if this vulnerability is exploited.
The mitigation strategy for CVE-2003-0089 involves immediate implementation of vendor patches provided by Hewlett-Packard to address the buffer overflow in the Software Distributor utilities. System administrators should also implement additional security measures including disabling unnecessary setuid programs, implementing proper environment variable validation, and monitoring for suspicious usage patterns of the affected tools. The principle of least privilege should be enforced by ensuring that only authorized personnel have access to these vulnerable programs. Additionally, organizations should consider implementing runtime protections such as stack canaries and address space layout randomization to make exploitation more difficult. Regular security assessments and vulnerability scanning should be conducted to identify any similar buffer overflow vulnerabilities in other system components. The remediation process should also include education of system administrators about the risks associated with environment variable manipulation and the importance of maintaining current system patches. Proper access controls and privilege management should be implemented to limit the potential impact of such vulnerabilities in the event of successful exploitation, ensuring that even if an attacker gains access, they cannot escalate privileges beyond the initial compromise level.