CVE-2000-0520 in Pop Dump
Summary
by MITRE
Buffer overflow in restore program 0.4b17 and earlier in dump package allows local users to execute arbitrary commands via a long tape name.
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Analysis
by VulDB Data Team • 12/07/2024
The vulnerability identified as CVE-2000-0520 represents a critical buffer overflow flaw within the restore program version 0.4b17 and earlier implementations of the dump package. This issue resides in the handling of tape names during backup restoration operations, creating a pathway for malicious exploitation that can result in arbitrary code execution. The flaw specifically manifests when the restore utility processes tape names that exceed predetermined buffer limits, allowing attackers to overwrite adjacent memory locations through carefully crafted input sequences. The dump package serves as a fundamental component in unix-like operating systems for managing backup operations, making this vulnerability particularly dangerous as it directly impacts system integrity and security posture.
The technical implementation of this buffer overflow stems from inadequate input validation within the restore utility's tape name processing routine. When a user provides a tape name exceeding the allocated buffer size, the program fails to enforce bounds checking, permitting memory corruption that can be leveraged to overwrite critical program variables or return addresses. This vulnerability operates under the Common Weakness Enumeration category CWE-121, which classifies buffer overflow conditions where insufficient bounds checking allows memory to be overwritten. The attack vector requires local system access, as the exploit must be executed from within the target environment, though this limitation does not diminish its potential impact on system compromise. Attackers can craft malicious tape names that overwrite the program's execution flow, potentially leading to privilege escalation or complete system control.
The operational impact of this vulnerability extends beyond simple code execution, as it can enable attackers to gain unauthorized access to system resources and potentially escalate privileges within the affected environment. Since the restore program typically operates with elevated privileges during backup restoration processes, successful exploitation could allow attackers to execute commands with higher permissions than initially granted. This makes the vulnerability particularly concerning for systems where backup operations are performed with administrative privileges, as it could provide a persistent backdoor or escalation path into the system. The attack requires minimal sophistication and can be automated, making it attractive to both malicious actors and security researchers. The vulnerability affects systems running the affected versions of the dump package, which were commonly found in unix and linux environments during the early 2000s.
Mitigation strategies for CVE-2000-0520 primarily focus on immediate version updates and input validation enhancements. System administrators should upgrade to versions of the dump package that contain fixed implementations of the restore utility, specifically versions beyond 0.4b17 where buffer overflow protections have been implemented. Additionally, implementing strict input validation controls within the restore program can prevent malicious tape names from being processed, including length restrictions and character set validation. The implementation of stack protection mechanisms and address space layout randomization can provide additional defense in depth against exploitation attempts. Organizations should also consider implementing least privilege principles for backup operations, ensuring that restore processes do not execute with unnecessary elevated privileges. Regular security audits and vulnerability assessments should include checks for outdated dump package versions, while system monitoring should be enhanced to detect anomalous backup operations that might indicate exploitation attempts. These measures align with the defensive strategies recommended by the attack framework, particularly focusing on preventing privilege escalation and maintaining system integrity through proper input handling.