CVE-2001-0858 in Openunix
Summary
by MITRE
Buffer overflow in pppattach and other linked PPP utilities in Caldera Open Unix 8.0 and UnixWare 7.1.0 and 7.1.1 allows local users to gain privileges.
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Analysis
by VulDB Data Team • 10/21/2024
The vulnerability identified as CVE-2001-0858 represents a critical buffer overflow flaw affecting the pppattach utility and related Point-to-Point Protocol (PPP) tools within Caldera Open Unix 8.0 and UnixWare 7.1.0 and 7.1.1 operating systems. This issue stems from inadequate input validation mechanisms within the PPP utilities, specifically in how they handle command-line arguments and configuration parameters. The buffer overflow occurs when the system processes user-supplied data without proper bounds checking, allowing an attacker to overwrite adjacent memory locations in the program's execution space.
The technical implementation of this vulnerability leverages the fundamental weakness in memory management practices where the pppattach utility fails to validate the length of input parameters before copying them into fixed-size buffers. When local users execute the utility with specially crafted arguments exceeding the allocated buffer space, the excess data overflows into adjacent memory regions, potentially corrupting program execution flow. This memory corruption can be exploited to manipulate the program's instruction pointer or other critical control structures, enabling privilege escalation from standard user level to root privileges. The vulnerability specifically aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of how improper input validation can lead to arbitrary code execution.
From an operational perspective, this vulnerability poses significant security risks to systems running the affected Unix versions as it requires only local user access to exploit. The attack vector is particularly concerning because it can be executed by any user with login privileges on the system, making it an attractive target for both malicious insiders and external attackers who have gained initial access. The privilege escalation capability means that compromised systems can be used to establish persistent access, escalate privileges to administrative levels, and potentially serve as a foothold for further network infiltration. The vulnerability's impact extends beyond immediate privilege escalation as it can be combined with other techniques to create more sophisticated attack chains, potentially enabling full system compromise.
The exploitation of CVE-2001-0858 aligns with several tactics described in the ATT&CK framework, particularly those related to privilege escalation and execution of malicious code. The vulnerability can be classified under T1068, which covers 'Exploitation for Privilege Escalation', and T1059, which covers 'Command and Scripting Interpreter'. Security professionals should consider this vulnerability as part of broader exploitation patterns that often occur during initial compromise phases. Organizations should implement immediate mitigations including patching the affected systems, disabling unnecessary PPP utilities, and monitoring for suspicious execution patterns of pppattach and related utilities. Additionally, the vulnerability demonstrates the importance of input validation and proper memory management practices in system security, reinforcing the need for comprehensive code review processes and adherence to secure coding standards.
The remediation approach for this vulnerability requires immediate system patching from the vendor, as the affected versions of Caldera Open Unix and UnixWare contain the vulnerable code that cannot be easily modified through configuration changes. System administrators should also consider implementing additional security controls such as mandatory access controls, privilege separation, and regular security audits to prevent exploitation of similar vulnerabilities. The vulnerability serves as a historical example of how seemingly minor input validation flaws can result in severe privilege escalation capabilities, emphasizing the critical importance of secure coding practices and thorough security testing of system utilities. Organizations maintaining legacy systems should conduct comprehensive vulnerability assessments to identify and remediate similar buffer overflow conditions that may exist in other system components or third-party applications.