CVE-2001-0850 in Openlinux
Summary
by MITRE
A configuration error in the libdb1 package in OpenLinux 3.1 uses insecure versions of the snprintf and vsnprintf functions, which could allow local or remote users to exploit those functions with a buffer overflow.
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Analysis
by VulDB Data Team • 06/04/2018
The vulnerability identified as CVE-2001-0850 represents a critical security flaw within the libdb1 package distributed with OpenLinux 3.1 operating system. This issue stems from the inclusion of insecure implementations of fundamental string manipulation functions snprintf and vsnprintf within the database library. These functions are essential components for safely handling string formatting operations in C programming environments and are widely used throughout system applications and services. The insecure versions of these functions fail to properly validate input lengths against buffer boundaries, creating a fundamental weakness that can be exploited by malicious actors.
The technical flaw manifests through improper buffer size validation during string formatting operations. When applications utilizing the vulnerable libdb1 package call snprintf or vsnprintf with user-supplied input, the insecure implementations do not adequately check whether the formatted output would exceed the allocated buffer space. This leads to predictable buffer overflow conditions where excess data can overwrite adjacent memory locations. The vulnerability is particularly dangerous because it affects core system libraries that multiple applications depend upon, amplifying the potential impact across the entire system. Attackers can exploit this weakness to execute arbitrary code, potentially gaining unauthorized access to system resources or causing system instability through controlled memory corruption.
The operational impact of this vulnerability extends beyond simple local exploitation to include potential remote attack vectors depending on how the affected system services are configured. Local users can leverage the buffer overflow to escalate privileges or execute malicious code within their current session context. Remote exploitation becomes possible when vulnerable applications or services accept user input through network interfaces and subsequently invoke the insecure snprintf functions. The implications for system security are severe as this flaw can be used to compromise the integrity and confidentiality of system data, potentially allowing attackers to establish persistent access or disrupt system operations. Given that this vulnerability affects a core database library, the attack surface includes any application that relies on libdb1 for database operations or general string handling functionality.
Mitigation strategies for CVE-2001-0850 should focus on immediate remediation through system updates and patches provided by OpenLinux vendors. Organizations must prioritize upgrading to patched versions of the libdb1 package that contain secure implementations of snprintf and vsnprintf functions. System administrators should conduct comprehensive vulnerability assessments to identify all applications dependent on the vulnerable library and ensure proper patch deployment across all affected systems. Additional defensive measures include implementing input validation controls at application level to reduce the impact of potential exploitation attempts, though this approach is considered less robust than addressing the root cause through proper patching. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of how insecure library implementations can create widespread security risks throughout computing environments. From an ATT&CK perspective, this vulnerability maps to techniques involving privilege escalation and code injection, making it a significant concern for organizations maintaining systems running the affected OpenLinux 3.1 distributions.