CVE-2005-3863 in ktools
Summary
by MITRE
Stack-based buffer overflow in kkstrtext.h in ktools library 0.3 and earlier, as used in products such as (1) centericq, (2) orpheus, (3) motor, and (4) groan, allows local users or remote attackers to execute arbitrary code via a long parameter to the VGETSTRING macro.
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Analysis
by VulDB Data Team • 06/13/2019
The vulnerability described in CVE-2005-3863 represents a critical stack-based buffer overflow flaw within the ktools library version 0.3 and earlier. This issue specifically resides in the kkstrtext.h header file and affects multiple software products including centericq, orpheus, motor, and groan. The vulnerability manifests through the VGETSTRING macro when processing excessively long parameters, creating a condition where attacker-controlled input can overwrite adjacent memory on the stack. The flaw demonstrates characteristics consistent with CWE-121, which categorizes stack-based buffer overflow conditions that occur when insufficient bounds checking is performed on data copied to stack buffers. Such vulnerabilities are particularly dangerous because they can be exploited to execute arbitrary code with the privileges of the affected application.
The technical implementation of this vulnerability exploits the fundamental weakness in memory management within the ktools library's string handling mechanisms. When the VGETSTRING macro processes parameter inputs, it fails to properly validate the length of incoming data before copying it to stack-allocated buffers. This allows an attacker to provide a parameter string that exceeds the allocated buffer size, causing a buffer overflow that corrupts the stack frame. The overflow can overwrite return addresses, saved registers, and other critical stack data, enabling potential code execution. The vulnerability is classified as a local or remote exploit depending on the context in which the vulnerable applications operate, with remote exploitation being particularly concerning when these applications are deployed in networked environments where they accept user input.
The operational impact of CVE-2005-3863 extends beyond simple code execution capabilities to encompass broader system compromise scenarios. When successfully exploited, this vulnerability can allow attackers to gain complete control over affected systems running vulnerable versions of the affected applications. The exploitation process typically involves crafting a malicious parameter string that overflows the stack buffer and redirects program execution flow to malicious code. This vulnerability aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, as attackers can leverage the code execution capability to run arbitrary commands on compromised systems. The affected applications, being popular instant messaging and communication tools, present attractive targets for exploitation due to their widespread deployment and user interaction requirements.
Mitigation strategies for CVE-2005-3863 primarily focus on immediate remediation through software updates and code modifications. Organizations should prioritize upgrading to versions of the ktools library that address this buffer overflow vulnerability, specifically versions beyond 0.3. The fix typically involves implementing proper bounds checking within the VGETSTRING macro and other related string handling functions to prevent parameter data from exceeding allocated buffer sizes. Additionally, defensive programming practices should be enforced throughout the codebase, including the adoption of safer string handling functions and runtime buffer overflow detection mechanisms. System administrators should also implement network segmentation and access controls to limit exposure of vulnerable applications to untrusted networks. The vulnerability serves as a prime example of why input validation and bounds checking are fundamental security practices, as highlighted in CWE-122 which addresses heap-based buffer overflow conditions that share similar underlying causes with stack-based variants.