CVE-2001-0262 in SmartDownload
Summary
by MITRE
Buffer overflow in Netscape SmartDownload 1.3 allows remote attackers (malicious web pages) to execute arbitrary commands via a long URL.
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Analysis
by VulDB Data Team • 04/12/2025
The vulnerability identified as CVE-2001-0262 represents a critical buffer overflow flaw within Netscape SmartDownload version 1.3 that fundamentally compromises system security through web-based attack vectors. This vulnerability specifically targets the handling of Uniform Resource Locators within the SmartDownload component, creating an exploitable condition that enables remote code execution through malicious web page content. The flaw exists in the manner in which the software processes and validates input data from URLs, particularly when encountering excessively long Uniform Resource Identifiers that exceed the allocated buffer space.
The technical implementation of this vulnerability stems from improper bounds checking and memory management within the Netscape SmartDownload application. When a malicious web page attempts to load a URL exceeding the predetermined buffer limits, the application fails to properly validate the input length, causing a buffer overflow condition. This overflow corrupts adjacent memory regions and can potentially overwrite critical program execution pointers or return addresses, enabling attackers to redirect program flow and execute arbitrary machine code. The vulnerability operates at the application layer, specifically within the URL parsing and handling mechanisms of the SmartDownload component that integrates with web browsers.
The operational impact of this vulnerability extends beyond simple denial of service conditions to encompass full system compromise capabilities. Attackers leveraging this flaw can execute malicious code with the privileges of the affected user, potentially leading to complete system takeover, data exfiltration, or deployment of additional malware. The remote exploitation nature means that victims need only visit a malicious web page to be compromised, making this vulnerability particularly dangerous in widespread exploitation scenarios. This characteristic aligns with ATT&CK technique T1203, which describes the use of malicious web content to execute code on target systems, and follows the pattern of command injection vulnerabilities commonly classified under CWE-121.
Mitigation strategies for this vulnerability require immediate patching of the affected Netscape SmartDownload component to address the buffer overflow condition through proper input validation and bounds checking. Organizations should implement web content filtering solutions to prevent access to known malicious domains and establish network monitoring to detect anomalous URL patterns. Additionally, browser security configurations should be hardened to restrict the execution of potentially malicious download handlers, and users should be educated about the dangers of visiting untrusted websites. The vulnerability demonstrates the critical importance of input validation in preventing buffer overflow attacks and underscores the necessity of maintaining up-to-date security patches across all software components. According to CWE classification, this represents a classic buffer overflow vulnerability that can be mitigated through proper bounds checking and secure coding practices. Organizations should also consider implementing network segmentation and application whitelisting to limit the potential impact of such vulnerabilities in their environments.