CVE-2000-0655 in Communicator
Summary
by MITRE
Netscape Communicator 4.73 and earlier allows remote attackers to cause a denial of service or execute arbitrary commands via a JPEG image containing a comment with an illegal field length of 1.
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Analysis
by VulDB Data Team • 12/22/2024
The vulnerability identified as CVE-2000-0655 represents a critical buffer overflow condition within Netscape Communicator version 4.73 and earlier releases. This flaw specifically manifests when the web browser processes JPEG image files that contain malformed comments with an illegal field length of 1. The issue stems from inadequate input validation and memory management within the JPEG parsing component of the browser's image handling subsystem. When the software encounters such a malformed JPEG comment, it fails to properly validate the field length parameter, leading to a situation where the application attempts to allocate memory or process data structures using invalid parameters that exceed expected boundaries.
The technical exploitation of this vulnerability occurs through the manipulation of JPEG file formats during the parsing phase of image rendering. The illegal field length of 1 creates a condition where the parser's internal state becomes corrupted, potentially leading to memory corruption that can be leveraged for arbitrary code execution. This type of vulnerability falls under the category of buffer overflow conditions and aligns with CWE-121 which describes stack-based buffer overflow conditions. The attack vector requires a remote attacker to deliver a specially crafted JPEG image to a victim using the vulnerable Netscape Communicator browser, making this a classic example of a web-based attack that exploits client-side software vulnerabilities.
The operational impact of this vulnerability extends beyond simple denial of service to potentially enable remote code execution on affected systems. When a user accesses a web page containing the malicious JPEG image, the browser's JPEG parser processes the image and triggers the buffer overflow condition. This can result in the application crashing or potentially allowing an attacker to execute arbitrary commands with the privileges of the user running the browser. The vulnerability affects a wide range of users since JPEG images are commonly used on web pages and the attack can be delivered through standard web browsing activities. The impact is particularly severe given that Netscape Communicator was widely deployed in enterprise environments during this time period, making organizations vulnerable to coordinated attacks that could compromise entire networks through individual user exposures.
Mitigation strategies for CVE-2000-0655 primarily involve immediate software updates and patches provided by Netscape to address the buffer overflow condition in their JPEG parsing implementation. Organizations should implement network-level controls to filter or block JPEG content from untrusted sources, as well as deploy intrusion detection systems that can identify and alert on suspicious JPEG file characteristics. Security administrators should also consider implementing browser hardening measures and restricting user privileges when browsing the web. The vulnerability demonstrates the importance of proper input validation and memory management in client-side applications, and serves as a reminder of the critical need for regular security updates and vulnerability management processes. This case study aligns with ATT&CK technique T1203 which describes exploitation of software vulnerabilities for privilege escalation and code execution, emphasizing the need for comprehensive vulnerability remediation strategies that include both immediate patching and long-term security architecture improvements.