CVE-2003-0541 in gtkhtml
Summary
by MITRE
gtkhtml before 1.1.10, as used in Evolution, allows remote attackers to cause a denial of service (crash) via a malformed message that causes a null pointer dereference.
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Analysis
by VulDB Data Team • 05/31/2019
The vulnerability identified as CVE-2003-0541 represents a critical denial of service flaw affecting gtkhtml versions prior to 1.1.10 when integrated into the Evolution email client. This vulnerability stems from insufficient input validation mechanisms within the html rendering component that processes email messages containing malformed content. The flaw manifests when the gtkhtml parser encounters specially crafted email messages that contain malformed html structures or invalid data sequences, triggering an unexpected null pointer dereference condition within the application's memory management subsystem.
The technical implementation of this vulnerability operates through a classic buffer overflow pattern where the application attempts to access memory locations that have not been properly initialized or allocated. When Evolution processes an email message containing malformed html content, the gtkhtml rendering engine fails to properly validate the input structure, leading to a scenario where a null pointer is dereferenced during the parsing process. This condition violates fundamental memory safety principles and results in an immediate application crash, effectively rendering the email client unusable for the affected user. The vulnerability specifically impacts the html rendering functionality that handles rich text email messages, making it particularly dangerous in environments where users frequently receive complex email formats.
From an operational perspective, this vulnerability creates significant disruption in email communication workflows, particularly within enterprise environments where Evolution serves as a primary email client. The denial of service condition prevents users from accessing their email inbox entirely, requiring manual intervention to restart the application and potentially resulting in data loss if the crash occurs during active email processing. The attack vector is straightforward and requires minimal technical expertise to exploit, making it particularly dangerous in environments with limited security awareness. Security professionals should note that this vulnerability aligns with CWE-476 which specifically addresses null pointer dereference conditions, and represents a common pattern that has been frequently exploited in email client applications throughout the early 2000s.
The mitigation strategy for CVE-2003-0541 involves immediate patch deployment to upgrade gtkhtml to version 1.1.10 or later, which contains the necessary input validation fixes and memory safety improvements. Organizations should implement comprehensive patch management procedures to ensure all instances of Evolution and dependent applications are updated promptly. Network administrators should consider implementing email filtering mechanisms that can detect and quarantine potentially malicious email content before it reaches end-user inboxes, though this approach should complement rather than replace direct patching. The remediation process should also include user education regarding safe email handling practices and the importance of keeping email client software updated. Security monitoring should be enhanced to detect unusual application crash patterns that may indicate exploitation attempts, while adherence to secure coding practices should be reinforced throughout development processes to prevent similar vulnerabilities in future software releases.
This vulnerability demonstrates the critical importance of proper input validation in email processing applications and highlights how seemingly minor flaws in html parsing components can result in complete application compromise. The impact extends beyond individual user inconvenience to potentially disrupting business communication workflows and requiring significant IT support resources for resolution. Organizations should maintain comprehensive vulnerability management programs that include regular security assessments of email client applications and their underlying components to identify and remediate similar issues before they can be exploited in production environments.