CVE-2010-4548 in Lotus Notes Traveler
Summary
by MITRE
IBM Lotus Notes Traveler before 8.5.1.2 allows remote authenticated users to cause a denial of service (daemon crash) by accepting a meeting invitation with an iNotes client and then accepting this meeting invitation with an iPhone client.
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Analysis
by VulDB Data Team • 01/08/2018
The vulnerability identified as CVE-2010-4548 affects IBM Lotus Notes Traveler versions prior to 8.5.1.2, representing a significant denial of service weakness that can be exploited by authenticated remote attackers. This flaw specifically manifests when a meeting invitation is processed through an iNotes client and subsequently accepted via an iPhone client, creating a cascade of system instability that results in daemon crashes. The vulnerability exploits the interoperability gap between different client implementations within the Lotus Notes ecosystem, where the processing of calendar invitations triggers an unhandled exception in the server-side daemon responsible for managing meeting requests.
The technical root cause of this vulnerability lies in inadequate input validation and error handling within the Lotus Notes Traveler server daemon. When the system receives a meeting invitation processed through the iNotes client, it stores certain metadata or processing flags that are subsequently misinterpreted when the same invitation is accepted through the iPhone client interface. This cross-client processing inconsistency creates a condition where the daemon encounters unexpected data structures or state transitions that trigger a segmentation fault or similar critical error, leading to the complete termination of the service daemon. The vulnerability is classified under CWE-248 as an Uncaught Exception, where the application fails to properly handle exceptional conditions during processing. The flaw demonstrates a classic case of improper error handling in a web-based collaboration platform where different client interfaces generate incompatible data processing paths.
From an operational impact perspective, this vulnerability presents a substantial risk to enterprise environments relying on Lotus Notes Traveler for calendar and meeting management services. The denial of service condition can disrupt business operations by rendering calendar services unavailable to users, potentially affecting critical meeting scheduling and coordination activities. Attackers can repeatedly exploit this weakness to maintain service disruption, making it particularly dangerous in mission-critical environments where continuous availability is essential. The vulnerability affects not only individual user experience but can also impact organizational productivity and collaboration workflows that depend on integrated calendar management. According to ATT&CK framework category T1499, this vulnerability enables an attacker to perform disruption of services, which can be part of broader attack chains targeting business continuity and operational resilience. The remote authentication requirement means that attackers need valid credentials to exploit the vulnerability, but this access is often sufficient to cause significant operational impact in enterprise environments.
The recommended mitigation strategy involves applying the official IBM security patch for Lotus Notes Traveler version 8.5.1.2 or later, which addresses the underlying input validation and error handling issues. Organizations should also implement network segmentation to limit access to the Lotus Notes Traveler service and employ monitoring solutions to detect unusual daemon crash patterns that might indicate exploitation attempts. Additional defensive measures include implementing rate limiting on calendar invitation processing and ensuring that all client interfaces are updated to maintain compatibility with the server-side processing logic. Security teams should also consider conducting regular vulnerability assessments of collaboration platforms and maintaining updated incident response procedures for service disruption events. The patch addresses the core issue by implementing proper exception handling mechanisms and input sanitization procedures that prevent malformed data from causing daemon crashes, thereby aligning with industry best practices for secure software development and maintenance.