CVE-2017-1129 in Notes
Summary
by MITRE
IBM Notes 8.5 and 9.0 is vulnerable to a denial of service. If a user is persuaded to click on a malicious link, it could cause the Notes client to hang and have to be restarted. IBM X-Force ID: 121370.
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Analysis
by VulDB Data Team • 08/31/2024
IBM Notes client versions 8.5 and 9.0 contain a vulnerability that can be exploited through social engineering tactics to trigger a denial of service condition. This flaw manifests when users click on maliciously crafted links that cause the Notes application to become unresponsive and require manual restart to restore functionality. The vulnerability represents a classic client-side attack vector where user interaction is necessary for exploitation, making it particularly concerning in enterprise environments where Notes clients are extensively deployed. The issue stems from insufficient input validation and error handling within the Notes client's processing of web links and external references, creating a scenario where malformed or malicious content can disrupt normal application operation without requiring elevated privileges or complex attack infrastructure.
The technical nature of this vulnerability aligns with CWE-400, which addresses unchecked resource consumption in software applications, and falls under the broader category of denial of service conditions. From an operational perspective, this weakness creates significant business continuity risks as it can affect individual users or potentially impact larger groups if the malicious links are distributed through corporate communication channels. The attack requires user interaction through clicking malicious links, which places this vulnerability in the ATT&CK framework's initial access phase under technique T1566, specifically targeting user execution through malicious links or attachments. The impact is limited to service disruption rather than data compromise or privilege escalation, but the frequency of Notes client usage in corporate environments means that even targeted attacks can cause substantial operational disruption.
Organizations utilizing IBM Notes 8.5 or 9.0 should implement immediate mitigations including user education about phishing and suspicious link clicking behaviors, network-level filtering to block known malicious domains, and application whitelisting to prevent unauthorized content execution. The most effective long-term solution involves upgrading to supported versions of IBM Notes where this vulnerability has been addressed through proper input validation and robust error handling mechanisms. Security teams should monitor for indicators of compromise related to suspicious link activity and implement endpoint detection measures to identify potential exploitation attempts. Additionally, administrators should consider implementing additional layers of security such as email filtering solutions that can detect and quarantine malicious links before they reach end users, thereby reducing the attack surface and preventing the exploitation scenario that leads to the denial of service condition.