CVE-2013-0127 in Lotus Notes
Summary
by MITRE
IBM Lotus Notes 8.x before 8.5.3 FP4 Interim Fix 1 and 9.0 before Interim Fix 1 does not block APPLET elements in HTML e-mail, which allows remote attackers to bypass intended restrictions on Java code execution and X-Confirm-Reading-To functionality via a crafted message, aka SPRs JMOY95BLM6 and JMOY95BN49.
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Analysis
by VulDB Data Team • 12/05/2024
The vulnerability identified as CVE-2013-0127 affects IBM Lotus Notes email clients version 8.x prior to 8.5.3 FP4 Interim Fix 1 and version 9.0 prior to Interim Fix 1. This security flaw represents a critical weakness in the email client's HTML rendering engine that fails to properly sanitize applet elements within incoming HTML messages. The vulnerability specifically targets the client-side processing of HTML content where embedded java applets could be executed without proper security restrictions, creating a potential attack vector for remote adversaries seeking to circumvent the intended security boundaries of the email application.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the Lotus Notes email client's HTML parser. When processing incoming email messages containing HTML content, the application fails to adequately filter or block APPLET elements that could contain malicious java code. This oversight allows attackers to craft specially designed email messages that include embedded applets, which can execute within the context of the email client's security model. The vulnerability specifically impacts the X-Confirm-Reading-To functionality, which is a header field used to request read receipts from email recipients, but the malicious applet code can bypass these intended restrictions.
The operational impact of this vulnerability is significant as it enables remote code execution capabilities against vulnerable systems. Attackers can leverage this weakness to execute arbitrary java code on target systems without requiring user interaction beyond opening the malicious email message. The attack vector operates through email delivery where the malicious content is embedded within HTML emails, making it particularly dangerous as it can be delivered through standard email channels. The vulnerability essentially undermines the security model of the email client by allowing java applets to run with elevated privileges that should be restricted by default.
This vulnerability aligns with CWE-749, which covers "Exposed Dangerous Method or Function," and represents a failure in proper input sanitization and security boundary enforcement. From an attacker perspective, this flaw maps to techniques described in the MITRE ATT&CK framework under T1203, which covers "Exploitation for Client Execution," and T1059, covering "Command and Scripting Interpreter." The vulnerability demonstrates a classic case of insufficient sanitization leading to code execution, making it particularly attractive to threat actors seeking to compromise email clients. Organizations using vulnerable versions of IBM Lotus Notes face potential data breaches, system compromise, and unauthorized access to sensitive corporate information.
The recommended mitigation strategy involves applying the appropriate security patches and interim fixes released by IBM for both the 8.5.3 FP4 and 9.0 versions. Organizations should also implement email filtering solutions that can detect and block HTML content containing applet elements, while considering disabling java applet execution entirely within email clients. Additionally, user education regarding the risks of opening untrusted email content and implementing network-level controls to prevent access to malicious domains can provide additional layers of protection against exploitation attempts.