CVE-2013-0589 in iNotes
Summary
by MITRE
IBM iNotes before 8.5.3 Fix Pack 6 and 9.x before 9.0.1 allows remote attackers to bypass the remote image filtering mechanism and obtain sensitive information via a crafted e-mail message. IBM X-Force ID: 83371.
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Analysis
by VulDB Data Team • 04/01/2019
The vulnerability identified as CVE-2013-0589 affects IBM iNotes email client software versions prior to specific fix packs, creating a significant security gap in email content filtering mechanisms. This issue represents a critical flaw in the email system's ability to properly sanitize and validate incoming email content, specifically targeting the remote image filtering functionality that is designed to prevent unauthorized access to internal resources through email attachments and embedded content.
The technical flaw manifests through a crafted email message that can bypass the intended security controls designed to filter remote images in email content. This vulnerability operates at the application layer and leverages improper input validation techniques that fail to adequately inspect or sanitize email content before rendering it within the email client interface. The flaw essentially allows malicious actors to craft email messages that can circumvent the built-in security measures meant to prevent remote image loading from external sources, which typically includes mechanisms to block access to internal network resources or sensitive information.
From an operational impact perspective, this vulnerability enables remote attackers to potentially access sensitive information that would normally be protected by the email filtering mechanisms. The bypass of remote image filtering can lead to unauthorized access to internal network resources, as the email client may be configured to allow image loading from specific trusted domains while still permitting maliciously crafted content to bypass these restrictions. This creates a scenario where attackers can construct emails that appear legitimate to end users while simultaneously enabling them to access internal resources or retrieve sensitive data through the email client's rendering process.
The security implications extend beyond simple information disclosure, as this vulnerability aligns with CWE-20, which describes improper input validation, and represents a classic case of insufficient security controls in web application filtering mechanisms. The attack vector operates through the email protocol and requires minimal privileges to exploit, making it particularly dangerous for organizations that rely on email as a primary communication channel. The vulnerability also relates to ATT&CK technique T1204.002, which involves social engineering through email, as the crafted messages can appear legitimate to users while simultaneously exploiting the security gap.
Organizations should immediately implement the available fix packs for IBM iNotes, specifically upgrading to IBM iNotes 8.5.3 Fix Pack 6 or 9.0.1, as these releases contain the necessary patches to address the remote image filtering bypass. Additionally, network administrators should consider implementing additional email filtering controls, such as enhanced content filtering solutions, email gateway security measures, and network-based intrusion detection systems that can identify and block suspicious email patterns. The mitigation strategy should also include user education regarding suspicious email content and the importance of not clicking on embedded links or images in untrusted emails, as this vulnerability can be exploited through social engineering techniques that make the malicious emails appear legitimate to end users.