CVE-2017-1711 in iNotes
Summary
by MITRE
IBM iNotes 8.5 and 9.0 SUService can be misguided into running malicious code from a DLL masquerading as a windows DLL in the temp directory. IBM X-Force ID: 134532.
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Analysis
by VulDB Data Team • 02/03/2021
The vulnerability identified as CVE-2017-1711 affects IBM iNotes versions 8.5 and 9.0, specifically within the SUService component that handles software updates. This issue represents a classic DLL injection attack vector where malicious actors can manipulate the update process to execute arbitrary code on vulnerable systems. The flaw stems from insufficient validation of dynamic link library files during the update installation phase, creating an opportunity for privilege escalation attacks that could compromise entire email infrastructure environments.
The technical implementation of this vulnerability relies on the principle of DLL search order hijacking, where the system loads a malicious DLL from the temporary directory instead of the legitimate system location. This type of attack maps directly to CWE-426 and CWE-74, which address insecure library loading and injection vulnerabilities respectively. The attack vector specifically targets the update service process that operates with elevated privileges, allowing attackers to gain system-level access when the malicious DLL is loaded during the update sequence. The vulnerability demonstrates poor input validation and inadequate security controls around temporary file handling, creating a path for code execution that bypasses normal security boundaries.
From an operational perspective, this vulnerability presents a significant risk to organizations relying on IBM iNotes for email services, as it could allow attackers to establish persistent access to email infrastructure and potentially escalate privileges to administrative levels. The impact extends beyond simple code execution to include potential data exfiltration, lateral movement within networks, and establishment of backdoors for continued access. Attackers could leverage this vulnerability to compromise not only the affected iNotes service but also potentially gain access to underlying Domino servers and associated email databases. The attack requires minimal privileges to initiate and can be automated, making it particularly dangerous for organizations with limited security monitoring capabilities.
Organizations should implement immediate mitigations including disabling automatic updates when possible, implementing strict file system permissions on temporary directories, and deploying application whitelisting solutions to prevent execution of unauthorized DLL files. System administrators should also conduct thorough security audits of all update processes and verify that only legitimate, signed DLLs are loaded during the update cycle. The vulnerability highlights the importance of following secure coding practices such as those outlined in the OWASP Top Ten and NIST Cybersecurity Framework, particularly focusing on input validation and secure library loading. Network segmentation and monitoring of update service processes can help detect anomalous behavior indicative of exploitation attempts, while regular security assessments should be performed to identify similar vulnerabilities in other enterprise applications.