CVE-2010-5251 in Lotus Notes
Summary
by MITRE
Multiple untrusted search path vulnerabilities in IBM Lotus Notes 8.5 allow local users to gain privileges via a Trojan horse (1) nnoteswc.dll or (2) nlsxbe.dll file in the current working directory, as demonstrated by a directory that contains a .vcf, .vcs, or .ics file. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 12/13/2021
The vulnerability identified as CVE-2010-5251 represents a critical privilege escalation issue within IBM Lotus Notes 8.5 software, specifically targeting the application's dynamic library loading mechanism. This vulnerability falls under the category of untrusted search path exploitation, where malicious actors can manipulate the software's execution flow by placing specially crafted dynamic link libraries in the current working directory. The flaw affects the software's ability to properly validate library paths during the loading process, creating an opportunity for local attackers to execute arbitrary code with elevated privileges.
The technical implementation of this vulnerability exploits the software's failure to properly sanitize or validate the search paths used when loading dynamic libraries. When Lotus Notes processes files with extensions such as .vcf, .vcs, or .ics, which are commonly used for calendar and contact information exchange, the application attempts to load supporting libraries from the current working directory without adequate path validation. The specific libraries targeted are nnoteswc.dll and nlsxbe.dll, which when placed in the working directory by an attacker, get loaded and executed with the privileges of the running Lotus Notes process. This behavior directly violates the principle of least privilege and creates a direct path for privilege escalation attacks.
The operational impact of this vulnerability extends beyond simple local privilege escalation, as it provides attackers with a persistent foothold within the target system. Once an attacker successfully places the malicious DLL files in the working directory and triggers the vulnerable file processing functionality, they can execute code with the same privileges as the Lotus Notes application. This could potentially allow for complete system compromise, especially if the Lotus Notes application is running with administrative privileges or has access to sensitive data repositories. The vulnerability is particularly concerning because it leverages legitimate file processing functionality to achieve malicious objectives, making detection more challenging and the attack vector more隐蔽.
This vulnerability aligns with CWE-427 Uncontrolled Search Path Element, which specifically addresses the issue of applications using untrusted search paths for dynamic library loading. The attack pattern corresponds to techniques described in the MITRE ATT&CK framework under T1068, which covers local privilege escalation through exploitation of software vulnerabilities. The fact that the vulnerability can be triggered through common file types like .vcf, .vcs, and .ics demonstrates how attackers can leverage routine software functionality to establish malicious execution paths. Organizations should consider implementing additional security controls such as application whitelisting, directory permissions management, and monitoring for unauthorized DLL placements in critical directories. The vulnerability also highlights the importance of proper input validation and secure coding practices, particularly when dealing with dynamic library loading mechanisms in enterprise applications.