CVE-2011-1218 in Lotus Notes
Summary
by MITRE
Buffer overflow in kvarcve.dll in Autonomy KeyView, as used in IBM Lotus Notes before 8.5.2 FP3, allows remote attackers to execute arbitrary code via a crafted .zip attachment, aka SPR PRAD8E3NSP. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 11/08/2021
The vulnerability identified as CVE-2011-1218 represents a critical buffer overflow flaw within the kvarcve.dll component of Autonomy KeyView technology, which was integrated into IBM Lotus Notes prior to version 8.5.2 Fix Pack 3. This vulnerability stems from inadequate input validation mechanisms when processing compressed archive files, specifically .zip attachments, creating a pathway for remote code execution attacks. The flaw affects the document processing capabilities of Lotus Notes when it attempts to parse and display content from maliciously crafted zip files, making it particularly dangerous in email environments where users frequently encounter attachments from untrusted sources.
The technical implementation of this vulnerability resides in the kvarcve.dll library's handling of compressed file structures, where insufficient bounds checking allows attackers to overflow memory buffers during decompression operations. When a user opens a specially crafted zip file, the malicious payload can overwrite adjacent memory locations, potentially allowing an attacker to inject and execute arbitrary code with the privileges of the affected application. This buffer overflow condition aligns with CWE-121, which describes heap-based buffer overflow vulnerabilities where insufficient checks allow data to be written beyond allocated buffer boundaries. The vulnerability demonstrates characteristics consistent with CWE-787, heap-based buffer overflow, and CWE-125, out-of-bounds read, as the system fails to properly validate input lengths against allocated memory space.
The operational impact of this vulnerability extends beyond simple remote code execution, as it enables attackers to gain unauthorized access to systems running vulnerable versions of IBM Lotus Notes. The attack surface is particularly broad since email systems typically process numerous attachment types automatically, and users may inadvertently open malicious zip files without recognizing the threat. This vulnerability can be exploited through social engineering campaigns where attackers craft convincing email attachments designed to trigger the buffer overflow when opened by unsuspecting users. The attack vector is classified as remote due to the ability to deliver malicious attachments through email or web-based channels, making it suitable for large-scale exploitation campaigns.
Mitigation strategies for CVE-2011-1218 should prioritize immediate application of IBM's security patches, specifically targeting the 8.5.2 Fix Pack 3 release which addressed this specific vulnerability. Organizations should implement email filtering mechanisms to quarantine or block suspicious zip attachments, particularly those with executable content or unusual compression patterns. Network segmentation and access controls can help limit the potential damage if exploitation occurs, while security monitoring systems should be configured to detect unusual file processing patterns or memory allocation anomalies. The vulnerability's exploitation aligns with ATT&CK technique T1059, command and script interpreter, as attackers can leverage the compromised system to execute arbitrary commands. Additionally, implementing principle of least privilege access controls and regular security assessments can help reduce the attack surface and prevent unauthorized code execution in the event of successful exploitation attempts.