CVE-2017-10870 in Rakuraku Hagaki
Summary
by MITRE
Memory corruption vulnerability in Rakuraku Hagaki (Rakuraku Hagaki 2018, Rakuraku Hagaki 2017, Rakuraku Hagaki 2016) and Rakuraku Hagaki Select for Ichitaro (Ichitaro 2017, Ichitaro 2016, Ichitaro 2015, Ichitaro Pro3, Ichitaro Pro2, Ichitaro Pro, Ichitaro 2011, Ichitaro Government 8, Ichitaro Government 7, Ichitaro Government 6 and Ichitaro 2017 Trial version) allows attackers to execute arbitrary code with privileges of the application via specially crafted file.
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Analysis
by VulDB Data Team • 12/02/2019
This memory corruption vulnerability affects a suite of Japanese document processing applications including Rakuraku Hagaki and Ichitaro software products. The flaw exists in how these applications handle specially crafted input files, creating a condition where memory becomes corrupted during file processing operations. The vulnerability represents a critical security risk as it allows attackers to escalate privileges and execute arbitrary code with the same permissions as the targeted application. The affected software versions span multiple years including 2016, 2017, 2018, and various Ichitaro editions, indicating a persistent flaw across the product line. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, where insufficient bounds checking allows memory corruption to occur when processing malformed input data.
The technical exploitation of this vulnerability requires an attacker to craft a malicious file that triggers the memory corruption during application processing. When the vulnerable software opens or processes such a file, the corrupted memory state allows for code execution control. The privilege escalation aspect means that successful exploitation would enable attackers to run malicious code with the application's current user privileges, potentially leading to system compromise. This vulnerability is particularly concerning because it targets office productivity software commonly used in business environments where sensitive data is processed regularly. The attack vector involves social engineering techniques where users might unknowingly open malicious files, making this a prevalent threat in targeted phishing campaigns.
The operational impact of this vulnerability extends beyond simple code execution to potential system compromise and data breaches. Organizations using these applications face significant risk as attackers could leverage this flaw to gain unauthorized access to sensitive documents and corporate data. The vulnerability's persistence across multiple software versions indicates that it may be a fundamental design flaw in how these applications process external input files. Network security teams should consider this vulnerability when assessing their attack surface, particularly in environments where these legacy applications are still in use. The affected applications are widely deployed in Japanese business environments, making this vulnerability a significant concern for organizations in that region and beyond. This type of vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter, as successful exploitation could enable attackers to execute commands through the compromised application.
Mitigation strategies should focus on immediate software updates and patches provided by the vendors, though legacy systems may not receive support. Organizations should implement strict file validation policies and user education programs to prevent opening untrusted documents. Network segmentation and application whitelisting can help reduce the attack surface, while monitoring for suspicious file processing activities can aid in early detection. Security teams should also consider implementing sandboxing techniques for document processing to isolate potentially malicious files. Given the long support cycles of office software, organizations should establish robust patch management procedures to address such vulnerabilities promptly. The vulnerability's nature suggests that regular security assessments of document processing applications should be part of routine security audits to identify similar memory corruption flaws before they can be exploited.