CVE-2015-0903 in Saitoh Kikaku Maruo
Summary
by MITRE
Buffer overflow in Saitoh Kikaku Maruo Editor 8.51 and earlier allows remote attackers to execute arbitrary code via a crafted .hmbook file.
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Analysis
by VulDB Data Team • 04/17/2018
The vulnerability identified as CVE-2015-0903 represents a critical buffer overflow flaw within the Saitoh Kikaku Maruo Editor version 8.51 and earlier implementations. This software, commonly used for handling specific document formats, contains a programming error that manifests when processing maliciously crafted .hmbook files. The buffer overflow occurs during the parsing of these files, where insufficient input validation allows an attacker to overflow memory buffers and potentially overwrite adjacent memory regions. Such vulnerabilities fall under the common weakness enumeration CWE-121, which specifically addresses stack-based buffer overflow conditions that can lead to arbitrary code execution. The flaw is particularly dangerous because it enables remote code execution, meaning attackers can exploit this vulnerability from outside the target network without requiring local access or authentication.
The technical exploitation of this vulnerability requires careful crafting of .hmbook files that contain malicious data structures designed to trigger the buffer overflow condition. When the vulnerable editor application processes these specially constructed files, the overflow allows attackers to manipulate the program execution flow by overwriting return addresses or function pointers within the stack memory. This manipulation can redirect program execution to malicious code injected into the buffer, effectively allowing remote attackers to execute arbitrary commands with the privileges of the affected application. The vulnerability is classified as a remote exploit because the malicious .hmbook file can be delivered through various attack vectors including email attachments, web downloads, or malicious websites, making it particularly dangerous for widespread deployment.
From an operational impact perspective, this vulnerability creates significant security risks for organizations using the affected Maruo Editor software. The ability to execute arbitrary code remotely without user interaction makes this vulnerability particularly attractive to threat actors seeking to establish persistent access to compromised systems. Security professionals should note that this vulnerability aligns with techniques described in the attack pattern taxonomy under the MITRE ATT&CK framework, specifically relating to initial access and execution phases where adversaries leverage software vulnerabilities to gain unauthorized access. The exploitability of this flaw means that organizations may face unauthorized data access, system compromise, or potential lateral movement within their network environments. Additionally, the vulnerability affects not only individual user systems but also enterprise environments where the software may be deployed across multiple endpoints, amplifying the potential impact of a successful exploitation attempt.
Organizations should immediately implement mitigations including updating to the latest version of the Maruo Editor software where the buffer overflow has been patched and addressed. System administrators should also consider implementing network-based protections such as email filtering rules that block .hmbook file attachments from untrusted sources, and application whitelisting policies that restrict execution of unauthorized software. Security monitoring should be enhanced to detect unusual file processing activities or attempts to access vulnerable software components. The vulnerability serves as a reminder of the importance of keeping software applications updated and maintaining comprehensive vulnerability management programs that can quickly identify and remediate such critical security flaws across enterprise environments.