CVE-2015-8488 in Office
Summary
by MITRE
Cybozu Office 10.3.0 allows remote attackers to read image files via a crafted e-mail message, a different vulnerability than CVE-2015-8487.
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Analysis
by VulDB Data Team • 07/30/2018
The vulnerability identified as CVE-2015-8488 affects Cybozu Office version 10.3.0 and represents a critical security flaw that enables remote attackers to access image files through malicious email messages. This issue specifically targets the email processing capabilities of the software, creating an unauthorized data access vector that could potentially expose sensitive visual content stored within the system. The vulnerability operates independently from CVE-2015-8487, indicating that the security breach manifests through different technical mechanisms within the email handling architecture.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the email message parsing functionality of Cybozu Office. When processing incoming email messages containing crafted attachments or embedded content, the system fails to properly validate the file types and content structure, allowing attackers to manipulate the parsing process to retrieve unauthorized image files. This flaw likely resides in the application's handling of multipart email messages or embedded image references, where proper boundary checking and file access controls are inadequate. The vulnerability can be exploited without requiring authentication or specialized privileges, making it particularly dangerous as it can be triggered through standard email communication channels.
The operational impact of CVE-2015-8488 extends beyond simple data theft, as it represents a significant breach in the email security infrastructure of affected systems. Attackers could potentially access confidential images, documents, or visual data that should remain protected within the organization's email environment. This vulnerability directly impacts the confidentiality aspect of the CIA triad and could lead to intellectual property theft, privacy violations, or exposure of sensitive visual information. The remote nature of the attack means that threat actors can exploit this flaw from anywhere on the internet without physical access to the target system, amplifying the potential damage and attack surface.
Organizations utilizing Cybozu Office 10.3.0 should implement immediate mitigations including updating to the latest available version that addresses this vulnerability, implementing email filtering solutions that scan for suspicious content patterns, and establishing network-level controls to restrict access to potentially malicious email attachments. Security teams should also conduct thorough vulnerability assessments of their email infrastructure and consider implementing additional layers of email security such as sandboxing for suspicious attachments or enhanced content inspection mechanisms. The vulnerability aligns with CWE-20 Improper Input Validation and may be related to ATT&CK technique T1190 Exploit Public-Facing Application, highlighting the need for comprehensive application security hardening measures.
The broader implications of this vulnerability demonstrate the critical importance of robust input validation in email processing systems and highlight the potential for seemingly isolated flaws to create significant security risks. Organizations should maintain updated threat intelligence feeds to monitor for similar vulnerabilities in other collaborative software platforms and ensure that their email security policies account for the specific risks associated with image file handling. Regular security testing and penetration testing of email systems should be conducted to identify potential exploitation vectors and ensure that security controls remain effective against evolving attack techniques.