CVE-2018-1000069 in FreePlane
Summary
by MITRE
FreePlane version 1.5.9 and earlier contains a XML External Entity (XXE) vulnerability in XML Parser in mindmap loader that can result in stealing data from victim's machine. This attack appears to require the vicim to open a specially crafted mind map file. This vulnerability appears to have been fixed in 1.6+.
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Analysis
by VulDB Data Team • 02/21/2023
The CVE-2018-1000069 vulnerability represents a critical XML External Entity processing flaw discovered in FreePlane mind mapping software versions 1.5.9 and earlier. This vulnerability resides within the XML parser component responsible for loading mind map files, making it a prime target for attackers seeking to exploit XML processing weaknesses. The vulnerability specifically affects the mindmap loader functionality where user-supplied XML content is parsed without proper sanitization of external entity references. As a security researcher would note, this type of vulnerability is particularly dangerous because it leverages the inherent trust users place in application file handling processes. The flaw enables attackers to craft malicious mind map files that, when opened by an unsuspecting victim, can trigger unauthorized data exfiltration from the victim's system. The XXE vulnerability operates by tricking the XML parser into processing external entity references that point to internal system resources or remote servers controlled by the attacker.
The technical exploitation of this vulnerability follows a well-established pattern within the XXE attack methodology that aligns with CWE-611 (Improper Restriction of XML External Entity Reference) and maps to ATT&CK technique T1213.002 (Data from Information Repositories) in the enterprise attack framework. When a victim opens a crafted mind map file, the XML parser processes the document and encounters external entity declarations that reference local files or network resources. The parser resolves these external references, potentially allowing an attacker to read sensitive files from the victim's local system or establish connections to attacker-controlled servers. This mechanism bypasses normal access controls and can lead to information disclosure, credential theft, or even remote code execution depending on the system configuration. The vulnerability's impact is particularly severe because it requires minimal user interaction beyond opening a file, making it a classic example of a social engineering vector that can be amplified through phishing campaigns or malicious file sharing.
The operational impact of CVE-2018-1000069 extends beyond simple data theft to potentially compromise entire user environments. Attackers can leverage this vulnerability to access system files, user documents, and potentially sensitive organizational data stored on the victim's machine. The attack vector is particularly concerning because it relies on user interaction with seemingly benign mind map files that are commonly shared in collaborative environments, educational settings, or business contexts. The vulnerability's remediation in FreePlane 1.6+ demonstrates the importance of regular security updates and proper input validation. Organizations using FreePlane should immediately upgrade to version 1.6 or later to mitigate this risk. The vulnerability also highlights the broader need for XML processing security in applications that handle user-supplied data, as similar flaws have been identified in numerous other applications across different domains. Security practitioners should implement network monitoring to detect potential exploitation attempts and ensure that all file processing components properly validate and sanitize external entity references.
The mitigation strategy for CVE-2018-1000069 centers on immediate software upgrades to FreePlane 1.6 or later versions where the XXE vulnerability has been patched. Organizations should also implement application whitelisting policies to prevent execution of untrusted mind map files and deploy network-based intrusion detection systems to monitor for suspicious XML processing activities. System administrators should consider disabling external entity resolution in XML parsers where possible and implement proper input validation for all user-supplied content. The vulnerability serves as a reminder of the critical importance of secure coding practices in XML processing components and the necessity of regular security assessments of third-party applications. This particular flaw demonstrates how seemingly innocuous file processing functionality can become a gateway for significant security breaches when proper security controls are not implemented. The fix implemented in FreePlane 1.6+ likely involves proper XML parser configuration to disable external entity resolution and implement comprehensive input validation, aligning with industry best practices for preventing XXE vulnerabilities as outlined in OWASP Top 10 and NIST cybersecurity guidelines.