CVE-2020-25215 in yEd Desktop
Summary
by MITRE
yWorks yEd Desktop before 3.20.1 allows XXE attacks via an XML or GraphML document.
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Analysis
by VulDB Data Team • 09/18/2020
The vulnerability identified as CVE-2020-25215 affects yWorks yEd Desktop software versions prior to 3.20.1, presenting a critical XML External Entity (XXE) attack vector that could compromise system security. This flaw enables malicious actors to exploit the application's handling of XML and GraphML document formats, which are commonly used for creating and managing graph diagrams and visual representations. The vulnerability stems from insufficient input validation and processing of external entity references within the XML parsing mechanism, allowing attackers to craft specially formatted documents that trigger unintended behavior when opened by the vulnerable application.
The technical implementation of this XXE vulnerability occurs during the parsing of XML or GraphML files within the yEd Desktop environment. When the application processes these documents, it fails to properly sanitize external entity declarations, enabling attackers to include malicious external references in the XML content. This weakness specifically manifests when the application attempts to resolve external entities or DTD (Document Type Definition) references, potentially allowing for file disclosure, remote code execution, or denial of service conditions. The vulnerability is particularly concerning because yEd Desktop applications are frequently used in enterprise environments where diagram files may be shared between users, creating opportunities for attackers to deliver malicious payloads through seemingly benign graph documents.
The operational impact of this vulnerability extends beyond simple data exposure, potentially enabling attackers to access sensitive files on the victim's system, perform server-side request forgery attacks, or even execute arbitrary code depending on the system configuration and privileges. In enterprise settings where yEd Desktop is widely deployed, this vulnerability could allow attackers to escalate privileges or gain unauthorized access to internal network resources through the exploitation of unpatched systems. The attack surface is broad since GraphML and XML formats are commonly used in various business processes, making it likely that users will encounter and open malicious documents without proper security awareness. This vulnerability aligns with CWE-611 (Improper Restriction of XML External Entity Reference) and represents a significant risk to information security in environments where diagramming tools are extensively used.
Organizations should implement immediate mitigation strategies including updating to yWorks yEd Desktop version 3.20.1 or later, which contains proper XML parsing controls and external entity restrictions. Security teams should also consider implementing network-level controls to prevent access to external resources during XML processing, as well as educating users about the risks of opening untrusted diagram files. The ATT&CK framework categorizes this vulnerability under T1213 (Data from Information Repositories) and potentially T1059 (Command and Scripting Interpreter) when exploitation leads to code execution. Additional protective measures include configuring the application to disable external entity resolution entirely, implementing content filtering for diagram files, and establishing robust patch management processes to ensure timely deployment of security updates across all systems. Organizations should also conduct vulnerability assessments to identify any systems running vulnerable versions and prioritize remediation efforts based on risk exposure and system criticality.