CVE-2020-6340 in 3D Visual Enterprise Viewer
Summary
by MITRE
SAP 3D Visual Enterprise Viewer, version - 9, allows a user to open manipulated PCX file received from untrusted sources which results in crashing of the application and becoming temporarily unavailable until the user restarts the application, this is caused due to Improper Input Validation.
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Analysis
by VulDB Data Team • 09/09/2020
SAP 3D Visual Enterprise Viewer version 9 contains a critical vulnerability classified as CVE-2020-6340 that stems from inadequate input validation mechanisms when processing PCX image files. This vulnerability represents a classic example of improper input validation as defined by CWE-20, where the application fails to properly sanitize and validate file inputs before processing them. The flaw specifically manifests when the viewer encounters manipulated PCX files from untrusted sources, creating a scenario where maliciously crafted file content can trigger unexpected application behavior.
The technical execution of this vulnerability involves the application's failure to implement proper boundary checks and input sanitization routines when parsing PCX file headers and data structures. When a user opens a specially crafted PCX file, the viewer's parsing logic encounters malformed data that causes memory corruption or stack overflow conditions. This results in immediate application termination and subsequent system unavailability until manual user intervention is performed to restart the application. The vulnerability operates at the file parsing layer, where the viewer's PCX decoder lacks proper error handling and input validation mechanisms that would normally detect and reject malformed file structures.
From an operational impact perspective, this vulnerability creates significant disruption to business processes that rely on 3D visualization capabilities within SAP environments. The temporary unavailability of the viewer application affects productivity and can potentially interrupt critical design review processes, product visualization workflows, and collaborative engineering activities. The vulnerability's exploitation requires minimal skill level as it only requires the user to open a malicious file, making it particularly dangerous in environments where users may inadvertently encounter compromised files through email attachments, file downloads, or shared network drives. This weakness aligns with ATT&CK technique T1203, where adversaries leverage application vulnerabilities to gain system access through legitimate user interactions.
The mitigation strategies for CVE-2020-6340 should focus on implementing comprehensive input validation controls and restricting file type processing within the viewer application. Organizations should deploy network segmentation controls to limit access to the vulnerable application and implement strict file validation policies that prevent execution of untrusted files. Additionally, SAP has released patches and updates that address this specific vulnerability through improved input validation routines and enhanced file parsing mechanisms. Security teams should also consider implementing application whitelisting solutions that restrict which file types can be processed by the viewer, as well as regular security assessments to identify similar validation weaknesses in other SAP components. The vulnerability demonstrates the critical importance of input validation in preventing denial of service attacks and maintaining application stability in enterprise environments.