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Vulnerability Vellum 3D Affected MacOS Description CIAC has determined that the demo CD-ROM for the Vellum 3D version 3.0 application is infected with a strain of the MBDF A/B virus. Vellum 3.0 is a high end CAD package for the Macintosh. The CD-ROM containing the updated version and some demo versions is being distributed at no charge by Ashlar Inc. Due to the fact this is a free distribution, the infected CD-ROM may be widely distributed. The cover of the CD-ROM contains the following text: Vellum 3D Version 3.0 for Windows 95 & NT and Power Macintosh Ashlar (c)1997 Ashlar Incorporated. The infected file is: Vellum 3.0 CDROM:Vellum 3.0 Demo-Mac:Vellum The modification date of the file is 6/17/97 Solution Users should not run the Macintosh demo version of Vellum. Other versions of Vellum 3D on the disk, including those for Windows 95 and NT, and the Macintosh update version (not the demo version) are not infected and can be safely used.