McAfee VirusScan for Mac (Virex) before 7.7 patch 1 has weak permissions (0666) for /Library/Application Support/Virex/VShieldExclude.txt, which allows local users to reconfigure Virex to skip scanning of arbitrary files.

VShieldCheck in McAfee VirusScan for Mac (Virex) before 7.7 patch 1 allow local users to change permissions of arbitrary files via a symlink attack on /Library/Application Support/Virex/VShieldExclude.txt, as demonstrated by symlinking to the root crontab file to execute arbitrary commands.

The on-access scanner for McAfee Virex 7.7 for Macintosh, in some circumstances, might not activate when malicious content is accessed from the web browser, and might not prevent the content from being saved, which allows remote attackers to bypass virus protection, as demonstrated using the EICAR test file.