It contains a Mach service name, with the executable path /Applications/MicrosoftTeams.app/Contents/TeamsUpdaterDaemon.xpc/Contents/MacOS/TeamsUpdaterDaemon. Listing 1 β Microsoft Teams Updater launchd file Applications/Microsoft Teams.app/Contents/TeamsUpdaterDaemon.xpc/Contents/MacOS/TeamsUpdaterDaemon % sudo plutil -convert xml1 /Library/LaunchDaemons/.plist -o. The XPC service is launched via the /Library/LaunchDaemons/.plist file. User control of the installation package and insufficient package signature validation. The vulnerability is the result of two distinct issues, which if combined, result in an exploitable scenario. We reported the issue to MSRC, but unfortunately Microsoft decided that βthe finding is valid but does not meet our bar for immediate servicing.β While they have since hardened the XPC service, it remains exploitable. Although Microsoft secured these services reasonably well, we will see how small code mistakes can have serious impacts. This blog post shares the details of a vulnerability Offensive Security discovered in the XPC service of Microsoft Teams. Security Operations for Beginners (SOC-100).Exploit Development Prerequisites (EXP-100).
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