Incorrect implementation of aa-exec in Debian Tor package allows bypassing of AppArmor restrictions

CVE-2017-11565 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:P/A:N

debian/tor.init in the Debian tor_0.2.9.11-1~deb9u1 package for Tor was designed to execute aa-exec from the standard system pathname if the apparmor package is installed, but implements this incorrectly (with a wrong assumption that the specific pathname would remain the same forever), which allows attackers to bypass intended AppArmor restrictions by leveraging the silent loss of this protection mechanism. NOTE: this does not affect systems, such as default Debian stretch installations, on which Tor startup relies on a systemd unit file (instead of this tor.init script).

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