Descriptiondebian/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).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)
Debian Bugs869153

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
tor (PTS)wheezy0.2.4.27-1fixed
wheezy (security)
jessie (security), jessie0.2.5.14-1fixed
stretch (security), stretch0.2.9.11-1~deb9u1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
torsourcejessie(not affected)
torsourcewheezy(not affected)


[stretch] - tor <no-dsa> (Minor issue)
[jessie] - tor <not-affected> (aa-exec in jessie is located in /usr/sbin/)
[wheezy] - tor <not-affected> (aa-exec in jessie is located in /usr/sbin/)

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