FreeBSD /etc/rc startup script symbolic link could be used to delete arbitrary directories

freebsd-rc-delete-directories (9217) The risk level is classified as MediumMedium Risk


FreeBSD could allow a local attacker to delete arbitrary directories, caused by a vulnerability in the /etc/rc startup script. When removing X Window System lock files, rc fails to properly check whether /tmp/.X11-unix is a real directory. A local attacker could exploit this vulnerability by creating a symbolic link from /tmp/.X11-unix to an arbitrary directory on the system, which would be deleted the next time the system is booted.


File Manipulation


Upgrade to latest version of 4.5-STABLE or to either of the RELENG_4_5 (4.5-RELEASE-p6) or RELENG_4_4 (4.4-RELEASE-p13) security branches dated later than 9-May-2002), as listed in FreeBSD Inc., Security Advisory FreeBSD-SA-02:27.rc. See References.

— OR —

Apply the appropriate patch for your system, as listed in FreeBSD Inc., Security Advisory FreeBSD-SA-02:27.rc t. See References.


Platforms Affected:

  • FreeBSD FreeBSD 4.0
  • FreeBSD FreeBSD 4.4
  • FreeBSD FreeBSD 4.5


May 29, 2002

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