From security-advisories@freebsd.org Thu Jul 13 01:36:28 2000 From: FreeBSD Security Advisories To: BUGTRAQ@SECURITYFOCUS.COM Date: Wed, 7 Jun 2000 16:21:17 -0700 Subject: FreeBSD Security Advisory: FreeBSD-SA-00:22.apsfilter -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-00:22 Security Advisory FreeBSD, Inc. Topic: apsfilter allows users to execute arbitrary commands as user lpd Category: ports Module: apsfilter Announced: 2000-06-07 Credits: Fixed by vendor. Affects: Ports collection. Corrected: 2000-04-29 Vendor status: Updated version released. FreeBSD only: NO I. Background apsfilter is a print filter which automatically handles the conversion of various types of file into a format understood by the printer. II. Problem Description The apsfilter port, versions 5.4.1 and below, contain a vulnerability which allow local users to execute arbitrary commands as the user running lpd, user root in a default FreeBSD installation. The apsfilter software allows users to specify their own filter configurations, which are read in an insecure manner and may be used to elevate privileges. The apsfilter port is not installed by default, nor is it "part of FreeBSD" as such: it is part of the FreeBSD ports collection, which contains over 3300 third-party applications in a ready-to-install format. The ports collection shipped with FreeBSD 4.0 contains this problem since it was discovered after the release. FreeBSD makes no claim about the security of these third-party applications, although an effort is underway to provide a security audit of the most security-critical ports. III. Impact Local users can cause arbitrary commands to be executed as root. If you have not chosen to install the apsfilter port/package, then your system is not vulnerable to this problem. IV. Workaround Deinstall the apsfilter port/package, if you you have installed it. V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the apsfilter port. 2) Deinstall the old package and install a new package dated after the correction date, obtained from: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/print/apsfilter-5.4.2.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/print/apsfilter-5.4.2.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/print/apsfilter-5.4.2.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/print/apsfilter-5.4.2.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/print/apsfilter-5.4.2.tgz 3) download a new port skeleton for the apsfilter port from: http://www.freebsd.org/ports/ and use it to rebuild the port. 4) Use the portcheckout utility to automate option (3) above. The portcheckout port is available in /usr/ports/devel/portcheckout or the package can be obtained from: ftp://ftp.freebsd.org/pub/FreeBSD/ports/packages/devel/portcheckout-1.0.tgz -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBOT7YnFUuHi5z0oilAQExcgP/T7U8rtKfUE6sn3QiLrhVueX/h06gvUtp aSwqtd4EVS8FMbnMARs+TAcrLUVQBaHf7RA0LtIHhD441HNUmC0mbtL0GJQr1tI4 3H5tfqav7y3C0PiLe+4yy4HPjhOcZtOneldIf76hU+HiaCwWo6uBvv7ue3z1IIJQ o6BuABiKzE0= =S7V8 -----END PGP SIGNATURE-----