3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
106 lines
4.1 KiB
Text
106 lines
4.1 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-01:68 Security Advisory
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FreeBSD, Inc.
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Topic: xsane port uses insecure temporary file handling
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Category: ports
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Module: xsane
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Announced: 2001-12-17
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Credits: Tim Waugh <twaugh@redhat.com>, michal@harddata.com
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Affects: Ports collection prior to the correction date
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Corrected: 2001-12-14 01:58:36 UTC
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FreeBSD only: NO
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I. Background
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The XSane application is a gtk based X11 front-end to the SANE
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(Scanner Access Now Easy) library used to interface with scanners.
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XSane will acquire images using devices such as scanners and cameras.
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II. Problem Description
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XSane creates temporary files in /tmp during the process of scanning
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images and to communicate with SANE (the back-end application which
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actually performs the scans) during image preview and save.
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However XSane creates temporary files using mktemp(3), which can be
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easily predicted (see the BUGS section of the mktemp(3) man page).
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This makes XSane vulnerable to exploit, opening the opportunity for a
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user's files to be overwritten through a race condition.
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The xsane port is not installed by default, nor is it "part of
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FreeBSD" as such: it is part of the FreeBSD ports collection, which
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contains over 6000 third-party applications in a ready-to-install
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format. The ports collection shipped with FreeBSD 4.4 contains this
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problem since it was discovered after the release.
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FreeBSD makes no claim about the security of these third-party
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applications, although an effort is underway to provide a security
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audit of the most security-critical ports.
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III. Impact
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A local user may be able to cause xsane (run by another user) to
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overwrite any file for which the latter user has sufficient privilege.
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While it is advisable to run XSane with a non-privileged user account,
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many users run it using the root account, increasing the risk.
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IV. Workaround
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1) Deinstall the xsane port/package if you have it installed.
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V. Solution
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1) Upgrade your entire ports collection and rebuild the port.
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2) Deinstall the old package and install a new package dated after the
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correction date, obtained from the following directories:
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[i386]
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/graphics/xsane-0.82.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/graphics/xsane-0.82.tgz
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[alpha]
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Packages are not automatically generated for the alpha architecture at
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this time due to lack of build resources.
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NOTE: It may be several days before updated packages are available. Be
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sure to check the file creation date on the package, because the
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version number of the software has not changed.
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3) Download a new port skeleton for the xsane port from:
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http://www.freebsd.org/ports/
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and use it to rebuild the port.
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4) Use the portcheckout utility to automate option (3) above. The
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portcheckout port is available in /usr/ports/devel/portcheckout or the
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package can be obtained from:
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz
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VI. Correction details
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The following list contains the revision numbers of each file that was
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corrected in the FreeBSD ports collection.
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Path Revision
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- -------------------------------------------------------------------------
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ports/graphics/xsane/Makefile 1.30
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ports/graphics/xsane/distinfo 1.20
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ports/graphics/xsane/pkg-plist 1.18
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- -------------------------------------------------------------------------
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