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FreeBSD texindex Unsafe Temporary Files May Let Local Users Gain Elevated Privileges
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SecurityTracker Alert ID: 1015468
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SecurityTracker URL: http://securitytracker.com/id?1015468
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CVE Reference: CVE-2005-3011
(Links to External Site)
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Date: Jan 11 2006
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Impact: Modification of system information, Modification of user information, User access via local system
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Fix Available: Yes
Vendor Confirmed: Yes
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Advisory: FreeBSD Security Advisory
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Description: A vulnerability was reported in texindex on FreeBSD. A local user may be able to obtain elevated privileges on the target system.
The texindex(1) utility uses temporary files in an unsafe manner. The sort_offline() function uses maketempname() which does not
check to see if the filename already exists and also creates files with predictable file names. As a result, a local user can create
a symbolic link (symlink) from a critical file on the system to a temporary file to be used by texindex. Then, when the target
user runs texindex, the symlinked file may be overwritten with the privileges of the target user.
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Impact: A local user may be able to cause files to be modified with the privileges of the target user running texindex.
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Solution: FreeBSD has provided the following fix information [quoted]:
Perform one of the following:
1) Upgrade your vulnerable system
to 4-STABLE, 5-STABLE, or 6-STABLE,
or to the RELENG_6_0, RELENG_5_4, RELENG_5_3, RELENG_4_11, or
RELENG_4_10 security branch
dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD
4.10,
4.11, 5.3, 5.4, and 6.0 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP
signature using your PGP utility.
[FreeBSD 4.x and 5.x]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:01/texindex5x.patch
#
fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:01/texindex5x.patch.asc
[FreeBSD 6.x]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:01/texin
dex.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:01/texindex.patch.asc
b) Execute the following commands
as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/gnu/usr.bin/texinfo/libtxi
# make obj && make depend && make
#
cd /usr/src/gnu/usr.bin/texinfo/texindex
# make obj && make depend && make && make install
The vendor's advisory is available
at:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:01.texindex.asc
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Vendor URL: www.freebsd.org/security/ (Links to External Site)
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Cause: Access control error, State error
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Underlying OS: UNIX (FreeBSD)
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Reported By: FreeBSD Security Advisories <security-advisories@freebsd.org>
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Wed, 11 Jan 2006 10:21:56 GMT
From: FreeBSD Security Advisories <security-advisories@freebsd.org>
Subject: FreeBSD Security Advisory FreeBSD-SA-06:01.texindex [REVISED]
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
=============================================================================
FreeBSD-SA-06:01.texindex Security Advisory
The FreeBSD Project
Topic: Texindex temporary file privilege escalation
Category: contrib
Module: texinfo
Announced: 2006-01-11
Credits: Frank Lichtenheld
Affects: All FreeBSD releases.
Corrected: 2006-01-11 08:02:16 UTC (RELENG_6, 6.0-STABLE)
2006-01-11 08:03:18 UTC (RELENG_6_0, 6.0-RELEASE-p2)
2006-01-11 08:03:55 UTC (RELENG_5, 5.4-STABLE)
2006-01-11 08:04:33 UTC (RELENG_5_4, 5.4-RELEASE-p9)
2006-01-11 08:05:54 UTC (RELENG_5_3, 5.3-RELEASE-p24)
2006-01-11 08:06:47 UTC (RELENG_4, 4.11-STABLE)
2006-01-11 08:07:18 UTC (RELENG_4_11, 4.11-RELEASE-p14)
2006-01-11 08:08:08 UTC (RELENG_4_10, 4.10-RELEASE-p20)
CVE Name: CAN-2005-3011
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit
<URL:http://www.freebsd.org/security/>.
0. Revision History.
v1.0 2006-01-11 Initial release.
v1.1 2006-01-11 Corrected instructions for rebuilding texindex.
I. Background
TeX is a document typesetting system which is popular in the mathematics,
physics, and computer science realms because of its ability to typeset
complex mathematical formulas. texindex(1) is a utility which is often
used to generate a sorted index of a TeX file.
II. Problem Description
The "sort_offline" function used by texindex(1) employs the "maketempname"
function, which produces predictable file names and fails to validate that
the paths do not exist.
III. Impact
These predictable temporary file names are problematic because they
allow an attacker to take advantage of a race condition in order to
execute a symlink attack, which could enable them to overwrite files
on the system in the context of the user running the texindex(1) utility.
IV. Workaround
No workaround is available, but the problematic code is only executed
if the input file being processed is 500kB or more in length; as a
result, users working with documents of less than several hundred pages
are very unlikely to be affected.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 4-STABLE, 5-STABLE, or 6-STABLE,
or to the RELENG_6_0, RELENG_5_4, RELENG_5_3, RELENG_4_11, or
RELENG_4_10 security branch dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 4.10,
4.11, 5.3, 5.4, and 6.0 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
[FreeBSD 4.x and 5.x]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:01/texindex5x.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:01/texindex5x.patch.asc
[FreeBSD 6.x]
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:01/texindex.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:01/texindex.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/gnu/usr.bin/texinfo/libtxi
# make obj && make depend && make
# cd /usr/src/gnu/usr.bin/texinfo/texindex
# make obj && make depend && make && make install
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Branch Revision
Path
- -------------------------------------------------------------------------
RELENG_4
contrib/texinfo/util/texindex.c 1.1.1.3.2.4
RELENG_4_11
src/UPDATING 1.73.2.91.2.15
src/sys/conf/newvers.sh 1.44.2.39.2.18
contrib/texinfo/util/texindex.c 1.1.1.3.2.3.6.1
RELENG_4_10
src/UPDATING 1.73.2.90.2.21
src/sys/conf/newvers.sh 1.44.2.34.2.22
contrib/texinfo/util/texindex.c 1.1.1.3.2.3.4.1
RELENG_5
contrib/texinfo/util/texindex.c 1.1.1.7.4.1
RELENG_5_4
src/UPDATING 1.342.2.24.2.18
src/sys/conf/newvers.sh 1.62.2.18.2.14
contrib/texinfo/util/texindex.c 1.1.1.7.8.1
RELENG_5_3
src/UPDATING 1.342.2.13.2.27
src/sys/conf/newvers.sh 1.62.2.15.2.29
contrib/texinfo/util/texindex.c 1.1.1.7.6.1
RELENG_6
contrib/texinfo/util/texindex.c 1.1.1.8.2.1
RELENG_6_0
src/UPDATING 1.416.2.3.2.7
src/sys/conf/newvers.sh 1.69.2.8.2.3
contrib/texinfo/util/texindex.c 1.1.1.8.4.1
- -------------------------------------------------------------------------
VII. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-3011
The latest revision of this advisory is available at
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:01.texindex.asc
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