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)
130 lines
5 KiB
Text
130 lines
5 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
|
|
Hash: SHA1
|
|
|
|
=============================================================================
|
|
FreeBSD-SA-06:02.ee Security Advisory
|
|
The FreeBSD Project
|
|
|
|
Topic: ee temporary file privilege escalation
|
|
|
|
Category: core
|
|
Module: ee
|
|
Announced: 2006-01-11
|
|
Credits: Christian S.J. Peron
|
|
Affects: All FreeBSD versions
|
|
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: CVE-2006-0055
|
|
|
|
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/>.
|
|
|
|
I. Background
|
|
|
|
The ee utility is a simple screen oriented text editor. This editor is
|
|
popular with a lot of users due to its ease of use.
|
|
|
|
II. Problem Description
|
|
|
|
The ispell_op function used by ee(1) while executing spell check
|
|
operations employs an insecure method of temporary file generation.
|
|
This method produces predictable file names based on the process ID
|
|
and fails to confirm which path will be over written with the user.
|
|
|
|
It should be noted that ispell does not have to be installed in order
|
|
for this to be exploited. The option simply needs to be selected.
|
|
|
|
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 allow them to overwrite files
|
|
on the system in the context of the user running the ee(1) editor.
|
|
|
|
IV. Workaround
|
|
|
|
Instead of invoking ispell through ee(1), invoke it directly.
|
|
|
|
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.
|
|
|
|
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:02/ee.patch
|
|
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:02/ee.patch.asc
|
|
|
|
b) Execute the following commands as root:
|
|
|
|
# cd /usr/src
|
|
# patch < /path/to/patch
|
|
# cd /usr/src/usr.bin/ee
|
|
# 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
|
|
usr.bin/ee/ee.c 1.16.2.9
|
|
RELENG_4_11
|
|
src/UPDATING 1.73.2.91.2.15
|
|
src/sys/conf/newvers.sh 1.44.2.39.2.18
|
|
usr.bin/ee/ee.c 1.16.2.7.6.1
|
|
RELENG_4_10
|
|
src/UPDATING 1.73.2.90.2.21
|
|
src/sys/conf/newvers.sh 1.44.2.34.2.22
|
|
usr.bin/ee/ee.c 1.16.2.7.4.1
|
|
RELENG_5
|
|
usr.bin/ee/ee.c 1.31.4.2
|
|
RELENG_5_4
|
|
src/UPDATING 1.342.2.24.2.18
|
|
src/sys/conf/newvers.sh 1.62.2.18.2.14
|
|
usr.bin/ee/ee.c 1.31.4.1.2.1
|
|
RELENG_5_3
|
|
src/UPDATING 1.342.2.13.2.27
|
|
src/sys/conf/newvers.sh 1.62.2.15.2.29
|
|
usr.bin/ee/ee.c 1.31.6.1
|
|
RELENG_6
|
|
usr.bin/ee/ee.c 1.32.2.1
|
|
RELENG_6_0
|
|
src/UPDATING 1.416.2.3.2.7
|
|
src/sys/conf/newvers.sh 1.69.2.8.2.3
|
|
usr.bin/ee/ee.c 1.32.4.1
|
|
- -------------------------------------------------------------------------
|
|
|
|
VII. References
|
|
|
|
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0055
|
|
|
|
The latest revision of this advisory is available at
|
|
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:02.ee.asc
|
|
-----BEGIN PGP SIGNATURE-----
|
|
Version: GnuPG v1.4.2 (FreeBSD)
|
|
|
|
iD8DBQFDxL4YFdaIBMps37IRAlL2AJ4x+2WoVU3OJMEab2ch6sbBRaLoogCglFSE
|
|
n4bkyDA2e6afV7tG4ja8foA=
|
|
=42lw
|
|
-----END PGP SIGNATURE-----
|