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The U.S. Department of Energy
Computer Incident Advisory Center
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INFORMATION BULLETIN
Red Hat "at" Vulnerability
[Red Hat RHSA-2002:015-17]
March 18, 2002 22:00 GMT Number M-057
______________________________________________________________________________
PROBLEM: A heap corruption vulnerability exists in the "at" program that
allows local users to execute arbitrary code.
PLATFORM: Red Hat Linux 6.2 - alpha, i386, sparc
Red Hat Linux 7.0 - alpha, i386
Red Hat Linux 7.1 - alpha, i386, ia64
Red Hat Linux 7.2 - i386, ia64, s390
DAMAGE: A malicious local user could execute arbitrary code. The "at"
command is installed as setuid root, therefore arbitrary code
would be run with root privileges.
SOLUTION: Apply the appropriate RPMs.
______________________________________________________________________________
VULNERABILITY The risk is LOW. A local user account is necessary to exploit
ASSESSMENT: this vulnerability.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/m-057.shtml
ORIGINAL BULLETIN: https://www.redhat.com/support/errata/RHSA-2002-015.html
______________________________________________________________________________
[***** Start Red Hat RHSA-2002:015-17 *****]
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Synopsis: Updated at package available
-----------------------------------------------------------------------
Advisory ID: RHSA-2002:015-17
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Issue Date: 2002-01-15
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Updated On: 2002-03-13
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Product: Red Hat Linux
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Keywords: at security heap corruption environment
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Cross References:
-----------------------------------------------------------------------
Obsoletes:
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1. Topic:
This updated at package fixes two minor problems and one major
problem where the environment can get wiped out prior to the
execution of a scheduled command.
For versions of Red Hat Linux prior to 7.2, this package also
fixes a potential security vulnerability which can result in
heap corruption (Red Hat Linux 7.2 is not vulnerable to this
security exploit).
Update 2002-02-01: The package for Red Hat Linux 6.2 tried to
source a file in /etc/init.d, which doesn't exist on a standard
system.
2. Problem description:
A server running the latest version of at could have commands
that depend on the current environment (for example, the PATH)
which would then fail or run incorrectly because the environment
would not be accessible when the command was executed at a later
time.
Additionally, in versions of Red Hat Linux prior to 7.2 a malicious
local user could specify an execution time is in a carefully
drafted format causing a heap corruption bug. Since the at command
is installed as setuid root this bug can be exploited.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2002-0004 to this issue. Thanks to
zen-parse for reporting this vulnerability.
In addition to the fixed heap corruption, file handling security
on all versions of at has been improved by adding the O_EXCL
(exclusive) option to an open system call.
3. Bug IDs fixed: (see bugzilla for more information)
49491 - all environment is wiped out prior to executing user command
51253 - Wrong pointer to time syntax in man page
52626 - "at" RPM says that /var/spool/at/.SEQ should be executable
4. Relevant releases/architectures:
Red Hat Linux 6.2 - alpha, i386, sparc
Red Hat Linux 7.0 - alpha, i386
Red Hat Linux 7.1 - alpha, i386, ia64
Red Hat Linux 7.2 - i386, ia64, s390
5. RPMs required:
Red Hat Linux 6.2:
SRPMS:
ftp://updates.redhat.com/6.2/en/os/SRPMS/at-3.1.8-22.2.src.rpm
alpha:
ftp://updates.redhat.com/6.2/en/os/alpha/at-3.1.8-22.2.alpha.rpm
i386:
ftp://updates.redhat.com/6.2/en/os/i386/at-3.1.8-22.2.i386.rpm
sparc:
ftp://updates.redhat.com/6.2/en/os/sparc/at-3.1.8-22.2.sparc.rpm
Red Hat Linux 7.0:
SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/at-3.1.8-23.src.rpm
alpha:
ftp://updates.redhat.com/7.0/en/os/alpha/at-3.1.8-23.alpha.rpm
i386:
ftp://updates.redhat.com/7.0/en/os/i386/at-3.1.8-23.i386.rpm
Red Hat Linux 7.1:
SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/at-3.1.8-23.src.rpm
alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/at-3.1.8-23.alpha.rpm
i386:
ftp://updates.redhat.com/7.1/en/os/i386/at-3.1.8-23.i386.rpm
ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/at-3.1.8-23.ia64.rpm
Red Hat Linux 7.2:
SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/at-3.1.8-23.src.rpm
i386:
ftp://updates.redhat.com/7.2/en/os/i386/at-3.1.8-23.i386.rpm
ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/at-3.1.8-23.ia64.rpm
s390:
ftp://updates.redhat.com/7.2/en/os/s390/at-3.1.8-23.s390.rpm
6. 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.
7. Verification:
MD5 sum Package Name
-------------------------------------------------------------------------
beab8c80838d3920d758a2e8e5b5e3b2 6.2/en/os/SRPMS/at-3.1.8-22.2.src.rpm
31a1aac9c620778fe24a5d9c73b468c6 6.2/en/os/alpha/at-3.1.8-22.2.alpha.rpm
a5ea88124398a0b937dd93e93d62c3bd 6.2/en/os/i386/at-3.1.8-22.2.i386.rpm
3ee8b5c53f23d0eae9bd78c69621ff78 6.2/en/os/sparc/at-3.1.8-22.2.sparc.rpm
b1f62f4b41e12a54a1f73d639363a638 7.0/en/os/SRPMS/at-3.1.8-23.src.rpm
97e27a1d2dc0f08d8f118209a891689a 7.0/en/os/alpha/at-3.1.8-23.alpha.rpm
ea793fd803f10c8fa66abb8191fefb9b 7.0/en/os/i386/at-3.1.8-23.i386.rpm
b1f62f4b41e12a54a1f73d639363a638 7.1/en/os/SRPMS/at-3.1.8-23.src.rpm
97e27a1d2dc0f08d8f118209a891689a 7.1/en/os/alpha/at-3.1.8-23.alpha.rpm
ea793fd803f10c8fa66abb8191fefb9b 7.1/en/os/i386/at-3.1.8-23.i386.rpm
8fed88d53824e98f509289c42ea01237 7.1/en/os/ia64/at-3.1.8-23.ia64.rpm
b1f62f4b41e12a54a1f73d639363a638 7.2/en/os/SRPMS/at-3.1.8-23.src.rpm
ea793fd803f10c8fa66abb8191fefb9b 7.2/en/os/i386/at-3.1.8-23.i386.rpm
8fed88d53824e98f509289c42ea01237 7.2/en/os/ia64/at-3.1.8-23.ia64.rpm
b392c294aab8dfa5ec86255d7582fa04 7.2/en/os/s390/at-3.1.8-23.s390.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our key
is available at: http://www.redhat.com/about/contact.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
Note that you need RPM >= 3.0 to check GnuPG keys.
8. References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0004
[***** End Red Hat RHSA-2002:015-17 *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Red Hat, Inc. for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Center, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
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