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Sicherheit: Pufferüberlauf in crontab
Aktuelle Meldungen Distributionen
Name: Pufferüberlauf in crontab
ID: TLSA2001013
Distribution: TurboLinux
Plattformen: Keine Angabe
Datum: Di, 22. Mai 2001, 13:00
Referenzen: Keine Angabe
Applikationen: vixie-cron

Originalnachricht

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Turbolinux Security Announcement

Package: vixie-cron
Vulnerable Packages: All Turbolinux versions previous to 3.0.1-46
Date: 05/02/2001 5:00 PDT


Affected Turbolinux platforms: TL Server 6.5,
TL 6.1 WorkStation,
All Turbolinux versions
6.0.5 and earlier

Turbolinux Advisory ID#: TLSA2001013

Credits: Vulnerability first discovered by
flatline<achter05@ie.hva.nl>
References: http://marc.theaimsgroup.com/?l=bugtraq&m=98200814418344&w=2

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A security hole has been discovered in the package vixie-cron. Please
update the packages in your installation as soon as possible.
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1. Problem Summary

There is a buffer overflow vulnerability associated with the crontab
function. When crontab determines the name of the user calling the
crontab function, it stores this name in a 20 byte buffer using the
strcpy() function, which does no bounds checking. The command
"useradd" accepts more than 20 characters. Therefore, a username
greater than 20 characters will crash a system when passed to the
crontab function.

2. Impact

It is possible for a local user to gain elevated privileges.

3. Solution

Update the packages from our ftp server by running the following command:

rpm -Uvh ftp_path_to_filename

Where ftp_path_to_filename is the following:


ftp://ftp.turbolinux.com/pub/updates/6.0/security/vixie-cron-3.0.1-46.i386.rpm

The source RPM can be downloaded here:


ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/vixie-cron-3.0.1-46.src.rpm

**Note: You must rebuild and install the RPM if you choose to download
and install the SRPM. Simply installing the SRPM alone WILL NOT CLOSE
THE SECURITY HOLE.

Please verify the MD5 checksums of the updates before you install:

MD5 sum Package Name
--------------------------------------------------------------------------------------------
-

c79c05f0044f88812908b17730a308ee vixie-cron-3.0.1-46.i386.rpm
cdfd064650b8839a3d7f3eb18a494165 vixie-cron-3.0.1-46.src.rpm
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These packages are GPG signed by Turbolinux for security. Our key
is available here:

http://www.turbolinux.com/security/tlgpgkey.asc

To verify a package, use the following command:

rpm --checksig name_of_rpm

To examine only the md5sum, use the following command:

md5sum name_of_rpm

**Note: Checking GPG keys requires RPM 3.0 or higher.

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You can find more updates on our ftp server:

ftp://ftp.turbolinux.com/pub/updates/6.0/security/

for TL6.0 Workstation and Server security updates

Our webpage for security announcements:

http://www.turbolinux.com/security

If you want to report vulnerabilities, please contact:

security@turbolinux.com
_______________________________________________________________________________________________
_

Subscribe to the Turbolinux Security Mailing lists:

TL-security - A moderated list for discussing security issues
Turbolinux products.
Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security

TL-security-announce - An announce-only mailing list for security
updates and alerts.

Subscribe at:

http://www.turbolinux.com/mailman/listinfo/tl-security-announce

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