6513814 2001-05-17 13:15 -0700 /111 rader/ TurboLinux Security Team <security@www.turbolinux.com>
Bilagans filnamn: "vixie-cron.adv"
Importerad: 2001-05-18 10:55 av Brevbäraren
Extern mottagare: bugtraq@securityfocus.com
Mottagare: Bugtraq (import) <17081>
Bilaga (text/plain) till text 6513805
Ärende: Bilaga (vixie-cron.adv) till: Turbolinux Security Advisories
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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 versions: TL Server 6.5,
TL 6.1 WorkStation,
All TurboLinux versions
6.0.5 and earlier
TurboLinux Advisory ID#: TLSA2001012
Credits: Vulnerability first discovered by
flatline<achter05@ie.hva.nl> References:
http://marc.theaimsgroup.com/?l=bugtraq&m=98200814418344&w=2
_____________________________________________________________________________________________
A security hole has been discovered in the package vixie-cron.
Please update the packages in your installation as soon as possible.
_____________________________________________________________________________________________
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
_____________________________________________________________________________________________
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:
rpm --checksig --nogpg name_of_rpm
**Note: Checking GPG keys requires RPM 3.0 or higher.
________________________________________________________________________________________________
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
(6513814) /TurboLinux Security Team <security@www.turbolinux.com>/(Ombruten)