Date: Fri, 28 Jul 2000 16:06:34 -0700 (PDT)
From: Joe Little jlittle@turbolinux.com
To: tl-security-announce@turbolinux.com
Subject: [TL-Security-Announce] dhcp TLSA2000015-1
TurboLinux Security Announcement
Package: dhcp-2.0 and earlier
Date: Wednesday July 19 17:00 PDT 2000
Affected TurboLinux versions: 6.0.5 and earlier
Vulnerability Type: remote root exploit
TurboLinux Advisory ID#: TLSA2000015-1
Credits: OpenBSD team / mellon@NOMINUM.COM
A security hole was discovered in the package mentioned above.
Please update the package in your installation as soon as possible
or disable the service.
1. Problem Summary
Current and previous version of the DHCP client is vulnerable to
malicious DHCP servers. The client can execute arbitrary commands
given to it in responses from a DHCP server.
2. Impact
A maliciously placed DHCP can answer to any local DHCP client,
thus providing an avenue to remotely exploit root privileges on the
client.
3. Solution
Please upgrade both the client and server packages to match the
new revision
Update the packages from our ftp server by running the following
command:
rpm -Fv ftp_path_to_filename
Where ftp_path_to_filename is the following:
ftp://ftp.turbolinux.com/pub/updates/6.0/security/dhcp-2.0pl3-4.i386.rpm
ftp://ftp.turbolinux.com/pub/updates/6.0/security/dhcp-client-2.0pl3-4.i386.rpm
The source RPM can be downloaded here:
ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/dhcp-2.0pl3-4.i386.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 checksum of the update before you
install:
MD5 sum Package Name
d6b80f8168a2ea8ec13f25a28d14943e dhcp-2.0pl3-4.i386.rpm 66085982778f6820a118abff4e336b2e dhcp-client-2.0pl3-4.i386.rpm 044a8281b6ebf8755aebf38e4a077087 dhcp-2.0pl3-4.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
ftp://ftp.turbolinux.com/pub/updates/4.0/security/
for TL4.0 Workstation
and Server security updates
Our webpage for security announcements:
http://www.turbolinux.com/security
If you want to report vulnerabilities, please contact:
Subscribe to the TurboLinux Security Mailing lists:
TL-security – A moderated list for discussing security issues in
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http://www.turbolinux.com/mailman/listinfo/tl-security
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