dhcpcd DoS (SSA:2005-255-01)

Posted by Philipp Esselbach on: 09/13/2005 04:26 AM [ Print | 0 comment(s) ]

New dhcpcd packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, and -current to fix a minor security issue. The dhcpcd daemon can be tricked into reading past the end of the DHCP buffer by a malicious DHCP server, which causes the dhcpcd daemon to crash and results in a denial of service. Of course, a malicious DHCP server could simply give you an IP address that wouldn't work, too, such as 127.0.0.1, but since people have been asking about this issue, here's a fix, and that's the extent of the impact. In other words, very little real impact.

Even less detail about this issue may be found in the Common Vulnerabilities and Exposures (CVE) database:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1848

Here are the details from the Slackware 10.1 ChangeLog:
+--------------------------+
patches/packages/dhcpcd-1.3.22pl4-i486-2.tgz: Patched an issue where a
remote attacker can cause dhcpcd to crash.
For more information, see:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1848
(* Security fix *)
+--------------------------+

Where to find the new packages:
+-----------------------------+

Updated package for Slackware 8.1:
ftp://ftp.slackware.com/pub/slackware/slackware-8.1/patches/packages/dhcpcd-1.3.22pl4-i386-2.tgz

Updated package for Slackware 9.0:
ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/dhcpcd-1.3.22pl4-i386-2.tgz

Updated package for Slackware 9.1:
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/dhcpcd-1.3.22pl4-i486-2.tgz

Updated package for Slackware 10.0:
ftp://ftp.slackware.com/pub/slackware/slackware-10.0/patches/packages/dhcpcd-1.3.22pl4-i486-2.tgz

Updated package for Slackware 10.1:
ftp://ftp.slackware.com/pub/slackware/slackware-10.1/patches/packages/dhcpcd-1.3.22pl4-i486-2.tgz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/dhcpcd-1.3.22pl4-i486-2.tgz

MD5 signatures:
+-------------+

Slackware 8.1 package:
44b66bd3cd5c40462487d712d4a71658 dhcpcd-1.3.22pl4-i386-2.tgz

Slackware 9.0 package:
8da58d01be00250353e5b2a170f62cc8 dhcpcd-1.3.22pl4-i386-2.tgz

Slackware 9.1 package:
b6cd305e1958850aef13eb33e5117cc0 dhcpcd-1.3.22pl4-i486-2.tgz

Slackware 10.0 package:
ec17f5bd67d70f5657adf7342a41e167 dhcpcd-1.3.22pl4-i486-2.tgz

Slackware 10.1 package:
38d0418326a302e536e21a05e6bdb01f dhcpcd-1.3.22pl4-i486-2.tgz

Slackware -current package:
4634de215bbdd2e9d2affc673ff38d3a dhcpcd-1.3.22pl4-i486-2.tgz

Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg dhcpcd-1.3.22pl4-i486-2.tgz

+-----+

Slackware Linux Security Team
http://slackware.com/gpg-key
security@slackware.com