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dhcpcd: Denial of Service vulnerability


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200507-16 / dhcpcd
Release Date July 15, 2005
Latest Revision July 15, 2005: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-misc/dhcpcd < 1.3.22_p4-r11 >= 1.3.22_p4-r11 All supported architectures

Related bugreports: #98394


A vulnerability in dhcpcd may cause the dhcpcd daemon to crash.

2.  Impact Information


dhcpcd is a standards compliant DHCP client daemon. It requests an IP address and other information from the DHCP server, automatically configures the network interface, and tries to renew the lease time.


infamous42md discovered that dhcpcd can be tricked to read past the end of the supplied DHCP buffer. As a result, this might lead to a crash of the daemon.


With a malicious DHCP server an attacker could cause a Denial of Service by crashing the DHCP client.

3.  Resolution Information


There is no known workaround at this time.


All dhcpcd users should upgrade to the latest available version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/dhcpcd-1.3.22_p4-r11"

4.  References


Page updated July 15, 2005

Summary: This is a Gentoo Linux Security Advisory

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