dhcpcd: Denial of Service vulnerability

1. Gentoo Linux Security Advisory

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

Synopsis

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

2. Impact Information

Background

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.

Description

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.

Impact

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

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

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

CAN-2005-1848

Updated July 15, 2005

Summary: This is a Gentoo Linux Security Advisory

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