CVE-2004-0460: DHCP stack buffer overflow vulnerability in handling log lines containing ASCII characters only
| Author: Cathy Almond Reference Number: AA-00961 Views: 4423 Created: 2013-05-29 14:32 Last Updated: 2013-05-30 11:41
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Buffer overflow in the logging capability for the DHCP daemon (DHCPD)
Posting date: 22 Jun 2004
DHCPD syslogs every DHCP packet in transactions
along with several pieces of descriptive information. The client's
DISCOVER and the resulting OFFER, REQUEST, and ACK are all logged as
well as any NAKs. In all of these messages, if the client supplied a
hostname then it is also included in the logged line. If the client
supplies multiple hostname options these options will be concatenated
together. If the hostname and options contain only ASCII characters,
then the string will pass non-ASCII character filters and be temporarily
stored in 1024 byte fixed-length buffers on the stack.
It is possible that if enough hostname options are supplied by the
client, and other text is logged in the same line, then the static
buffer will be overflown, writing over the stack. If non-ASCII or
non-printable characters are supplied, then there are other checks and
filters that will prevent this buffer overflow from occuring.
Only ISC DHCP 3.0.1rc12 and ISC DHCP 3.0.1rc13 are believed to be
vulnerable for all operating systems and configurations. All versions of
ISC DCHP 3, including all snapshots, betas, and release candidates,
contain the flawed code. However, since these versions discard of all
but the last hostname option provided by the client, it is not believed
that these versions are exploitable.
None known at this time.
Upgrade to a released version of ISC DHCPD
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