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List: dhcp-announce
Subject: ISC DHCP 4.1.2 is now available!
From: Larissa Shapiro <larissas () isc ! org>
Date: 2010-11-02 23:22:52
Message-ID: 4CD09D4C.7000404 () isc ! org
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ISC DHCP 4.1.2 is now available for download.
This is a maintenance release of ISC DHCP 4.1, which fixes many bugs
including a security related bug. The security advisory is included below.
A list of the changes in this release has been appended to the end
of this message. For a complete list of changes from any previous
release, please consult the RELNOTES file within the source
distribution, or on our website:
http://www.isc.org/software/dhcp
This release, and its OpenPGP-signatures are available now from:
ftp://ftp.isc.org/isc/dhcp/dhcp-4.1.2.tar.gz
ftp://ftp.isc.org/isc/dhcp/dhcp-4.1.2.tar.gz.sha512.asc
ftp://ftp.isc.org/isc/dhcp/dhcp-4.1.2.tar.gz.sha256.asc
ftp://ftp.isc.org/isc/dhcp/dhcp-4.1.2.tar.gz.sha1.asc
ISC's Release Signing Key can be obtained at:
http://www.isc.org/about/openpgp/
Changes since 4.1.2rc1
! Handle a relay forward message with an unspecified address in the
link address field. Previously such a message would cause the
server to crash. Thanks to a report from John Gibbons. [ISC-Bugs
#21992] CERT: VU#102047 CVE: CVE-2010-3611
Changes since 4.1.2b1
- - Update the code to parse dhcpv6 lease files to accept a semi-colon at
the end of the max-life and preferred-life clauses. In order to be
backwards compatible with older lease files not finding a semi-colon
is also accepted. [ISC-Bugs #22303].
Changes since 4.1.1
- - Cleaned up some compiler warnings
- - Prohibit including lease time information in a response to a DHCP
INFORM Bug ticket 21092.
! Accept a client id of length 0 while hashing. Previously the server
would exit if it attempted to hash a zero length client id, providing
attackers with a simple denial of service attack. Bug ticket 21253.
CERT: VU#541921 - CVE: CVE-2010-2156
- - A bug was fixed that could cause the DHCPv6 server to advertise/assign
a previously allocated (active) lease to a client that has changed
subnets, despite being on different shared networks. Dynamic prefixes
specifically allocated in shared networks also now are not offered if
the client has moved. [ISC-Bugs #21152]
- - Add declaration for variable in debug code in alloc.c. [ISC-Bugs
#21472]
- - Documentation cleanup covering multiple tickets
[ISC-Bugs #20265] [ISC-Bugs #20259] [ISC-Bugs #19536] minor cleanup
[ISC-Bugs #20263] add text describing some default values
[ISC-Bugs #20193] single quotes at the start of a line indicate a control
line to nroff, escape them if we actually want a quote.
[ISC-Bugs #18916] sync the pointer to web pages amongst the different docs
[ISC-Bugs #20107] clarify description of ia-pd and ia-prefix.
[ISC-Bugs #20245] clarify editing the failover state in a lease file
to put a server into the PARTNER-DOWN state.
- - 'get-host-names true;' now also works even if 'use-host-decl-names
true;' was also configured. The nature of this repair also fixes
another error; the host-name supplied by a client is no longer
overridden by a reverse lookup of the lease address. Thanks to a patch
from Wilco Baan Hofman supplied to us by the Debian package maintenance
team. [ISC-Bugs #21691] {Debian Bug#509445}
- - The .TH tag for the dhcp-options manpage was typo repaired
thanks to a report from jidanni and the Debian package maintenance
team. [ISC-Bugs #21676] {Debian Bug#563613}
- - More documentation changes - primarily to put the options in the
dhclient and dhcpd man pages into the standard form. Thanks in part to
a patch from David Cantrell at Red Hat. [ISC-Bugs #20264] and parts of
[ISC-Bugs #17744] dhclient.8 changes
- - Minor compilation errors - type mismatches, extra semi-colons after
macros [ISC-Bugs #20884] [ISC-Bugs #20953] [ISC-Bugs #20955]
- - Add code to clear the pointer to an object in an OMAPI handle when the
object is freed due to a dereference. [ISC-Bugs #21306]
- - Fixed a bug that leaks host record references onto lease structures,
causing the server to apply configuration intended for one host to any
other innocent clients that come along later. [ISC-Bugs #22018]
- - Minor code fixes
[ISC-Bugs #19566] When trying to find the zone for a name for ddns
allow the name to be at the apex of the zone.
[ISC-Bugs #19617] Restrict length of interface name read from command
line in dhcpd - based on a patch from David Cantrell at Red Hat.
[ISC-Bugs #20039] Correct some error messages in dhcpd.c
[ISC-Bugs #20070] Better range check on values when creating a DHCID.
[ISC-Bugs #20198] Avoid writing past the end of the field when adding
overly long file or server names to a packet and add a log message
if the configuration supplied overly long names for these fields.
Thanks to Martin Pala.
[ISC-Bugs #21497] Add a little more randomness to rng seed in client
thanks to a patch from Jeremiah Jinno.
- - Correct error handling in DLPI [ISC-Bugs #20378]
- - Remove __sun__ and __hpux__ typedefs in osdep.h as they are now being
checked in configure. [ISC-Bugs #20443]
- - Modify how the cmsg header is allocated the v6 send and received
routines
to compile on more compilers. [ISC-Bugs #20524]
- - When parsing a domain name free the memory for the name after we are
done with it. [ISC-Bugs #20824]
- - Add an elapsed time option to the release message and refactor the
code to move most of the common code to a single routine.
[ISC-Bugs #21171].
- - Parse date strings more properly - the code now handles semi-colons in
date strings correctly. Thanks to a patch from Jiri Popelka at Red Hat.
[ISC-Bugs #21501, #20598]
- - Fixes to lease input and output.
[ISC-Bugs #20418] - Some systems don't support the "%s" argument to
strftime, paste together the same string using mktime instead.
[ISC-Bugs #19596] - When parsing iaid values accept printable
characters.
[ISC-Bugs #21585] - Always print time values in omshell as hex
instead of ascii if the values happen to be printable characters.
- - Minor changes for scripts, configure.ac and Makefiles
[ISC-Bugs #19147] Use domain-search instead of domain-name in manual
and example conf file. Thanks to a patch from David Cantrell at Red Hat.
[ISC-Bugs #19761] Restore address when doing a rebind in DHCPv6
[ISC-Bugs #19945] Properly close the quote on some arguments.
[ISC-Bugs #20952] Add 64 bit types to configure.ac
[ISC-Bugs #21308] Add "PATH=" to CLIENT_PATH envrionment variable
! Handle pipe failures more gracefully. Some OSes pass a SIGPIPE
signal to a process and will kill the process if the signal isn't
caught. This patch adds code to turn off the SIGPIPE signal via
a setsockopt() call and to ignore the SIGPIPE signal in case the
OS doesn't support the necessary setsockopt() option. This problem
was found during internal testing when the two servers in a failover
pair were repeatedly unable to communicate for longer than the
max-response-delay value. Eventually one of the pair attempted a
write() call at just the same time as the other server killed the
connection and caused an uncaught SIGPIPE signal which caused the
OS to kill the server.
This is a minor security issue. It is a security issue as it can
cause a server to stop. It is minor as the attacker would need to
be able to interrupt traffic between the partners in a failover
pair for max-response-delay seconds at will - in which case the
defender has bigger problems than the DHCP server being killed.
Using the NIST CVSS security vulnerability rating system this
issue scored 1.2, meaning it is not a major risk for users.
[ISC-Bugs #22269]
Internet Systems Consortium Security Advisory
DHCP: Server Crash with Empty Link-Address Field
2 Nov 2010
CVE-2010-3611
VU# 102047
Posting date: November 2, 2010
Program Impacted: DHCP
Versions affected: 4.0 through 4.2
Severity: High
Exploitable: remotely
CVSS: 4.2 (for more on CVSS scores and to calculate your environment's
specific risk, please visit: http://nvd.nist.gov/cvss.cfm?calculator)
Description: If the server receives a DHCPv6 packet containing one or
more Relay-Forward messages, and none of them supply an address in the
Relay-Forward link-address field, then the server will crash. This
can be used as a single packet crash attack vector.
Impact and Risk Assessment: This can be used as a single packet crash
attack vector if the server was explicitly configured to serve DHCPv6.
Workarounds: None.
Active exploits: None known.
Solution: Upgrade DHCP to 4.0.3, 4.1.2, or 4.2.0-P1
Acknowledgment: John Gibbons, for finding issue and testing patch.
Revision History: Added acknowledgment to John Gibbins
Changed date to Nov 2nd
For more information please contact dhcp-bugs@isc.org
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