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Category:   Application (Generic)  >   Avahi Vendors:   avahi.org
(Red Hat Issues Fix) Avahi Multicast DNS Packet Processing Error in AvahiDnsPacket() Lets Remote Users Deny Service
SecurityTracker Alert ID:  1024202
SecurityTracker URL:  http://securitytracker.com/id/1024202
CVE Reference:   CVE-2010-2244   (Links to External Site)
Date:  Jul 14 2010
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 0.6.27
Description:   A vulnerability was reported in Avahi. A remote user can cause denial of service conditions.

A remote user can send a specially crafted multicast DNS packet with an invalid checksum followed by a multicast DNS packet with a valid checksum to trigger an assertion and cause the target service to crash.

The vulnerability resides in the AvahiDnsPacket() function in 'avahi-core/socket.c'.

Ludwig Nussel reported this vulnerability.

Impact:   A remote user can cause denial of service conditions.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0528.html

Vendor URL:  avahi.org/ (Links to External Site)
Cause:   Exception handling error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Jul 14 2010 Avahi Multicast DNS Packet Processing Error in AvahiDnsPacket() Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2010:0528-01] Moderate: avahi security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: avahi security update
Advisory ID:       RHSA-2010:0528-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0528.html
Issue date:        2010-07-13
CVE Names:         CVE-2009-0758 CVE-2010-2244 
=====================================================================

1. Summary:

Updated avahi packages that fix two security issues are now available for
Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

Avahi is an implementation of the DNS Service Discovery and Multicast DNS
specifications for Zero Configuration Networking. It facilitates service
discovery on a local network. Avahi and Avahi-aware applications allow you
to plug your computer into a network and, with no configuration, view other
people to chat with, view printers to print to, and find shared files on
other computers.

A flaw was found in the way the Avahi daemon (avahi-daemon) processed
Multicast DNS (mDNS) packets with corrupted checksums. An attacker on the
local network could use this flaw to cause avahi-daemon on a target system
to exit unexpectedly via specially-crafted mDNS packets. (CVE-2010-2244)

A flaw was found in the way avahi-daemon processed incoming unicast mDNS
messages. If the mDNS reflector were enabled on a system, an attacker on
the local network could send a specially-crafted unicast mDNS message to
that system, resulting in its avahi-daemon flooding the network with a
multicast packet storm, and consuming a large amount of CPU. Note: The mDNS
reflector is disabled by default. (CVE-2009-0758)

All users are advised to upgrade to these updated packages, which contain
backported patches to correct these issues. After installing the update,
avahi-daemon will be restarted automatically.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

488314 - CVE-2009-0758 avahi: remote DoS via legacy unicast mDNS queries
607293 - CVE-2010-2244 avahi: assertion failure after receiving a packet with corrupted checksum

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/avahi-0.6.16-9.el5_5.src.rpm

i386:
avahi-0.6.16-9.el5_5.i386.rpm
avahi-compat-howl-0.6.16-9.el5_5.i386.rpm
avahi-compat-howl-devel-0.6.16-9.el5_5.i386.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.i386.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.i386.rpm
avahi-debuginfo-0.6.16-9.el5_5.i386.rpm
avahi-devel-0.6.16-9.el5_5.i386.rpm
avahi-glib-0.6.16-9.el5_5.i386.rpm
avahi-glib-devel-0.6.16-9.el5_5.i386.rpm
avahi-qt3-0.6.16-9.el5_5.i386.rpm
avahi-qt3-devel-0.6.16-9.el5_5.i386.rpm
avahi-tools-0.6.16-9.el5_5.i386.rpm

x86_64:
avahi-0.6.16-9.el5_5.i386.rpm
avahi-0.6.16-9.el5_5.x86_64.rpm
avahi-compat-howl-0.6.16-9.el5_5.i386.rpm
avahi-compat-howl-0.6.16-9.el5_5.x86_64.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.i386.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.x86_64.rpm
avahi-debuginfo-0.6.16-9.el5_5.i386.rpm
avahi-debuginfo-0.6.16-9.el5_5.x86_64.rpm
avahi-glib-0.6.16-9.el5_5.i386.rpm
avahi-glib-0.6.16-9.el5_5.x86_64.rpm
avahi-qt3-0.6.16-9.el5_5.i386.rpm
avahi-qt3-0.6.16-9.el5_5.x86_64.rpm
avahi-tools-0.6.16-9.el5_5.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/avahi-0.6.16-9.el5_5.src.rpm

i386:
avahi-compat-howl-devel-0.6.16-9.el5_5.i386.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.i386.rpm
avahi-debuginfo-0.6.16-9.el5_5.i386.rpm
avahi-devel-0.6.16-9.el5_5.i386.rpm
avahi-glib-devel-0.6.16-9.el5_5.i386.rpm
avahi-qt3-devel-0.6.16-9.el5_5.i386.rpm

x86_64:
avahi-compat-howl-devel-0.6.16-9.el5_5.i386.rpm
avahi-compat-howl-devel-0.6.16-9.el5_5.x86_64.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.i386.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.x86_64.rpm
avahi-debuginfo-0.6.16-9.el5_5.i386.rpm
avahi-debuginfo-0.6.16-9.el5_5.x86_64.rpm
avahi-devel-0.6.16-9.el5_5.i386.rpm
avahi-devel-0.6.16-9.el5_5.x86_64.rpm
avahi-glib-devel-0.6.16-9.el5_5.i386.rpm
avahi-glib-devel-0.6.16-9.el5_5.x86_64.rpm
avahi-qt3-devel-0.6.16-9.el5_5.i386.rpm
avahi-qt3-devel-0.6.16-9.el5_5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/avahi-0.6.16-9.el5_5.src.rpm

i386:
avahi-0.6.16-9.el5_5.i386.rpm
avahi-compat-howl-0.6.16-9.el5_5.i386.rpm
avahi-compat-howl-devel-0.6.16-9.el5_5.i386.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.i386.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.i386.rpm
avahi-debuginfo-0.6.16-9.el5_5.i386.rpm
avahi-devel-0.6.16-9.el5_5.i386.rpm
avahi-glib-0.6.16-9.el5_5.i386.rpm
avahi-glib-devel-0.6.16-9.el5_5.i386.rpm
avahi-qt3-0.6.16-9.el5_5.i386.rpm
avahi-qt3-devel-0.6.16-9.el5_5.i386.rpm
avahi-tools-0.6.16-9.el5_5.i386.rpm

ia64:
avahi-0.6.16-9.el5_5.ia64.rpm
avahi-compat-howl-0.6.16-9.el5_5.ia64.rpm
avahi-compat-howl-devel-0.6.16-9.el5_5.ia64.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.ia64.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.ia64.rpm
avahi-debuginfo-0.6.16-9.el5_5.ia64.rpm
avahi-devel-0.6.16-9.el5_5.ia64.rpm
avahi-glib-0.6.16-9.el5_5.ia64.rpm
avahi-glib-devel-0.6.16-9.el5_5.ia64.rpm
avahi-qt3-0.6.16-9.el5_5.ia64.rpm
avahi-qt3-devel-0.6.16-9.el5_5.ia64.rpm
avahi-tools-0.6.16-9.el5_5.ia64.rpm

ppc:
avahi-0.6.16-9.el5_5.ppc.rpm
avahi-0.6.16-9.el5_5.ppc64.rpm
avahi-compat-howl-0.6.16-9.el5_5.ppc.rpm
avahi-compat-howl-0.6.16-9.el5_5.ppc64.rpm
avahi-compat-howl-devel-0.6.16-9.el5_5.ppc.rpm
avahi-compat-howl-devel-0.6.16-9.el5_5.ppc64.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.ppc.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.ppc64.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.ppc.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.ppc64.rpm
avahi-debuginfo-0.6.16-9.el5_5.ppc.rpm
avahi-debuginfo-0.6.16-9.el5_5.ppc64.rpm
avahi-devel-0.6.16-9.el5_5.ppc.rpm
avahi-devel-0.6.16-9.el5_5.ppc64.rpm
avahi-glib-0.6.16-9.el5_5.ppc.rpm
avahi-glib-0.6.16-9.el5_5.ppc64.rpm
avahi-glib-devel-0.6.16-9.el5_5.ppc.rpm
avahi-glib-devel-0.6.16-9.el5_5.ppc64.rpm
avahi-qt3-0.6.16-9.el5_5.ppc.rpm
avahi-qt3-0.6.16-9.el5_5.ppc64.rpm
avahi-qt3-devel-0.6.16-9.el5_5.ppc.rpm
avahi-qt3-devel-0.6.16-9.el5_5.ppc64.rpm
avahi-tools-0.6.16-9.el5_5.ppc.rpm

s390x:
avahi-0.6.16-9.el5_5.s390.rpm
avahi-0.6.16-9.el5_5.s390x.rpm
avahi-compat-howl-0.6.16-9.el5_5.s390.rpm
avahi-compat-howl-0.6.16-9.el5_5.s390x.rpm
avahi-compat-howl-devel-0.6.16-9.el5_5.s390.rpm
avahi-compat-howl-devel-0.6.16-9.el5_5.s390x.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.s390.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.s390x.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.s390.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.s390x.rpm
avahi-debuginfo-0.6.16-9.el5_5.s390.rpm
avahi-debuginfo-0.6.16-9.el5_5.s390x.rpm
avahi-devel-0.6.16-9.el5_5.s390.rpm
avahi-devel-0.6.16-9.el5_5.s390x.rpm
avahi-glib-0.6.16-9.el5_5.s390.rpm
avahi-glib-0.6.16-9.el5_5.s390x.rpm
avahi-glib-devel-0.6.16-9.el5_5.s390.rpm
avahi-glib-devel-0.6.16-9.el5_5.s390x.rpm
avahi-qt3-0.6.16-9.el5_5.s390.rpm
avahi-qt3-0.6.16-9.el5_5.s390x.rpm
avahi-qt3-devel-0.6.16-9.el5_5.s390.rpm
avahi-qt3-devel-0.6.16-9.el5_5.s390x.rpm
avahi-tools-0.6.16-9.el5_5.s390x.rpm

x86_64:
avahi-0.6.16-9.el5_5.i386.rpm
avahi-0.6.16-9.el5_5.x86_64.rpm
avahi-compat-howl-0.6.16-9.el5_5.i386.rpm
avahi-compat-howl-0.6.16-9.el5_5.x86_64.rpm
avahi-compat-howl-devel-0.6.16-9.el5_5.i386.rpm
avahi-compat-howl-devel-0.6.16-9.el5_5.x86_64.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.i386.rpm
avahi-compat-libdns_sd-0.6.16-9.el5_5.x86_64.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.i386.rpm
avahi-compat-libdns_sd-devel-0.6.16-9.el5_5.x86_64.rpm
avahi-debuginfo-0.6.16-9.el5_5.i386.rpm
avahi-debuginfo-0.6.16-9.el5_5.x86_64.rpm
avahi-devel-0.6.16-9.el5_5.i386.rpm
avahi-devel-0.6.16-9.el5_5.x86_64.rpm
avahi-glib-0.6.16-9.el5_5.i386.rpm
avahi-glib-0.6.16-9.el5_5.x86_64.rpm
avahi-glib-devel-0.6.16-9.el5_5.i386.rpm
avahi-glib-devel-0.6.16-9.el5_5.x86_64.rpm
avahi-qt3-0.6.16-9.el5_5.i386.rpm
avahi-qt3-0.6.16-9.el5_5.x86_64.rpm
avahi-qt3-devel-0.6.16-9.el5_5.i386.rpm
avahi-qt3-devel-0.6.16-9.el5_5.x86_64.rpm
avahi-tools-0.6.16-9.el5_5.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2009-0758.html
https://www.redhat.com/security/data/cve/CVE-2010-2244.html
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2010 Red Hat, Inc.
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