Gentoo Archives: gentoo-announce

From: Robert Buchholz <rbu@g.o>
To: gentoo-announce@l.g.o
Cc: bugtraq@×××××××××××××.com, full-disclosure@××××××××××××××.uk, security-alerts@×××××××××××××.com
Subject: [gentoo-announce] [ GLSA 200904-10 ] Avahi: Denial of Service
Date: Wed, 08 Apr 2009 22:56:19
Message-Id: 200904090048.09963.rbu@gentoo.org
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2 Gentoo Linux Security Advisory GLSA 200904-10
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4 http://security.gentoo.org/
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6
7 Severity: Normal
8 Title: Avahi: Denial of Service
9 Date: April 08, 2009
10 Bugs: #260971
11 ID: 200904-10
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14
15 Synopsis
16 ========
17
18 An error in Avahi might lead to a Denial of Service via network and CPU
19 consumption.
20
21 Background
22 ==========
23
24 Avahi is a system that facilitates service discovery on a local
25 network.
26
27 Affected packages
28 =================
29
30 -------------------------------------------------------------------
31 Package / Vulnerable / Unaffected
32 -------------------------------------------------------------------
33 1 net-dns/avahi < 0.6.24-r2 >= 0.6.24-r2
34
35 Description
36 ===========
37
38 Rob Leslie reported that the
39 originates_from_local_legacy_unicast_socket() function in
40 avahi-core/server.c does not account for the network byte order of a
41 port number when processing incoming multicast packets, leading to a
42 multicast packet storm.
43
44 Impact
45 ======
46
47 A remote attacker could send specially crafted legacy unicast mDNS
48 query packets to the Avahi daemon, resulting in a Denial of Service due
49 to network bandwidth and CPU consumption.
50
51 Workaround
52 ==========
53
54 There is no known workaround at this time.
55
56 Resolution
57 ==========
58
59 All Avahi users should upgrade to the latest version:
60
61 # emerge --sync
62 # emerge --ask --oneshot --verbose ">=net-dns/avahi-0.6.24-r2"
63
64 References
65 ==========
66
67 [ 1 ] CVE-2009-0758
68 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0758
69
70 Availability
71 ============
72
73 This GLSA and any updates to it are available for viewing at
74 the Gentoo Security Website:
75
76 http://security.gentoo.org/glsa/glsa-200904-10.xml
77
78 Concerns?
79 =========
80
81 Security is a primary focus of Gentoo Linux and ensuring the
82 confidentiality and security of our users machines is of utmost
83 importance to us. Any security concerns should be addressed to
84 security@g.o or alternatively, you may file a bug at
85 http://bugs.gentoo.org.
86
87 License
88 =======
89
90 Copyright 2009 Gentoo Foundation, Inc; referenced text
91 belongs to its owner(s).
92
93 The contents of this document are licensed under the
94 Creative Commons - Attribution / Share Alike license.
95
96 http://creativecommons.org/licenses/by-sa/2.5

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