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Gentoo Linux Security Advisory GLSA 200610-15 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: Asterisk: Multiple vulnerabilities |
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Date: October 30, 2006 |
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Bugs: #144941, #151881 |
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ID: 200610-15 |
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Synopsis |
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======== |
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|
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Asterisk is vulnerable to the remote execution of arbitrary code or a |
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Denial of Service. |
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Background |
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========== |
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|
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Asterisk is an open source implementation of a telephone private branch |
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exchange (PBX). |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-misc/asterisk < 1.2.13 >= 1.2.13 |
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|
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Description |
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=========== |
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|
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Asterisk contains buffer overflows in channels/chan_mgcp.c from the |
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MGCP driver and in channels/chan_skinny.c from the Skinny channel |
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driver for Cisco SCCP phones. It also dangerously handles |
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client-controlled variables to determine filenames in the Record() |
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function. Finally, the SIP channel driver in channels/chan_sip.c could |
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use more resources than necessary under unspecified circumstances. |
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|
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Impact |
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====== |
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|
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A remote attacker could execute arbitrary code by sending a crafted |
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audit endpoint (AUEP) response, by sending an overly large Skinny |
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packet even before authentication, or by making use of format strings |
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specifiers through the client-controlled variables. An attacker could |
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also cause a Denial of Service by resource consumption through the SIP |
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channel driver. |
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|
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Workaround |
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========== |
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There is no known workaround for the format strings vulnerability at |
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this time. You can comment the lines in /etc/asterisk/mgcp.conf, |
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/etc/asterisk/skinny.conf and /etc/asterisk/sip.conf to deactivate the |
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three vulnerable channel drivers. Please note that the MGCP channel |
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driver is disabled by default. |
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|
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Resolution |
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========== |
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All Asterisk users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-misc/asterisk-1.2.13" |
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|
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References |
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========== |
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[ 1 ] CVE-2006-4345 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4345 |
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[ 2 ] CVE-2006-4346 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4346 |
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[ 3 ] CVE-2006-5444 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5444 |
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[ 4 ] CVE-2006-5445 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5445 |
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|
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-200610-15.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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Copyright 2006 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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http://creativecommons.org/licenses/by-sa/2.5 |
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