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Gentoo Linux Security Advisory GLSA 200909-19 |
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http://security.gentoo.org/ |
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|
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Severity: Normal |
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Title: Dnsmasq: Multiple vulnerabilities |
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Date: September 20, 2009 |
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Bugs: #282653 |
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ID: 200909-19 |
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|
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Synopsis |
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======== |
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|
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Multiple vulnerabilities in Dnsmasq might result in the remote |
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execution of arbitrary code, or a Denial of Service. |
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|
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Background |
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========== |
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|
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Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP |
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server. It includes support for Trivial FTP (TFTP). |
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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-dns/dnsmasq < 2.5.0 >= 2.5.0 |
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|
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Description |
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=========== |
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|
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Multiple vulnerabilities have been reported in the TFTP functionality |
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included in Dnsmasq: |
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|
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* Pablo Jorge and Alberto Solino discovered a heap-based buffer |
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overflow (CVE-2009-2957). |
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|
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* An anonymous researcher reported a NULL pointer reference |
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(CVE-2009-2958). |
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|
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Impact |
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====== |
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|
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A remote attacker in the local network could exploit these |
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vulnerabilities by sending specially crafted TFTP requests to a machine |
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running Dnsmasq, possibly resulting in the remote execution of |
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arbitrary code with the privileges of the user running the daemon, or a |
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Denial of Service. NOTE: The TFTP server is not enabled by default. |
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|
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Workaround |
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========== |
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|
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You can disable the TFTP server either at buildtime by not enabling the |
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"tftp" USE flag, or at runtime. Make sure "--enable-tftp" is not set in |
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the DNSMASQ_OPTS variable in the /etc/conf.d/dnsmasq file and |
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"enable-tftp" is not set in /etc/dnsmasq.conf, either of which would |
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enable TFTP support if it is compiled in. |
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|
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Resolution |
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========== |
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|
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All Dnsmasq users should upgrade to the latest version: |
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|
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# emerge --sync |
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# emerge --ask --oneshot --verbose =net-dns/dnsmasq-2.5.0 |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2009-2957 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2957 |
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[ 2 ] CVE-2009-2958 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2958 |
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|
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Availability |
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============ |
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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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|
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http://security.gentoo.org/glsa/glsa-200909-19.xml |
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|
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Concerns? |
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========= |
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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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https://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2009 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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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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|
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http://creativecommons.org/licenses/by-sa/2.5 |