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Gentoo Linux Security Advisory GLSA 200504-03 |
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http://security.gentoo.org/ |
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Severity: Low |
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Title: Dnsmasq: Poisoning and Denial of Service vulnerabilities |
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Date: April 04, 2005 |
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Bugs: #86718 |
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ID: 200504-03 |
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Synopsis |
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======== |
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|
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Dnsmasq is vulnerable to DNS cache poisoning attacks and a potential |
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Denial of Service from the local network. |
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Background |
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========== |
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|
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Dnsmasq is a lightweight and easily-configurable DNS forwarder and DHCP |
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server. |
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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 < 2.22 >= 2.22 |
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Description |
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=========== |
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|
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Dnsmasq does not properly detect that DNS replies received do not |
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correspond to any DNS query that was sent. Rob Holland of the Gentoo |
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Linux Security Audit team also discovered two off-by-one buffer |
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overflows that could crash DHCP lease files parsing. |
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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 send malicious answers to insert arbitrary DNS |
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data into the Dnsmasq cache. These attacks would in turn help an |
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attacker to perform man-in-the-middle and site impersonation attacks. |
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The buffer overflows might allow an attacker on the local network to |
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crash Dnsmasq upon restart. |
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|
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Workaround |
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========== |
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There is no known workaround at this time. |
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Resolution |
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========== |
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All Dnsmasq users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.22" |
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References |
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========== |
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[ 1 ] Dnsmasq Changelog |
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http://www.thekelleys.org.uk/dnsmasq/CHANGELOG |
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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-200504-03.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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License |
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======= |
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Copyright 2005 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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http://creativecommons.org/licenses/by-sa/2.0 |
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