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dnsmasq Denial of Service and DNS Cache Poisoning
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Secunia Advisory:
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SA31197
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Release Date:
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2008-07-23
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Last Update:
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2008-07-29
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Popularity:
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2,750 views
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Critical:
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Moderately critical
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Impact:
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Spoofing
DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Dnsmasq 2.x
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| CVE reference: | CVE-2008-1447
CVE-2008-3350
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Description:
Some vulnerabilities have been reported in dnsmasq, which can be exploited by malicious people to cause a DoS (Denial of Service) and poison the DNS cache.
1) A vulnerability is caused due to dnsmasq not sufficiently randomising the DNS transaction ID and the source port number, which can be exploited to poison the DNS cache.
2) An error when an unknown client tries to renew a DHCP lease can be exploited to crash the service.
Note: Additionally, an error within the netlink code and a potential crash when a host without a lease performs a DHCPINFORM have been reported in version 2.43.
Vulnerability #1 is reported in versions prior to 2.43, vulnerability #2 is reported in version 2.43.
Solution:
Update to version 2.45.
Provided and/or discovered by:
1) Dan Kaminsky, IOActive
2) The vendor thanks Carlos Carvalho
Changelog:
2008-07-29: Added CVE reference.
Original Advisory:
dnsmasq release announcements:
http://article.gmane.org/gmane.network.dns.dnsmasq.general/2156
http://article.gmane.org/gmane.network.dns.dnsmasq.general/2189
http://article.gmane.org/gmane.network.dns.dnsmasq.general/2199
Vendor statement regarding DNS cache poisoning:
http://article.gmane.org/gmane.network.dns.dnsmasq.general/2176
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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