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[ GLSA 200807-08 ] BIND: Cache poisoning
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GLSA
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PostPosted: Fri Jul 11, 2008 6:26 pm    Post subject: [ GLSA 200807-08 ] BIND: Cache poisoning Reply with quote

Gentoo Linux Security Advisory

Title: BIND: Cache poisoning (GLSA 200807-08)
Severity: high
Exploitable: remote
Date: July 11, 2008
Bug(s): #231201
ID: 200807-08

Synopsis

A weakness in the DNS protocol has been reported, which could lead to cache poisoning on recursive resolvers.

Background

ISC BIND is the Internet Systems Consortium implementation of the Domain Name System (DNS) protocol.

Affected Packages

Package: net-dns/bind
Vulnerable: < 9.4.2_p1
Unaffected: >= 9.4.2_p1
Architectures: All supported architectures


Description

Dan Kaminsky of IOActive has reported a weakness in the DNS protocol related to insufficient randomness of DNS transaction IDs and query source ports.

Impact

An attacker could exploit this weakness to poison the cache of a recursive resolver and thus spoof DNS traffic, which could e.g. lead to the redirection of web or mail traffic to malicious sites.

Workaround

There is no known workaround at this time.

Resolution

All BIND users should upgrade to the latest version:
Code:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/bind-9.4.2_p1"
Note: In order to utilize the query port randomization to mitigate the weakness, you need to make sure that your network setup allows the DNS server to use random source ports for query and that you have not set a fixed query port via the "query-source port" directive in the BIND configuration.

References

CVE-2008-1447


Last edited by GLSA on Mon Feb 09, 2009 4:18 am; edited 2 times in total
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