Technical Description

A vulnerability has been identified in HP TCP/IP Services for OpenVMS, which could be exploited by remote attackers to poison a vulnerable DNS cache. This issue is caused due to the DNS server not sufficiently randomising DNS transaction IDs and UDP source ports in the DNS queries that they produce, which may allow an attacker to more easily forge DNS answers that can poison DNS caches.

Affected Products

HP Alpha running TCP/IP Services for OpenVMS version 5.4 ECO 7
HP Integrity and HP Alpha running TCP/IP Services for OpenVMS version 5.5 ECO 3
HP Integrity and HP Alpha running TCP/IP Services for OpenVMS version 5.6 ECO 2

Solution

Apply patch for TCP/IP Services for OpenVMS version 5.4 ECO 7, version 5.5 ECO 3 and version 5.6 ECO 2 :
ftp://ftp.hp.com/pub/openvms/network/TCPIP_BIND_SERVER.ZIPEXE_ALPHA

Apply patch for TCP/IP Services for OpenVMS version 5.5 ECO 3 and version 5.6 ECO 2 :
ftp://ftp.hp.com/pub/openvms/network/TCPIP_BIND_SERVER.ZIPEXE_I64

Or upgrade to HP OpenVMS TCP/IP Services version 5.6 ECO 3.

References

http://www.vupen.com/english/advisories/2008/2383
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01523520

Credits

Vulnerability reported by Dan Kaminsky (IOActive).

ChangeLog

2008-08-15 : Initial release

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