the server receives a DHCPv6 packet containing one or more
Relay-Forward messages, and none of them supply an address in the
Relay-Forward link-address field, then the server will crash. This
can be used as a single packet crash attack vector.
Posting date: 02 Nov 2010
4.0 through 4.2
If the server receives a DHCPv6 packet containing
one or more Relay-Forward messages, and none of them supply an address
in the Relay-Forward link-address field, then the server will crash.
This can be used as a single packet crash attack vector.
Impact and Risk Assessment:
This can be used as a single packet crash attack vector if the server was explicitly configured to serve DHCPv6.
CVSS Score: 4.2
(for more on CVSS scores and to calculate your environment's specific risk, please visit: CVSS Calculator)
None known at this time.
Upgrade DHCP to 4.0.2, 4.1.2, or 4.2.0-P1.
Acknowledgements: John Gibbins, for finding issue and testing patch.
Document Revision History:
Added acknowledgment to John Gibbins
Changed date to Nov 2nd
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Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected.
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This Knowledge Base article https://kb.isc.org/article/AA-00965 is the complete and official security advisory document.
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