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CVE-2010-3611: DHCP: Server Crash with Empty Link-Address Field
Author: Cathy Almond Reference Number: AA-00965 Views: 3546 Created: 2013-05-29 14:38 Last Updated: 2013-05-30 17:24 0 Rating/ Voters

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.

Posting date: 
02 Nov 2010
Program Impacted: 
ISC DHCP
Versions affected: 
4.0 through 4.2
Severity: 
High
Exploitable: 
Remotely

Description:

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)

Workarounds:

None.

Active exploits:

None known at this time.

Solution: 

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

Related Documents:

If you'd like more information on our Forum or product support please visit www.isc.org/support.

Do you still have questions?  Questions regarding this advisory should go to security-officer@isc.org

Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected.

ISC Security Vulnerability Disclosure Policy:  Details of our current security advisory policy and practice can be found here: https://www.isc.org/security-vulnerability-disclosure-policy

This Knowledge Base article https://kb.isc.org/article/AA-00965 is the complete and official security advisory document.

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