CVE-2011-4868: An Error in DDNS Processing of DHCPv6 Leases Can Cause a Crash in ISC dhcpd
Improper handling of Dynamic DNS information associated with DHCPv6 leases can cause a segmentation fault in ISC DHCP servers using IPv6 and Dynamic DNS, resulting in denial of service to clients.
12 Jan 2012
4.2.2, 4.2.3, 4.2.3-P1
**Description:** Due to improper handling of a DHCPv6 lease
structure, ISC DHCP servers that are serving IPv6 address pools AND using Dynamic DNS can encounter a segmentation fault error while updating lease status under certain conditions. The potential exists for this condition to be intentionally triggered, resulting in effective denial of service to clients expecting service from the affected server. Users of affected versions who use DHCPv6 and Dynamic DNS should upgrade to version 4.2.3-P2.
CVSS Score : 6.1
CVSS Equation :
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**Workarounds:** No known workarounds, please upgrade if you are running an affected version of ISC DHCP and you use Dynamic DNS and IPv6. **Active exploits:** None known at this time.
Solution: Upgrade to ISC DHCP 4.2.3-P2
DHCP 4.2.3-P2 can be downloaded from the following location: http://www.isc.org/software/dhcp
**Document Revision History** :
1.0 05 January 2012 - Phase I notified
1.1 11 January 2012 - Phase II & III notified
1.2 12 January 2012 - Public Release
**Related Document:** This security advisory is a copy of the official document located on our website: [https://www.isc.org/software/dhcp/advisories/cve-2011-4868](https://www.isc.org/software/dhcp/advisories/cve-2011-4868)
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