A vulnerability has been reported in ISC DHCP, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to a NULL pointer dereference error within the handling of the DHCPv6 lease structure when updating Dynamic DNS lease status, which can be exploited to cause a crash by sending specially crafted DHCP packets.
Successful exploitation requires that DHCPv6 and Dynamic DNS are used.
The vulnerability is reported in versions 4.2.2, 4.2.3, and 4.2.3-P1.
Solution: Update to version 4.2.3-P2.
Provided and/or discovered by: Reported by the vendor.
Original Advisory: https://www.isc.org/software/dhcp/advisories/cve-2011-4868
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Subject: ISC DHCP DHCPv6 Dynamic DNS Lease Status Updating Denial of Service Vulnerability
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