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Bug #8750

closed

DNS Rebinding check fails to block IPv6 representation of IPv4 addresses in Unbound

Added by Anonymous over 6 years ago. Updated over 6 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
Jim Pingle
Category:
DNS Resolver
Target version:
2.4.4
Start date:
08/04/2018
Due date:
% Done:

100%

Estimated time:
Plus Target Version:
Release Notes:
Affected Version:
All
Affected Architecture:
All

Description

Not sure if this also affects DNSMasq.

If DNS Rebinding check is not disabled in Settings > Advanced, and a DNS server returns an IPv6 representation of an RFC 1918 IPv4 address for a hostname lookup, Unbound fails to block the result, allowing the resolution to complete successfully.

The following options should be added to the unbound.conf file to block the IPv6 representations of the RFC 1918 and APIPA address ranges when DNS Rebinding check is not disabled:

private-address: ::ffff:a00:0/104
private-address: ::ffff:a9fe:0/112
private-address: ::ffff:ac10:0/108
private-address: ::ffff:c0a8:0/112

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