Unbound cache poisoning via promiscuous NS RRSets
NLnet Labs Unbound, a validating recursive caching DNS resolver, is vulnerable to cache poisoning and possible domain hijack attacks in versions up to and including 1.24.1 due to incorrect handling of unsolicited or promiscuous NS RRSets included in DNS replies. NS records placed in the authority section can be accepted with sufficient trust and used to update cached delegation information for a zone, even when those records are not legitimately solicited for that response context. An attacker able to inject such NS RRSets, and potentially corresponding address records, into a DNS reply can cause Unbound to replace or augment its cached delegation data for the affected delegation point. The issue is exploitable through forged or spoofed packets and fragmentation-based injection scenarios. Version 1.24.1 introduced a partial fix that scrubs unsolicited NS RRSets and related address records from replies, but additional cases involving YXDOMAIN and non-referral nodata replies required a further fix in 1.24.2. Later content also notes a complementary hardening change in 1.25.1 to disregard unrelated additional-section address records.
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