Dns: Insufficient Bailiwick Validation for NS Records#16877
Merged
Conversation
Motivation: Netty's `DnsResolveContext` insufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like `.co.uk`). Modifications: - Add correct Bailiwick checks when caching NS. - Adjust tests Result: No more risk of cache poising
Contributor
|
Auto-port PR for 5.0: #16899 |
chrisvest
pushed a commit
that referenced
this pull request
Jun 4, 2026
…16899) Auto-port of #16877 to 5.0 Cherry-picked commit: 6f19adf --- Motivation: Netty's `DnsResolveContext` insufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like `.co.uk`). Modifications: - Add correct Bailiwick checks when caching NS. - Adjust tests Result: No more risk of cache poising Co-authored-by: Norman Maurer <norman_maurer@apple.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Motivation:
Netty's
DnsResolveContextinsufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like.co.uk).Modifications:
Result:
No more risk of cache poising