Parsing SVCB or HTTPS RR Overflow Panic in Go

Executive Summary

This vulnerability involves a panic in Go's DNS message parsing when an invalid SVCB or HTTPS resource record (RR) is processed. The panic occurs because a parameter value's size exceeds the allocated message buffer during parsing.

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Detection Guidance

Detection requires checking if your Go applications use vulnerable versions of golang.org/x/net before v0.56.0. Inspect Go module dependencies with commands like 'go list -m all' or 'go mod graph' to identify affected packages.

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Impact Analysis

If you use Go's x/net/dns/dnsmessage package to parse DNS messages, an attacker could trigger a denial-of-service (DoS) by sending maliciously crafted SVCB or HTTPS records. This could crash applications relying on this package.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a denial-of-service issue in Go's DNS message parsing that causes a panic, which could disrupt services but does not involve data breaches or unauthorized access.

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Mitigation Strategies

Upgrade golang.org/x/net to v0.56.0 or later. If using Go modules, run 'go get golang.org/x/net@latest' and update dependencies. Rebuild and redeploy applications after updating.

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