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SSRF: block NAT64 and 6to4 IPv6 encapsulation ranges #2987

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SSRF: block NAT64 and 6to4 IPv6 encapsulation ranges #2987

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4 changes: 3 additions & 1 deletion app/models/ssrf_protection.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,9 @@ module SsrfProtection
DISALLOWED_IP_RANGES = [
IPAddr.new("0.0.0.0/8"), # "This" network (RFC1700)
IPAddr.new("100.64.0.0/10"), # Carrier-grade NAT (RFC6598)
IPAddr.new("198.18.0.0/15") # Benchmark testing (RFC2544)
IPAddr.new("198.18.0.0/15"), # Benchmark testing (RFC2544)
IPAddr.new("64:ff9b::/96"), # NAT64 well-known prefix (RFC6052)
IPAddr.new("2002::/16") # 6to4 (RFC3056)
].freeze

def resolve_public_ip(hostname)
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14 changes: 14 additions & 0 deletions test/models/ssrf_protection_test.rb
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Expand Up @@ -82,4 +82,18 @@ class SsrfProtectionTest < ActiveSupport::TestCase
stub_dns_resolution("::93.184.216.34")
assert_nil SsrfProtection.resolve_public_ip("compat-public.example.com")
end

# IPv6 encapsulation ranges (SSRF bypass prevention)

test "blocks NAT64 well-known prefix addresses" do
assert SsrfProtection.blocked_address?("64:ff9b::a00:1")
end

test "blocks 6to4 addresses" do
assert SsrfProtection.blocked_address?("2002::1")
end

test "allows public addresses through blocked_address?" do
assert_not SsrfProtection.blocked_address?("93.184.216.34")
end
end