IPv6 FlowSpec Validation Bypass in BIRD Daemon
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| nic | BIRD | unknown |
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| Nic | Bird |
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Vendor Solution
Apply upstream commit 7cf75587b6f38b87849fe192bf5dfd124b7702bc or a verified branch-specific backport. The fix requires the original IPv6 destination-prefix component to have offset zero before it can pass FlowSpec validation. The first fixed release has not yet been verified.
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.308% probability within 30 days)
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| Metrics |
ssvc
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| Title | IPv6 FlowSpec Validation Bypass in BIRD Daemon |
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| Description | An IPv6 FlowSpec validation bypass in the CZ.NIC BIRD Internet Routing Daemon allows an established BGP peer to inject FlowSpec rules matching destinations outside the address space authorized by the unicast-route validation procedure. With validation enabled on the receiving flow6 channel, BIRD fails to reject a destination prefix component with a nonzero offset, contrary to RFC 8956 section 5. It validates a reconstructed prefix with zero-filled skipped bits, although the original FlowSpec component can match a broader set of IPv6 addresses. Given a suitable unicast route from the peer, the rule can pass validation and, where export policy permits, be propagated to downstream peers. Downstream enforcement may cause unauthorized traffic filtering or redirection. | |
| First Time appeared |
Nic
Nic bird |
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| Weaknesses | CWE-1284 | |
| CPEs | cpe:2.3:a:nic:bird:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Nic
Nic bird |
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| References |
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| Metrics |
cvssV4_0
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