Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)
References
| Link | Resource |
|---|---|
| https://standards.ieee.org/ieee/802.2/1048/ | Third Party Advisory |
| https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/ | Third Party Advisory |
| https://standards.ieee.org/ieee/802.1Q/10323/ | Third Party Advisory |
| https://kb.cert.org/vuls/id/855201 | |
| https://blog.champtar.fr/VLAN0_LLC_SNAP/ |
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Information
Published : 2022-09-27 12:15
Updated : 2022-10-12 06:15
NVD link : CVE-2021-27861
Mitre link : CVE-2021-27861
JSON object : View
CWE
CWE-290
Authentication Bypass by Spoofing
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Products Affected
ieee
- ieee_802.2
ietf
- p802.1q