CVE-2021-27862

Summary

Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length and Ethernet to Wifi frame conversion (and optionally VLAN0 headers).

Affected Software

Weaknesses

• CWE-130: CWE-130 Improper Handling of Length Parameter
• CWE-290: CWE-290: Authentication Bypass by Spoofing

ADP Enrichment

CVE Program Container

Additional References

• https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/
• https://standards.ieee.org/ieee/802.2/1048/
• https://kb.cert.org/vuls/id/855201
• https://blog.champtar.fr/VLAN0_LLC_SNAP/
• https://www.kb.cert.org/vuls/id/855201

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/
• https://standards.ieee.org/ieee/802.2/1048/
• https://kb.cert.org/vuls/id/855201
• https://blog.champtar.fr/VLAN0_LLC_SNAP/

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