CVE-2020-8622

Summary

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

Affected Software

VendorProductVersion RangeStatus
ISCBIND99.0.0 < unspecifiedaffected
ISCBIND9unspecified < 9.11.22affected
ISCBIND99.12.0 < unspecifiedaffected
ISCBIND9unspecified < 9.16.6affected
ISCBIND99.17.0 < unspecifiedaffected
ISCBIND9unspecified < 9.17.4affected
ISCBIND99.9.3-S1 < Supported Preview*affected

Weaknesses

  • Attempting to verify a truncated response to a TSIG-signed request leads to an assertion failure. Affects BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition

Workarounds

No workarounds known.

ADP Enrichment

CVE Program Container

Additional References

References