Processing large delegations may severely degrade resolver performance

CVE-2022-2795

5.3MEDIUM

Key Information

Vendor
Isc
Status
Bind9
Vendor
CVE Published:
21 September 2022

Badges

👾 Exploit Exists

Summary

By flooding the target resolver with queries exploiting this flaw an attacker can significantly impair the resolver's performance, effectively denying legitimate clients access to the DNS resolution service.

Affected Version(s)

BIND9 Open Source Branches 9.0 through 9.16 9.0.0 through versions before 9.16.33

BIND9 Open Source Branch 9.18 9.18.0 through versions before 9.18.7

BIND9 Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions up to and including 9.11.37-S1

References

https://kb.isc.org/docs/cve-2022-2795
http://www.openwall.com/lists/oss-security/2022/09/21/3
mailing-list
https://www.debian.org/security/2022/dsa-5235
vendor-advisory

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Collectors

NVD DatabaseMitre Database

Credit

ISC would like to thank Yehuda Afek from Tel-Aviv University and Anat Bremler-Barr & Shani Stajnrod from Reichman University for bringing this vulnerability to our attention.
.