High CPU Load in DNS Message Parsing Code Affects BIND 9 Versions

CVE-2023-4408

7.5HIGH

Key Information

Vendor
Isc
Status
Bind 9
Vendor
CVE Published:
13 February 2024

Summary

The DNS message parsing code in named includes a section whose computational complexity is overly high. It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive CPU load on the affected named instance by exploiting this flaw. This issue affects both authoritative servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.

Affected Version(s)

BIND 9 9.0.0 <= 9.16.45

BIND 9 9.18.0 <= 9.18.21

BIND 9 9.19.0 <= 9.19.19

References

https://kb.isc.org/docs/cve-2023-4408
vendor-advisory
http://www.openwall.com/lists/oss-security/2024/02/13/1
https://lists.fedoraproject.org/archives/list/package-ann...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Collectors

NVD DatabaseMitre Database

Credit

ISC would like to thank Shoham Danino from Reichman University, Anat Bremler-Barr from Tel-Aviv University, Yehuda Afek from Tel-Aviv University, and Yuval Shavitt from Tel-Aviv University for bringing this vulnerability to our attention.
.