CVE-2024-12705
Description
A flaw was found in BIND 9. By flooding a target resolver with HTTP/2 traffic and exploiting this flaw, an attacker could overwhelm the server, causing high CPU and/or memory usage and preventing other clients from establishing DoH connections. This issue could significantly impair the resolver's performance and effectively deny legitimate clients access to the DNS resolution service.
Statement
The bind package shipped by Red Hat by default does not enable DNS-over-HTTPS functionality.
The bind-9.11 version used in Red Hat Enterprise Linux 7 and 8 does not have any DNS-over-HTTP/HTTPS/TLS implementation and is therefore not affected.
The bind-9.16 version used in Red Hat Enterprise Linux 8 and 9 does not have any DNS-over-HTTP/HTTPS/TLS implementation and is therefore not affected by this vulnerability.
Mitigation
If the feature is not needed, disable DNS-over-HTTPS (DoH) in your bind config. Otherwise, we recommend upgrading to a patched version of bind.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Acknowledgements
Red Hat would like to thank Jean-François Billaud for reporting this issue.
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