What is CVE-2022-2906?

CVE-2022-2906 is a vulnerability that allows an attacker to gradually deplete available memory in the BIND DNS server, potentially leading to a denial of service (DoS) attack.

How does CVE-2022-2906 affect ISC BIND?

CVE-2022-2906 affects ISC BIND versions 9.18.0 to 9.18.7 and versions 9.19.0 to 9.19.5, potentially causing named crashes due to lack of resources.

What is the severity of CVE-2022-2906?

CVE-2022-2906 has a severity rating of 7.5 (high).

How can an attacker exploit CVE-2022-2906?

An attacker can exploit CVE-2022-2906 by continuously sending specially crafted DNS queries, gradually depleting the available memory in the BIND DNS server.

How can I mitigate the impact of CVE-2022-2906?

To mitigate the impact of CVE-2022-2906, it is recommended to upgrade to a patched version of ISC BIND or apply any available security patches provided by the vendor.

Vulnerability/
CVE-2022-2906

high

7.5

CWE

401

21/9/2022

17/9/2024

CVE-2022-2906: Memory leaks in code handling Diffie-Hellman key exchange via TKEY RRs (OpenSSL 3.0.0+ only)

First published: Wed Sep 21 2022(Updated: )

An attacker can leverage this flaw to gradually erode available memory to the point where named crashes for lack of resources. Upon restart the attacker would have to begin again, but nevertheless there is the potential to deny service.

Credit: security-officer@isc.org

Affected Software	Affected Version	How to fix
ISC BIND	>=9.18.0<9.18.7
ISC BIND	>=9.19.0<9.19.5

Remedy

http://www.openwall.com/lists/oss-security/2022/09/21/3

Remedy

https://kb.isc.org/docs/cve-2022-2906

Remedy

Upgrade to the patched release most closely related to your current version of BIND: BIND 9.18.7 or BIND 9.19.5.

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Reference Links

Frequently Asked Questions

What is CVE-2022-2906?
CVE-2022-2906 is a vulnerability that allows an attacker to gradually deplete available memory in the BIND DNS server, potentially leading to a denial of service (DoS) attack.
How does CVE-2022-2906 affect ISC BIND?
CVE-2022-2906 affects ISC BIND versions 9.18.0 to 9.18.7 and versions 9.19.0 to 9.19.5, potentially causing named crashes due to lack of resources.
What is the severity of CVE-2022-2906?
CVE-2022-2906 has a severity rating of 7.5 (high).
How can an attacker exploit CVE-2022-2906?
An attacker can exploit CVE-2022-2906 by continuously sending specially crafted DNS queries, gradually depleting the available memory in the BIND DNS server.
How can I mitigate the impact of CVE-2022-2906?
To mitigate the impact of CVE-2022-2906, it is recommended to upgrade to a patched version of ISC BIND or apply any available security patches provided by the vendor.

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