medium
5.3
CWE
20 400
Advisory Published
CVE Published
Updated

CVE-2022-2795: Processing large delegations may severely degrade resolver performance

First published: Wed Sep 21 2022(Updated: )

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.

Credit: security-officer@isc.org

Affected SoftwareAffected VersionHow to fix
redhat/bind<32:9.11.4-26.P2.el7_9.13
32:9.11.4-26.P2.el7_9.13
redhat/bind9.16<32:9.16.23-0.14.el8
32:9.16.23-0.14.el8
redhat/bind<32:9.11.36-8.el8
32:9.11.36-8.el8
redhat/bind<32:9.16.23-11.el9
32:9.16.23-11.el9
debian/bind9<=1:9.11.5.P4+dfsg-5.1+deb10u7
1:9.11.5.P4+dfsg-5.1+deb10u9
1:9.16.44-1~deb11u1
1:9.18.19-1~deb12u1
1:9.19.17-1
redhat/bind<9.16.33
9.16.33
redhat/bind<9.18.7
9.18.7
redhat/bind<9.19.5
9.19.5
ISC BIND>=9.0.0<9.16.33
ISC BIND>=9.18.0<9.18.7
ISC BIND>=9.19.0<9.19.5
Isc Bind Supported Preview=9.9.3-s1
ISC BIND=9.9.3-s1
ISC BIND=9.9.12-s1
ISC BIND=9.9.13-s1
ISC BIND=9.10.5-s1
ISC BIND=9.10.7-s1
ISC BIND=9.11.3-s1
Isc Bind Supported Preview=9.11.5-s3
ISC BIND=9.11.5-s3
ISC BIND=9.11.5-s5
ISC BIND=9.11.5-s6
ISC BIND=9.11.6-s1
ISC BIND=9.11.7-s1
ISC BIND=9.11.8-s1
ISC BIND=9.11.12-s1
ISC BIND=9.11.14-s1
ISC BIND=9.11.19-s1
ISC BIND=9.11.21-s1
ISC BIND=9.11.27-s1
ISC BIND=9.11.29-s1
ISC BIND=9.11.35-s1
ISC BIND=9.11.37-s1
ISC BIND=9.16.8-s1
ISC BIND=9.16.11-s1
ISC BIND=9.16.13-s1
ISC BIND=9.16.21-s1
ISC BIND=9.16.32-s1
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Fedoraproject Fedora=35
Fedoraproject Fedora=36
Fedoraproject Fedora=37

Remedy

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

Remedy

https://kb.isc.org/docs/cve-2022-2795

Remedy

Upgrade to the patched release most closely related to your current version of BIND: BIND 9.16.33, BIND 9.18.7, BIND 9.19.5, or for BIND Supported Preview Edition (a special feature preview branch of BIND provided to eligible ISC support customers): BIND 9.16.33-S1.

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the vulnerability ID for this flaw?

    The vulnerability ID for this flaw is CVE-2022-2795.

  • What is the severity of CVE-2022-2795?

    The severity of CVE-2022-2795 is medium with a severity value of 5.3.

  • How does the vulnerability CVE-2022-2795 impact the target resolver?

    The vulnerability CVE-2022-2795 allows an attacker to significantly impair the resolver's performance, effectively denying legitimate clients access to the DNS resolution service.

  • What software versions are affected by CVE-2022-2795?

    The software versions affected by CVE-2022-2795 include bind 9.16.33, bind 9.18.7, bind 9.19.5, and corresponding versions in Red Hat and Debian distributions.

  • Are there any known remedies for CVE-2022-2795?

    Yes, there are known remedies for CVE-2022-2795 which include upgrading to specific versions of bind like 9.16.44-1~deb11u1 or applying patches provided by Red Hat and Debian.

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