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

Published Sep 21, 2022
·
Updated

A flaw was found in bind. When flooding the target resolver with special queries, an attacker can significantly impair the resolver's performance, effectively denying legitimate clients access to the DNS resolution service.

Other sources

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.

Processing large delegations may severely degrade resolver performance

— Microsoft

Affected Software

49 affected componentsFixes available
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+deb10u91:9.16.44-1~deb11u11:9.18.19-1~deb12u11:9.19.17-1
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
redhat/bind<9.16.33
9.16.33
redhat/bind<9.18.7
9.18.7
redhat/bind<9.19.5
9.19.5
Microsoft cbl2 bind 9.16.33-1
Patch available
Microsoft cbl2 dhcp 4.4.3-2
Patch available
Microsoft cbl2 dhcp 4.4.3.P1-2
Patch available
Microsoft cm1 bind 9.16.33-1
Patch available
ISC BIND=9.9.3-s1
ISC BIND=9.11.5-s3

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/bind to a version that resolves this vulnerability.

    Fixed in 32:9.11.4-26.P2.el7_9.13
  2. Upgrade

    Upgrade redhat/bind9.16 to a version that resolves this vulnerability.

    Fixed in 32:9.16.23-0.14.el8
  3. Upgrade

    Upgrade redhat/bind to a version that resolves this vulnerability.

    Fixed in 32:9.11.36-8.el8
  4. Upgrade

    Upgrade redhat/bind to a version that resolves this vulnerability.

    Fixed in 32:9.16.23-11.el9
  5. Upgrade

    Upgrade debian/bind9 to a version that resolves this vulnerability.

    Fixed in 1:9.11.5.P4+dfsg-5.1+deb10u9Fixed in 1:9.16.44-1~deb11u1Fixed in 1:9.18.19-1~deb12u1Fixed in 1:9.19.17-1
  6. Upgrade

    Upgrade redhat/bind to a version that resolves this vulnerability.

    Fixed in 9.16.33
  7. Upgrade

    Upgrade redhat/bind to a version that resolves this vulnerability.

    Fixed in 9.18.7
  8. Upgrade

    Upgrade redhat/bind to a version that resolves this vulnerability.

    Fixed in 9.19.5
  9. Upgrade

    Upgrade BIND to a version that resolves this vulnerability.

    Fixed in 9.16.33
  10. Upgrade

    Upgrade BIND to a version that resolves this vulnerability.

    Fixed in 9.18.7
  11. Upgrade

    Upgrade BIND to a version that resolves this vulnerability.

    Fixed in 9.19.5
  12. Upgrade

    Upgrade BIND Supported Preview Edition to a version that resolves this vulnerability.

    Fixed in 9.16.33-S1

Event History

Sep 21, 2022
CVE Published
12:00 AM
Data Sourced
via Red Hat·07:36 AM
DescriptionSeverityAffected Software
CVE Published
via MITRE·10:15 AM
Data Sourced
via MITRE·10:15 AM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·11:15 AM
RemedyDescriptionSeverityAffected Software
Sep 24, 2022
Data Sourced
via Microsoft·07:00 AM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·07:00 AM
Affected Software
Updated
via Microsoft·07:00 AM
Affected Software
Updated
via Microsoft·07:00 AM
DescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the vulnerability ID for this flaw?

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

2

What is the severity of CVE-2022-2795?

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

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.

4

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.

5

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.

Company

Resources

Contact

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