CVE-2023-4236: named may terminate unexpectedly under high DNS-over-TLS query load
First published: Wed Sep 20 2023(Updated: )
A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load. This issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.
Credit: security-officer@isc.org security-officer@isc.org security-officer@isc.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/bind9 | <=1:9.18.16-1~deb12u1<=1:9.18.16-1 | 1:9.18.19-1~deb12u1 1:9.19.17-1 |
| ISC BIND | >=9.18.0<9.18.18 | |
| ISC BIND | =9.18.11-s1 | |
| ISC BIND | =9.18.18-s1 | |
| debian/bind9 | 1:9.11.5.P4+dfsg-5.1+deb10u7 1:9.11.5.P4+dfsg-5.1+deb10u10 1:9.16.44-1~deb11u1 1:9.16.48-1 1:9.18.19-1~deb12u1 1:9.18.24-1 1:9.19.21-1 | |
| Fedoraproject Fedora | =37 | |
| Fedoraproject Fedora | =38 | |
| Fedoraproject Fedora | =39 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| All of | ||
| Netapp H300s Firmware | ||
| Netapp H300s | ||
| All of | ||
| Netapp H500s Firmware | ||
| Netapp H500s | ||
| All of | ||
| Netapp H700s Firmware | ||
| Netapp H700s | ||
| All of | ||
| Netapp H410s Firmware | ||
| Netapp H410s | ||
| All of | ||
| Netapp H410c Firmware | ||
| Netapp H410c | ||
| ubuntu/bind9 | <1:9.18.12-0ubuntu0.22.04.3 | 1:9.18.12-0ubuntu0.22.04.3 |
| ubuntu/bind9 | <1:9.18.12-1ubuntu1.2 | 1:9.18.12-1ubuntu1.2 |
| ubuntu/bind9 | <1:9.18.18-0ubuntu2 | 1:9.18.18-0ubuntu2 |
| ubuntu/bind9 | <1:9.18.18-0ubuntu2 | 1:9.18.18-0ubuntu2 |
| ubuntu/bind9 | <9.18.19 | 9.18.19 |
Remedy
Upgrade to the patched release most closely related to your current version of BIND 9: 9.18.19 or 9.18.19-S1.
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Reference Links
- https://security-tracker.debian.org/tracker/CVE-2023-4236
- https://www.cve.org/CVERecord?id=CVE-2023-4236
- https://kb.isc.org/docs/cve-2023-4236
- https://security-tracker.debian.org/tracker/CVE-2023-3341
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1052417
- http://www.openwall.com/lists/oss-security/2023/09/20/2
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IPJLLTJCSDJJII7IIZPLTBQNWP7MZH7F/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U35OARLQCPMVCBBPHWBXY5M6XJLD2TZ5/
- https://security.netapp.com/advisory/ntap-20231013-0004/
- https://www.debian.org/security/2023/dsa-5504
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSK5V4W4OHPM3JTJGWAQD6CZW7SFD75B/
- https://launchpad.net/bugs/cve/CVE-2023-4236
- https://gitlab.isc.org/isc-projects/bind9/-/commit/18efa454a98759bf4f3ca806d9a6ef881ff9648d
- https://ubuntu.com/security/notices/USN-6390-1
- https://nvd.nist.gov/vuln/detail/CVE-2023-4236
- https://ubuntu.com/security/CVE-2023-4236
Frequently Asked Questions
What is CVE-2023-4236?
CVE-2023-4236 is a vulnerability in BIND 9, the DNS server software developed by ISC.
How does CVE-2023-4236 affect BIND 9?
CVE-2023-4236 affects BIND 9 versions 9.18.0 through 9.18.18.
What is the severity of CVE-2023-4236?
The severity of CVE-2023-4236 is rated as high, with a CVSS score of 7.5.
What is the impact of CVE-2023-4236?
CVE-2023-4236 may cause the 'named' process to terminate unexpectedly due to an assertion failure, leading to a denial of service (DoS) condition.
How can I mitigate CVE-2023-4236?
To mitigate CVE-2023-4236, it is recommended to update BIND 9 to a version that includes the necessary fixes, such as 9.18.19.
- collector/oss-sec
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- alias/CVE-2023-4236
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- version/isc bind/9.18.11-s1
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- vendor/debian
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- version/debian debian linux/10.0
- version/debian debian linux/11.0
- vendor/netapp
- canonical/netapp h300s firmware
- canonical/netapp h300s
- canonical/netapp h500s firmware
- canonical/netapp h500s
- canonical/netapp h700s firmware
- canonical/netapp h700s
- canonical/netapp h410s firmware
- canonical/netapp h410s
- canonical/netapp h410c firmware
- canonical/netapp h410c