CVE-2021-25219: Lame cache can be abused to severely degrade resolver performance
First published: Wed Oct 27 2021(Updated: )
In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.
Credit: security-officer@isc.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| 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 | |
| ISC BIND | >=9.3.0<9.11.36 | |
| ISC BIND | >=9.12.0<9.16.22 | |
| ISC BIND | >=9.17.0<9.17.19 | |
| 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 | =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 | =9.11.21-s1 | |
| ISC BIND | =9.11.27-s1 | |
| ISC BIND | =9.11.29-s1 | |
| ISC BIND | =9.11.35-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 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| Fedoraproject Fedora | =35 | |
| Netapp H300s Firmware | ||
| Netapp H300s | ||
| Netapp H500s Firmware | ||
| Netapp H500s | ||
| Netapp H700s Firmware | ||
| Netapp H700s | ||
| Netapp H300e Firmware | ||
| Netapp H300e | ||
| Netapp H500e Firmware | ||
| Netapp H500e | ||
| Netapp H700e Firmware | ||
| Netapp H700e | ||
| Netapp H410s Firmware | ||
| Netapp H410s | ||
| Netapp H410c Firmware | ||
| Netapp H410c | ||
| Netapp Cloud Backup | ||
| Siemens Sinec Infrastructure Network Services | <1.0.1.1 | |
| Oracle HTTP Server | =12.2.1.3.0 | |
| Oracle HTTP Server | =12.2.1.4.0 | |
| Oracle ZFS Storage Appliance Kit | =8.8 |
Remedy
Upgrade to the patched release most closely related to your current version of BIND: BIND 9.11.36, BIND 9.16.22, BIND 9.17.19, or for BIND Supported Preview Edition (a special feature preview branch of BIND provided to eligible ISC support customers): BIND 9.11.36-S1, BIND 9.16.22-S1.
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Reference Links
- https://kb.isc.org/docs/cve-2021-25219
- https://gitlab.isc.org/isc-projects/bind9/commit/8fe18c0566c41228a568157287f5a44f96d37662
- https://gitlab.isc.org/isc-projects/bind9/commit/e4931584a34bdd0a0d18e4d918fb853bf5296787
- https://security-tracker.debian.org/tracker/CVE-2021-25219
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://kb.isc.org/v1/docs/cve-2021-25219
- https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EF4NAVRV4H3W4GA3LGGZYUKD3HSJBAVW/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YGV7SA27CTYLGFJSPUM3V36ZWK7WWDI4/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VAQSWG2ZVTX/
- https://security.gentoo.org/glsa/202210-25
- https://security.netapp.com/advisory/ntap-20211118-0002/
- https://www.debian.org/security/2021/dsa-4994
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTKC4E3HUOLYN5IA4EBL4VAQSWG2ZVTX/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGV7SA27CTYLGFJSPUM3V36ZWK7WWDI4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EF4NAVRV4H3W4GA3LGGZYUKD3HSJBAVW/
Frequently Asked Questions
What is the vulnerability ID for this security vulnerability?
The vulnerability ID for this security vulnerability is CVE-2021-25219.
What is the severity level of CVE-2021-25219?
CVE-2021-25219 has a severity level of 5.3, which is considered medium.
Which software versions are affected by CVE-2021-25219?
The affected software versions include BIND 9.3.0 to 9.11.35, 9.12.0 to 9.16.21, and 9.9.3-S1 to 9.11.35-S1, as well as 9.16.8-S1 to 9.16.21-S1 and 9.17.0 to 9.17.18.
How can I fix the vulnerability in BIND?
To fix the vulnerability in BIND, you should update to the patched versions mentioned in the vendor's security advisory.
Where can I find more information about CVE-2021-25219?
More information about CVE-2021-25219 can be found in the Siemens ProductCERT document and the ISC Knowledge Base article.
- collector/security-tracker-debian
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- version/isc bind/9.11.8-s1
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- version/isc bind/9.11.21-s1
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- canonical/fedoraproject fedora
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- 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 h300e firmware
- canonical/netapp h300e
- canonical/netapp h500e firmware
- canonical/netapp h500e
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- canonical/netapp h700e
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- canonical/oracle zfs storage appliance kit
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