CVE-2020-8623: A flaw in native PKCS#11 code can lead to a remotely triggerable assertion failure in pk11.c
First published: Thu Aug 20 2020(Updated: )
In BIND 9.10.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.10.5-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker that can reach a vulnerable system with a specially crafted query packet can trigger a crash. To be vulnerable, the system must: * be running BIND that was built with "--enable-native-pkcs11" * be signing one or more zones with an RSA key * be able to receive queries from a possible attacker
Credit: security-officer@isc.org security-officer@isc.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ISC BIND | >=9.10.0<=9.11.21 | |
| ISC BIND | >=9.12.1<=9.16.5 | |
| ISC BIND | >=9.17.0<=9.17.3 | |
| ISC BIND | =9.10.5-s1 | |
| ISC BIND | =9.11.21-s1 | |
| Fedoraproject Fedora | =31 | |
| Fedoraproject Fedora | =32 | |
| openSUSE Leap | =15.1 | |
| openSUSE Leap | =15.2 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =20.04 | |
| Synology DNS Server | <2.2.2-5027 | |
| Netapp Steelstore Cloud Integrated Storage | ||
| debian/bind9 | 1:9.16.50-1~deb11u2 1:9.16.50-1~deb11u1 1:9.18.28-1~deb12u2 1:9.20.4-3 |
Remedy
Upgrade to the patched release most closely related to your current version of BIND: BIND 9.11.22 BIND 9.16.6 BIND 9.17.4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. BIND 9.11.22-S1
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Reference Links
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
- https://kb.isc.org/docs/cve-2020-8623
- https://lists.debian.org/debian-lts-announce/2020/08/msg00053.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DQN62GBMCIC5AY4KYADGXNKVY6AJKSJE/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKAMJZXR66P6S5LEU4SN7USSNCWTXEXP/
- https://security.gentoo.org/glsa/202008-19
- https://security.netapp.com/advisory/ntap-20200827-0003/
- https://usn.ubuntu.com/4468-1/
- https://www.debian.org/security/2020/dsa-4752
- https://www.synology.com/security/advisory/Synology_SA_20_19
- https://launchpad.net/bugs/cve/CVE-2020-8623
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DQN62GBMCIC5AY4KYADGXNKVY6AJKSJE/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKAMJZXR66P6S5LEU4SN7USSNCWTXEXP/
- https://gitlab.isc.org/isc-projects/bind9/commit/ac3862a5da95bb07b6cf748b0958175687a9de1d
- https://gitlab.isc.org/isc-projects/bind9/commit/8d807cc21655eaa6e6a08afafeec3682c0f3f2ab
- https://security-tracker.debian.org/tracker/CVE-2020-8623
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8623
- https://nvd.nist.gov/vuln/detail/CVE-2020-8623
- https://ubuntu.com/security/CVE-2020-8623
Frequently Asked Questions
What is CVE-2020-8623?
CVE-2020-8623 is a vulnerability in BIND DNS software that allows an attacker to crash a vulnerable system with a specially crafted query packet.
Which versions of BIND are affected by CVE-2020-8623?
BIND versions 9.10.0 to 9.11.21, 9.12.0 to 9.16.5, and 9.17.0 to 9.17.3 are affected by CVE-2020-8623.
How can an attacker exploit the CVE-2020-8623 vulnerability?
An attacker can exploit the CVE-2020-8623 vulnerability by sending a specially crafted query packet to a vulnerable BIND DNS server.
What is the severity of CVE-2020-8623?
CVE-2020-8623 has a severity score of 7.5 (High).
Are there any references for CVE-2020-8623?
Yes, you can find references for CVE-2020-8623 at the following links: [Link 1](https://kb.isc.org/docs/cve-2020-8623), [Link 2](https://gitlab.isc.org/isc-projects/bind9/commit/ac3862a5da95bb07b6cf748b0958175687a9de1d), [Link 3](https://gitlab.isc.org/isc-projects/bind9/commit/8d807cc21655eaa6e6a08afafeec3682c0f3f2ab).
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