CVE-2020-8617: A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c
First published: Tue May 19 2020(Updated: )
ISC BIND is vulnerable to a denial of service, caused by a logic error in code which checks TSIG validity. A remote attacker could exploit this vulnerability to trigger an assertion failure in tsig.c.
Credit: security-officer@isc.org security-officer@isc.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ISC BIND | >=9.0.0<=9.11.18 | |
| ISC BIND | >=9.12.0<=9.12.4 | |
| ISC BIND | >=9.13.0<=9.13.7 | |
| ISC BIND | >=9.14.0<=9.14.11 | |
| ISC BIND | >=9.15.0<=9.15.6 | |
| ISC BIND | >=9.16.0<=9.16.2 | |
| ISC BIND | >=9.17.0<=9.17.1 | |
| ISC BIND | =9.12.4-p1 | |
| ISC BIND | =9.12.4-p2 | |
| ISC BIND | =9.9.3-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 | =9.11.6-s1 | |
| ISC BIND | =9.11.7-s1 | |
| ISC BIND | =9.11.8-s1 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =31 | |
| Fedoraproject Fedora | =32 | |
| openSUSE Leap | =15.1 | |
| openSUSE Leap | =15.2 | |
| Canonical Ubuntu Linux | =12.04 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =19.10 | |
| Canonical Ubuntu Linux | =20.04 | |
| ubuntu/bind9 | <1:9.11.3+dfsg-1ubuntu1.12 | 1:9.11.3+dfsg-1ubuntu1.12 |
| ubuntu/bind9 | <1:9.11.5. | 1:9.11.5. |
| ubuntu/bind9 | <1:9.16.1-0ubuntu2.1 | 1:9.16.1-0ubuntu2.1 |
| ubuntu/bind9 | <1:9.9.5.dfsg-3ubuntu0.19+ | 1:9.9.5.dfsg-3ubuntu0.19+ |
| ubuntu/bind9 | <1:9.10.3.dfsg. | 1:9.10.3.dfsg. |
| IBM Cloud Pak for Security (CP4S) | <=1.7.2.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.7.1.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.7.0.0 | |
| debian/bind9 | 1:9.16.48-1 1:9.16.50-1~deb11u1 1:9.18.24-1 1:9.18.28-1~deb12u2 1:9.20.1-1 |
Remedy
Upgrade to the patched release most closely related to your current version of BIND: BIND 9.11.19 BIND 9.14.12 BIND 9.16.3 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. BIND 9.11.19-S1
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Reference Links
- https://exchange.xforce.ibmcloud.com/vulnerabilities/182127
- https://www.ibm.com/support/pages/node/6493729 (Advisory)
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
- http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.html
- http://www.openwall.com/lists/oss-security/2020/05/19/4
- https://kb.isc.org/docs/cve-2020-8617
- https://lists.debian.org/debian-lts-announce/2020/05/msg00031.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/
- https://security.netapp.com/advisory/ntap-20200522-0002/
- https://usn.ubuntu.com/4365-1/
- https://usn.ubuntu.com/4365-2/
- https://www.debian.org/security/2020/dsa-4689
- https://launchpad.net/bugs/cve/CVE-2020-8617
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/
- https://kb.isc.org/docs/cve-2020-8617-faq-and-supplemental-information
- https://security-tracker.debian.org/tracker/CVE-2020-8617
- https://ubuntu.com/security/notices/USN-4365-1
- https://ubuntu.com/security/notices/USN-4365-2
- https://www.cve.org/CVERecord?id=CVE-2020-8617
- https://nvd.nist.gov/vuln/detail/CVE-2020-8617
- https://ubuntu.com/security/CVE-2020-8617
Frequently Asked Questions
What is CVE-2020-8617?
CVE-2020-8617 is a vulnerability in ISC BIND that allows an attacker to cause a denial-of-service by exploiting a logic error in the code that checks TSIG validation.
How severe is CVE-2020-8617?
CVE-2020-8617 has a severity score of 7.5 out of 10, indicating a high severity vulnerability.
Which software versions are affected by CVE-2020-8617?
CVE-2020-8617 affects BIND versions 9.0.0 to 9.11.18, 9.12.0 to 9.12.4-p2, 9.13.0 to 9.13.7, 9.14.0 to 9.14.11, 9.15.0 to 9.15.6, 9.16.0 to 9.16.2, and 9.17.0 to 9.17.1.
How can I fix CVE-2020-8617?
To fix CVE-2020-8617, it is recommended to upgrade to the patched versions of BIND: 9.11.5.P4+dfsg-5.1+deb10u7 or later for Debian, and follow the guidance provided by the vendor for other affected software.
Where can I find more information about CVE-2020-8617?
You can find more information about CVE-2020-8617 in the references provided: [link1](http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html), [link2](http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html), [link3](http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.html).
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