Vulnerability Description
Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Isc | Bind | >= 9.0.0, <= 9.11.18 |
| Debian | Debian Linux | 8.0 |
| Fedoraproject | Fedora | 31 |
| Opensuse | Leap | 15.1 |
| Canonical | Ubuntu Linux | 12.04 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlMailing ListThird Party Advisory
- http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.htmlThird Party AdvisoryVDB Entry
- http://www.openwall.com/lists/oss-security/2020/05/19/4Mailing ListPatchThird Party Advisory
- https://kb.isc.org/docs/cve-2020-8617PatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00031.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.netapp.com/advisory/ntap-20200522-0002/Third Party Advisory
- https://usn.ubuntu.com/4365-1/Third Party Advisory
- https://usn.ubuntu.com/4365-2/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4689Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlMailing ListThird Party Advisory
- http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.htmlThird Party AdvisoryVDB Entry
FAQ
What is CVE-2020-8617?
CVE-2020-8617 is a vulnerability with a CVSS score of 7.5 (HIGH). Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the ser...
How severe is CVE-2020-8617?
CVE-2020-8617 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-8617?
Check the references section above for vendor advisories and patch information. Affected products include: Isc Bind, Debian Debian Linux, Fedoraproject Fedora, Opensuse Leap, Canonical Ubuntu Linux.