CVE-2020-8617

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.

• CWE-617

• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlMailing List, Third Party Advisory
• http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.htmlThird Party Advisory, VDB Entry
• http://www.openwall.com/lists/oss-security/2020/05/19/4Mailing List, Patch, Third Party Advisory
• https://kb.isc.org/docs/cve-2020-8617Patch, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2020/05/msg00031.htmlMailing List, Third Party Advisory
• 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://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 List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlMailing List, Third Party Advisory
• http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.htmlThird Party Advisory, VDB Entry
• http://www.openwall.com/lists/oss-security/2020/05/19/4Mailing List, Patch, Third Party Advisory
• https://kb.isc.org/docs/cve-2020-8617Patch, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2020/05/msg00031.htmlMailing List, Third Party Advisory
• 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://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

Published

May 19, 2020

Last Modified

Jun 17, 2026

Status

Modified