CVE-2020-8617
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of service disruption.
- Exploit odds
- 93.3% chance of exploitation in the next 30 days (EPSS). Higher than most.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 93.3% in the next 30 days (EPSS).
- Severity: 7.5 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 93.3% · EPSS, next 30 days
- Weakness
- CWE-617
- Record status
- Modified
Affected
- Isc Bind ≤ 9.11.18
- Isc Bind ≤ 9.12.4
- Isc Bind ≤ 9.13.7
- Isc Bind ≤ 9.14.11
- Isc Bind ≤ 9.15.6
- Isc Bind ≤ 9.16.2
- Isc Bind ≤ 9.17.1
- Isc Bind 9.12.4
Attack profile CVSS 3.1 · 7.5
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2020-8617.md and follow it. Check whether this project is affected by CVE-2020-8617. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- http://www.openwall.com/lists/oss-security/2020/05/19/4
- https://kb.isc.org/docs/cve-2020-8617
- http://www.openwall.com/lists/oss-security/2020/05/19/4
- https://kb.isc.org/docs/cve-2020-8617
References
- 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%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/
- https://usn.ubuntu.com/4365-1/
- https://usn.ubuntu.com/4365-2/
- https://www.debian.org/security/2020/dsa-4689
- 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%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/
- https://usn.ubuntu.com/4365-1/
- https://usn.ubuntu.com/4365-2/
- https://www.debian.org/security/2020/dsa-4689