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.

CVSS v3.0 5.9 MEDIUM
CVSS v2.0 4.3 MEDIUM

5.9^/10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

4.3^/10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:M/Au:N/C:N/I:N/A:P

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://kb.isc.org/docs/cve-2020-8617	Patch Vendor Advisory
http://www.openwall.com/lists/oss-security/2020/05/19/4	Mailing List Patch Third Party Advisory
https://www.debian.org/security/2020/dsa-4689	Third Party Advisory
https://security.netapp.com/advisory/ntap-20200522-0002/	Third Party Advisory
http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.html	Third Party Advisory VDB Entry
https://usn.ubuntu.com/4365-2/	Third Party Advisory
https://usn.ubuntu.com/4365-1/	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00031.html	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/	Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html	Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:isc:bind::::::::
	cpe:2.3:a:isc:bind:9.12.4:p1::::::
	cpe:2.3:a:isc:bind::::::::
	cpe:2.3:a:isc:bind:9.12.4:p2::::::
	cpe:2.3:a:isc:bind::::::::
	cpe:2.3:a:isc:bind::::::::
	cpe:2.3:a:isc:bind::::::::
	cpe:2.3:a:isc:bind::::::::
	cpe:2.3:a:isc:bind::::::::

Configuration 2 (hide)

OR	cpe:2.3:a:isc:bind:9.11.7:s1:::supported_preview:::*
	cpe:2.3:a:isc:bind:9.11.3:s1:::supported_preview:::*
	cpe:2.3:a:isc:bind:9.11.6:s1:::supported_preview:::*
	cpe:2.3:a:isc:bind:9.10.5:s1:::supported_preview:::*
	cpe:2.3:a:isc:bind:9.11.5:s5:::supported_preview:::*
	cpe:2.3:a:isc:bind:9.11.5:s3:::supported_preview:::*
	cpe:2.3:a:isc:bind:9.9.3:s1:::supported_preview:::*
	cpe:2.3:a:isc:bind:9.10.7:s1:::supported_preview:::*
	cpe:2.3:a:isc:bind:9.11.8:s1:::supported_preview:::*

Configuration 3 (hide)

OR	cpe:2.3:o:debian:debian_linux:8.0:::::::*
	cpe:2.3:o:debian:debian_linux:9.0:::::::*
	cpe:2.3:o:debian:debian_linux:10.0:::::::*

Configuration 4 (hide)

OR	cpe:2.3:o:fedoraproject:fedora:31:::::::*
	cpe:2.3:o:fedoraproject:fedora:32:::::::*

Configuration 5 (hide)

OR	cpe:2.3:o:opensuse:leap:15.1:::::::*
	cpe:2.3:o:opensuse:leap:15.2:::::::*

Configuration 6 (hide)

OR	cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:14.04::::esm:::
	cpe:2.3:o:canonical:ubuntu_linux:19.10:::::::*
	cpe:2.3:o:canonical:ubuntu_linux:20.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:16.04::::esm:::
	cpe:2.3:o:canonical:ubuntu_linux:12.04::::-:::

Information

Published : 2020-05-19 07:15

Updated : 2022-09-09 10:47

NVD link : CVE-2020-8617

Mitre link : CVE-2020-8617

JSON object : View

CWE

CWE-617

Reachable Assertion

Products Affected

fedoraproject

fedora

canonical

ubuntu_linux

opensuse

leap

debian

debian_linux

isc

bind

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://kb.isc.org/docs/cve-2020-8617", "name": "https://kb.isc.org/docs/cve-2020-8617", "tags": ["Patch", "Vendor Advisory"], "refsource": "CONFIRM"}, {"url": "http://www.openwall.com/lists/oss-security/2020/05/19/4", "name": "[oss-security] 20200519 Two vulnerabilities disclosed in BIND (CVE-2020-8616 and CVE-2020-8617)", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "refsource": "MLIST"}, {"url": "https://www.debian.org/security/2020/dsa-4689", "name": "DSA-4689", "tags": ["Third Party Advisory"], "refsource": "DEBIAN"}, {"url": "https://security.netapp.com/advisory/ntap-20200522-0002/", "name": "https://security.netapp.com/advisory/ntap-20200522-0002/", "tags": ["Third Party Advisory"], "refsource": "CONFIRM"}, {"url": "http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.html", "name": "http://packetstormsecurity.com/files/157836/BIND-TSIG-Denial-Of-Service.html", "tags": ["Third Party Advisory", "VDB Entry"], "refsource": "MISC"}, {"url": "https://usn.ubuntu.com/4365-2/", "name": "USN-4365-2", "tags": ["Third Party Advisory"], "refsource": "UBUNTU"}, {"url": "https://usn.ubuntu.com/4365-1/", "name": "USN-4365-1", "tags": ["Third Party Advisory"], "refsource": "UBUNTU"}, {"url": "https://lists.debian.org/debian-lts-announce/2020/05/msg00031.html", "name": "[debian-lts-announce] 20200530 [SECURITY] [DLA 2227-1] bind9 security update", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "MLIST"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/", "name": "FEDORA-2020-2d89cbcfd9", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "FEDORA"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/", "name": "FEDORA-2020-f9dcd4e9d5", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "FEDORA"}, {"url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html", "name": "openSUSE-SU-2020:1699", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "SUSE"}, {"url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html", "name": "openSUSE-SU-2020:1701", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "SUSE"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-617"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2020-8617", "ASSIGNER": "security-officer@isc.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 4.3, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "MEDIUM", "availabilityImpact": "PARTIAL", "confidentialityImpact": "NONE"}, "severity": "MEDIUM", "acInsufInfo": false, "impactScore": 2.9, "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.2}}, "publishedDate": "2020-05-19T14:15Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "9.12.4", "versionStartIncluding": "9.12.0"}, {"cpe23Uri": "cpe:2.3:a:isc:bind:9.12.4:p1:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "9.13.7", "versionStartIncluding": "9.13.0"}, {"cpe23Uri": "cpe:2.3:a:isc:bind:9.12.4:p2:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "9.17.1", "versionStartIncluding": "9.17.0"}, {"cpe23Uri": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "9.16.2", "versionStartIncluding": "9.16.0"}, {"cpe23Uri": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "9.14.11", "versionStartIncluding": "9.14.0"}, {"cpe23Uri": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "9.11.18", "versionStartIncluding": "9.0.0"}, {"cpe23Uri": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "9.15.6", "versionStartIncluding": "9.15.0"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:isc:bind:9.11.7:s1:*:*:supported_preview:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:isc:bind:9.11.3:s1:*:*:supported_preview:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:isc:bind:9.11.6:s1:*:*:supported_preview:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:isc:bind:9.10.5:s1:*:*:supported_preview:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:isc:bind:9.11.5:s5:*:*:supported_preview:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:isc:bind:9.11.5:s3:*:*:supported_preview:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:isc:bind:9.10.7:s1:*:*:supported_preview:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:isc:bind:9.11.8:s1:*:*:supported_preview:*:*:*", "cpe_name": [], "vulnerable": true}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*", "cpe_name": [], "vulnerable": true}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2022-09-09T17:47Z"}

5.9 /10

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

4.3 /10

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

JSON object

Attach tags to CVE-2020-8617

5.9^/10

4.3^/10

Attach tags to `CVE-2020-8617`