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[ISC] document BIND9 CVE-2020-8616, CVE-2020-8617
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Brian Conry
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{
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"data_type": "CVE",
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"data_format": "MITRE",
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"data_version": "4.0",
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"CVE_data_meta": {
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"AKA": "NSNSAttack",
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"ASSIGNER": "security-officer@isc.org",
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"DATE_PUBLIC": "2020-05-19T08:59:44.000Z",
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"ID": "CVE-2020-8616",
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"ASSIGNER": "cve@mitre.org",
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"STATE": "RESERVED"
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"STATE": "PUBLIC",
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"TITLE": "BIND does not sufficiently limit the number of fetches performed when processing referrals"
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},
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"affects": {
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"vendor": {
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"vendor_data": [
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{
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"product": {
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"product_data": [
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{
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"product_name": "BIND9",
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"version": {
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"version_data": [
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{
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"version_affected": "=",
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"version_value": "9.0.0 -> 9.11.18, 9.12.0 -> 9.12.4-P2, 9.14.0 -> 9.14.11, 9.16.0 -> 9.16.2, and releases 9.17.0 -> 9.17.1 of the 9.17 experimental development branch. All releases in the obsolete 9.13 and 9.15 development branches. All releases of BIND Supported Preview Edition from 9.9.3-S1 -> 9.11.18-S1"
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}
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]
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}
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}
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]
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},
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"vendor_name": "ISC"
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}
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]
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}
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},
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"credit": [
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{
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"lang": "eng",
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"value": "ISC would like to thank Lior Shafir and Yehuda Afek of Tel Aviv University and Anat Bremler-Barr of Interdisciplinary Center (IDC) Herzliya for discovering and reporting this issue."
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}
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],
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"data_format": "MITRE",
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"data_type": "CVE",
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"data_version": "4.0",
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"description": {
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"description_data": [
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{
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"lang": "eng",
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"value": "** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided."
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"value": "A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral.\n\nThis has at least two potential effects:\n\n The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and\n The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor."
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}
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]
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}
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},
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"generator": {
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"engine": "Vulnogram 0.0.9"
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},
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"impact": {
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"cvss": {
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"attackComplexity": "LOW",
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"attackVector": "NETWORK",
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"availabilityImpact": "HIGH",
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"baseScore": 8.6,
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"baseSeverity": "HIGH",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"privilegesRequired": "NONE",
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"scope": "CHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
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"version": "3.1"
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}
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},
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"problemtype": {
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"problemtype_data": [
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{
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"description": [
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{
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"lang": "eng",
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"value": "In order for a server performing recursion to locate records in the DNS graph it must be capable of processing referrals, such as those received when it attempts to query an authoritative server for a record which is delegated elsewhere. In its original design BIND (as well as other nameservers) does not sufficiently limit the number of fetches which may be performed while processing a referral response. BIND 9.0.0 -> 9.11.18, 9.12.0 -> 9.12.4-P2, 9.14.0 -> 9.14.11, 9.16.0 -> 9.16.2, and releases 9.17.0 -> 9.17.1 of the 9.17 experimental development branch. All releases in the obsolete 9.13 and 9.15 development branches. All releases of BIND Supported Preview Edition from 9.9.3-S1 -> 9.11.18-S1."
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}
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]
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}
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]
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},
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"references": {
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"reference_data": [
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{
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"name": "https://kb.isc.org/docs/cve-2020-8616",
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"refsource": "CONFIRM",
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"url": "https://kb.isc.org/docs/cve-2020-8616"
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},
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{
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"name": "http://www.nxnsattack.com",
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"refsource": "MISC",
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"url": "http://www.nxnsattack.com"
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}
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]
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},
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"solution": [
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{
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"lang": "eng",
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"value": "Upgrade to the patched release most closely related to your current version of BIND:\n\n BIND 9.11.19\n BIND 9.14.12\n BIND 9.16.3\n\nBIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.\n\n BIND 9.11.19-S1"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"work_around": [
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{
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"lang": "eng",
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"value": "None"
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}
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]
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}
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@ -1,18 +1,99 @@
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{
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"data_type": "CVE",
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"data_format": "MITRE",
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"data_version": "4.0",
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"CVE_data_meta": {
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"ASSIGNER": "security-officer@isc.org",
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"DATE_PUBLIC": "2020-05-19T08:59:49.000Z",
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"ID": "CVE-2020-8617",
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"ASSIGNER": "cve@mitre.org",
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"STATE": "RESERVED"
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"STATE": "PUBLIC",
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"TITLE": "A logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.c"
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},
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"affects": {
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"vendor": {
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"vendor_data": [
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{
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"product": {
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"product_data": [
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{
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"product_name": "BIND9",
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"version": {
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"version_data": [
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{
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"version_affected": "=",
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"version_value": "9.0.0 -> 9.11.18, 9.12.0 -> 9.12.4-P2, 9.14.0 -> 9.14.11, 9.16.0 -> 9.16.2, and releases 9.17.0 -> 9.17.1 of the 9.17 experimental development branch. All releases in the obsolete 9.13 and 9.15 development branches. All releases of BIND Supported Preview Edition from 9.9.3-S1 -> 9.11.18-S1"
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}
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]
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}
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}
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]
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},
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"vendor_name": "ISC"
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}
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]
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}
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},
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"data_format": "MITRE",
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"data_type": "CVE",
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"data_version": "4.0",
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"description": {
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"description_data": [
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{
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"lang": "eng",
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"value": "** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided."
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"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.\n\nSince 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.\n\nIn 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."
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}
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]
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}
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},
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"generator": {
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"engine": "Vulnogram 0.0.9"
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},
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"impact": {
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"cvss": {
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"attackComplexity": "LOW",
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"attackVector": "NETWORK",
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"availabilityImpact": "HIGH",
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"baseScore": 7.5,
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"baseSeverity": "HIGH",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"privilegesRequired": "NONE",
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"scope": "UNCHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"version": "3.1"
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}
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},
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"problemtype": {
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"problemtype_data": [
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{
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"description": [
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{
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"lang": "eng",
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"value": "An error in BIND code which checks the validity of messages containing TSIG resource records can be exploited by an attacker to trigger an assertion failure in tsig.c, resulting in denial of service to clients. BIND 9.0.0 -> 9.11.18, 9.12.0 -> 9.12.4-P2, 9.14.0 -> 9.14.11, 9.16.0 -> 9.16.2, and releases 9.17.0 -> 9.17.1 of the 9.17 experimental development branch. All releases in the obsolete 9.13 and 9.15 development branches. All releases of BIND Supported Preview Edition from 9.9.3-S1 -> 9.11.18-S1."
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}
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]
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}
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]
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},
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"references": {
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"reference_data": [
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{
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"name": "https://kb.isc.org/docs/cve-2020-8617",
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"refsource": "CONFIRM",
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"url": "https://kb.isc.org/docs/cve-2020-8617"
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}
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]
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},
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"solution": [
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{
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"lang": "eng",
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"value": "Upgrade to the patched release most closely related to your current version of BIND:\n\n BIND 9.11.19\n BIND 9.14.12\n BIND 9.16.3\n\nBIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.\n\n BIND 9.11.19-S1"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"work_around": [
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{
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"lang": "eng",
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"value": "None known."
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}
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]
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}
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