CVE-2020-1685

{"containers": {"cna": {"affected": [{"platforms": ["EX4600, QFX5K Series"], "product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"status": "unaffected", "version": "18.1R3"}, {"lessThan": "18.1R3-S7", "status": "affected", "version": "18.1", "versionType": "custom"}, {"lessThan": "18.2R2-S7, 18.2R3-S1", "status": "affected", "version": "18.2", "versionType": "custom"}, {"lessThan": "18.3R1-S5, 18.3R2-S4, 18.3R3", "status": "affected", "version": "18.3", "versionType": "custom"}, {"lessThan": "18.4R1-S7, 18.4R2-S1, 18.4R3", "status": "affected", "version": "18.4", "versionType": "custom"}, {"lessThan": "19.1R1-S5, 19.1R2", "status": "affected", "version": "19.1", "versionType": "custom"}, {"lessThan": "19.2R1-S5, 19.2R2", "status": "affected", "version": "19.2", "versionType": "custom"}]}], "configurations": [{"lang": "en", "value": "A sample VXLAN configuration is shown below:\n\n evpn {\n encapsulation vxlan;\n }"}], "datePublic": "2020-10-14T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "When configuring stateless firewall filters in Juniper Networks EX4600 and QFX 5000 Series devices using Virtual Extensible LAN protocol (VXLAN), the discard action will fail to discard traffic under certain conditions. Given a firewall filter configuration similar to: family ethernet-switching { filter L2-VLAN { term ALLOW { from { user-vlan-id 100; } then { accept; } } term NON-MATCH { then { discard; } } when there is only one term containing a 'user-vlan-id' match condition, and no other terms in the firewall filter except discard, the discard action for non-matching traffic will only discard traffic with the same VLAN ID specified under 'user-vlan-id'. Other traffic (e.g. VLAN ID 200) will not be discarded. This unexpected behavior can lead to unintended traffic passing through the interface where the firewall filter is applied. This issue only affects systems using VXLANs. This issue affects Juniper Networks Junos OS on QFX5K Series: 18.1 versions prior to 18.1R3-S7, except 18.1R3; 18.2 versions prior to 18.2R2-S7, 18.2R3-S1; 18.3 versions prior to 18.3R1-S5, 18.3R2-S4, 18.3R3; 18.4 versions prior to 18.4R1-S7, 18.4R2-S1, 18.4R3; 19.1 versions prior to 19.1R1-S5, 19.1R2; 19.2 versions prior to 19.2R1-S5, 19.2R2."}], "exploits": [{"lang": "en", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-203", "description": "CWE-203 Information Exposure Through Discrepancy", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2020-10-16T20:31:36.000Z", "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://kb.juniper.net/JSA11082"}], "solutions": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: Junos OS 18.1R3-S7, 18.2R2-S7, 18.2R3-S1, 18.3R1-S5, 18.3R2-S4, 18.3R3, 18.4R1-S7, 18.4R2-S1, 18.4R3, 19.1R1-S5, 19.1R2, 19.2R1-S5, 19.2R2, 19.3R1, and all subsequent releases."}], "source": {"advisory": "JSA11082", "defect": ["1446489"], "discovery": "INTERNAL"}, "title": "Junos OS: EX4600, QFX5K Series: Stateless firewall filter matching 'user-vlan-id' will cause incomplete discard action", "workarounds": [{"lang": "en", "value": "Avoid using the user-vlan-id match criteria."}], "x_generator": {"engine": "Vulnogram 0.0.9"}, "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "sirt@juniper.net", "DATE_PUBLIC": "2020-10-14T16:00:00.000Z", "ID": "CVE-2020-1685", "STATE": "PUBLIC", "TITLE": "Junos OS: EX4600, QFX5K Series: Stateless firewall filter matching 'user-vlan-id' will cause incomplete discard action"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Junos OS", "version": {"version_data": [{"platform": "EX4600, QFX5K Series", "version_affected": "<", "version_name": "18.1", "version_value": "18.1R3-S7"}, {"platform": "EX4600, QFX5K Series", "version_affected": "<", "version_name": "18.2", "version_value": "18.2R2-S7, 18.2R3-S1"}, {"platform": "EX4600, QFX5K Series", "version_affected": "<", "version_name": "18.3", "version_value": "18.3R1-S5, 18.3R2-S4, 18.3R3"}, {"platform": "EX4600, QFX5K Series", "version_affected": "<", "version_name": "18.4", "version_value": "18.4R1-S7, 18.4R2-S1, 18.4R3"}, {"platform": "EX4600, QFX5K Series", "version_affected": "<", "version_name": "19.1", "version_value": "19.1R1-S5, 19.1R2"}, {"platform": "EX4600, QFX5K Series", "version_affected": "<", "version_name": "19.2", "version_value": "19.2R1-S5, 19.2R2"}, {"platform": "EX4600, QFX5K Series", "version_affected": "!", "version_value": "18.1R3"}]}}]}, "vendor_name": "Juniper Networks"}]}}, "configuration": [{"lang": "en", "value": "A sample VXLAN configuration is shown below:\n\n evpn {\n encapsulation vxlan;\n }"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "When configuring stateless firewall filters in Juniper Networks EX4600 and QFX 5000 Series devices using Virtual Extensible LAN protocol (VXLAN), the discard action will fail to discard traffic under certain conditions. Given a firewall filter configuration similar to: family ethernet-switching { filter L2-VLAN { term ALLOW { from { user-vlan-id 100; } then { accept; } } term NON-MATCH { then { discard; } } when there is only one term containing a 'user-vlan-id' match condition, and no other terms in the firewall filter except discard, the discard action for non-matching traffic will only discard traffic with the same VLAN ID specified under 'user-vlan-id'. Other traffic (e.g. VLAN ID 200) will not be discarded. This unexpected behavior can lead to unintended traffic passing through the interface where the firewall filter is applied. This issue only affects systems using VXLANs. This issue affects Juniper Networks Junos OS on QFX5K Series: 18.1 versions prior to 18.1R3-S7, except 18.1R3; 18.2 versions prior to 18.2R2-S7, 18.2R3-S1; 18.3 versions prior to 18.3R1-S5, 18.3R2-S4, 18.3R3; 18.4 versions prior to 18.4R1-S7, 18.4R2-S1, 18.4R3; 19.1 versions prior to 19.1R1-S5, 19.1R2; 19.2 versions prior to 19.2R1-S5, 19.2R2."}]}, "exploit": [{"lang": "en", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "generator": {"engine": "Vulnogram 0.0.9"}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-203 Information Exposure Through Discrepancy"}]}]}, "references": {"reference_data": [{"name": "https://kb.juniper.net/JSA11082", "refsource": "CONFIRM", "url": "https://kb.juniper.net/JSA11082"}]}, "solution": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: Junos OS 18.1R3-S7, 18.2R2-S7, 18.2R3-S1, 18.3R1-S5, 18.3R2-S4, 18.3R3, 18.4R1-S7, 18.4R2-S1, 18.4R3, 19.1R1-S5, 19.1R2, 19.2R1-S5, 19.2R2, 19.3R1, and all subsequent releases."}], "source": {"advisory": "JSA11082", "defect": ["1446489"], "discovery": "INTERNAL"}, "work_around": [{"lang": "en", "value": "Avoid using the user-vlan-id match criteria."}]}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T06:46:29.658Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://kb.juniper.net/JSA11082"}]}]}, "cveMetadata": {"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "assignerShortName": "juniper", "cveId": "CVE-2020-1685", "datePublished": "2020-10-16T20:31:36.745Z", "dateReserved": "2019-11-04T00:00:00.000Z", "dateUpdated": "2024-09-16T20:12:52.364Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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Given a firewall filter configuration similar to: family ethernet-switching { filter L2-VLAN { term ALLOW { from { user-vlan-id 100; } then { accept; } } term NON-MATCH { then { discard; } } when there is only one term containing a 'user-vlan-id' match condition, and no other terms in the firewall filter except discard, the discard action for non-matching traffic will only discard traffic with the same VLAN ID specified under 'user-vlan-id'. Other traffic (e.g. VLAN ID 200) will not be discarded. This unexpected behavior can lead to unintended traffic passing through the interface where the firewall filter is applied. This issue only affects systems using VXLANs. This issue affects Juniper Networks Junos OS on QFX5K Series: 18.1 versions prior to 18.1R3-S7, except 18.1R3; 18.2 versions prior to 18.2R2-S7, 18.2R3-S1; 18.3 versions prior to 18.3R1-S5, 18.3R2-S4, 18.3R3; 18.4 versions prior to 18.4R1-S7, 18.4R2-S1, 18.4R3; 19.1 versions prior to 19.1R1-S5, 19.1R2; 19.2 versions prior to 19.2R1-S5, 19.2R2."}, {"lang": "es", "value": "Cuando se configuran filtros de firewall sin estado en dispositivos Juniper Networks EX4600 y QFX 5000 Series utilizando el protocolo Virtual Extensible LAN (VXLAN), la acci\u00f3n de descarte presentar\u00e1 un fallo al descartar el tr\u00e1fico bajo determinadas condiciones.&#xa0;Dada una configuraci\u00f3n de filtro de firewall similar a: family ethernet-switching { filter L2-VLAN { term ALLOW { from { user-vlan-id 100; } then { accept; } } term NON-MATCH { then { discard; } } cuando solo existe un t\u00e9rmino que contiene una condici\u00f3n de coincidencia \"user-vlan-id\" y no existe otros t\u00e9rminos en el filtro de firewall excepto descartar, la acci\u00f3n de descarte para el tr\u00e1fico que no coincide solo descartar\u00e1 el tr\u00e1fico con la misma ID de VLAN especificada en \"user-vlan-id\".&#xa0;El resto del tr\u00e1fico (por ejemplo, VLAN ID 200) no ser\u00e1 descartada.&#xa0;Este comportamiento inesperado puede conllevar que el tr\u00e1fico no deseado pase por medio de la interfaz donde se aplica el filtro de firewall.&#xa0;Este problema solo afecta a los sistemas que usan VXLAN.&#xa0;Este problema afecta a Juniper Networks Junos OS en la serie QFX5K: versiones 18.1 anteriores a 18.1R3-S7, excepto 18.1R3;&#xa0;versiones 18.2 anteriores a 18.2R2-S7, 18.2R3-S1;&#xa0;versiones 18.3 anteriores a 18.3R1-S5, 18.3R2-S4, 18.3R3;&#xa0;versiones 18.4 anteriores a 18.4R1-S7, 18.4R2-S1, 18.4R3;&#xa0; versiones 19.1anteriores a 19.1R1-S5, 19.1R2;&#xa0; versiones 19.2 anteriores a 19.2R1-S5, 19.2R2.&#xa0;19.1R2;&#xa0; versiones 19.2 anteriores a 19.2R1-S5, 19.2R2.&#xa0;19.1R2;&#xa0; versiones 19.2 anteriores a 19.2R1-S5, 19.2R2"}], "id": "CVE-2020-1685", "lastModified": "2026-06-17T03:02:12.190", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "sirt@juniper.net", "type": "Secondary"}]}, "published": "2020-10-16T21:15:14.177", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11082"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11082"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-203"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-203"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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