{ "CVE_data_meta": { "ASSIGNER": "sirt@juniper.net", "DATE_PUBLIC": "2021-04-14T16:00:00.000Z", "ID": "CVE-2021-0228", "STATE": "PUBLIC", "TITLE": "Junos OS: MX Series: DDoS LACP violation upon receipt of specific layer 2 frames in EVPN-VXLAN deployment" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "Junos OS", "version": { "version_data": [ { "platform": "MX Series", "version_affected": "<", "version_name": "15.1", "version_value": "15.1R7-S9" }, { "platform": "MX Series", "version_affected": "<", "version_name": "17.3", "version_value": "17.3R3-S11" }, { "platform": "MX Series", "version_affected": "<", "version_name": "17.4", "version_value": "17.4R3-S4" }, { "platform": "MX Series", "version_affected": "<", "version_name": "18.1", "version_value": "18.1R3-S12" }, { "platform": "MX Series", "version_affected": "<", "version_name": "18.2", "version_value": "18.2R2-S8, 18.2R3-S8" }, { "platform": "MX Series", "version_affected": "<", "version_name": "18.3", "version_value": "18.3R3-S4" }, { "platform": "MX Series", "version_affected": "<", "version_name": "18.4", "version_value": "18.4R1-S8, 18.4R2-S7, 18.4R3-S7" }, { "platform": "MX Series", "version_affected": "<", "version_name": "19.1", "version_value": "19.1R3-S4" }, { "platform": "MX Series", "version_affected": "<", "version_name": "19.2", "version_value": "19.2R1-S6" }, { "platform": "MX Series", "version_affected": "<", "version_name": "19.3", "version_value": "19.3R3-S2" }, { "platform": "MX Series", "version_affected": "<", "version_name": "19.4", "version_value": "19.4R2-S4, 19.4R3-S2" }, { "platform": "MX Series", "version_affected": "<", "version_name": "20.1", "version_value": "20.1R2, 20.1R3" }, { "platform": "MX Series", "version_affected": "<", "version_name": "20.2", "version_value": "20.2R2-S1, 20.2R3" }, { "platform": "MX Series", "version_affected": "<", "version_name": "20.3", "version_value": "20.3R1-S1, 20.3R2" } ] } } ] }, "vendor_name": "Juniper Networks" } ] } }, "configuration": [ { "lang": "eng", "value": "The DDoS feature is enabled by default, there is no specific config stanza required to enable DDoS protection.\n\nThe example of EVPN-VXLAN configuration stanza affected by this issue is as follows:\n[protocols evpn]\n[routing-instances protocols evpn]" } ], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "An improper check for unusual or exceptional conditions vulnerability in Juniper Networks MX Series platforms with Trio-based MPC (Modular Port Concentrator) deployed in (Ethernet VPN) EVPN-(Virtual Extensible LAN) VXLAN configuration, may allow an attacker sending specific Layer 2 traffic to cause Distributed Denial of Service (DDoS) protection to trigger unexpectedly, resulting in traffic impact. Continued receipt and processing of this specific Layer 2 frames will sustain the Denial of Service (DoS) condition. An indication of compromise is to check DDOS LACP violations: user@device> show ddos-protection protocols statistics brief | match lacp This issue only affects the MX Series platforms with Trio-based MPC. No other products or platforms are affected. This issue affects: Juniper Networks Junos OS on MX Series: 15.1 versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S8; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R1-S6; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2;" } ] }, "exploit": [ { "lang": "eng", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability." } ], "generator": { "engine": "Vulnogram 0.0.9" }, "impact": { "cvss": { "attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" } }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "CWE-754 Improper Check for Unusual or Exceptional Conditions" } ] } ] }, "references": { "reference_data": [ { "refsource": "MISC", "url": "https://kb.juniper.net/JSA11123", "name": "https://kb.juniper.net/JSA11123" } ] }, "solution": [ { "lang": "eng", "value": "The following software releases have been updated to resolve this specific issue: 15.1R7-S9, 17.3R3-S11, 17.4R3-S4, 18.1R3-S12, 18.2R2-S8, 18.2R3-S8, 18.3R3-S4, 18.4R1-S8, 18.4R2-S7, 18.4R3-S7, 19.1R3-S4, 19.2R1-S6, 19.3R3-S2, 19.4R2-S4, 19.4R3-S2, 20.1R2, 20.1R3, 20.2R2-S1, 20.2R3, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases.\n" } ], "source": { "advisory": "JSA11123", "defect": [ "1512033" ], "discovery": "USER" }, "work_around": [ { "lang": "eng", "value": "DDoS for LACP can be disabled:\n\n set system ddos-protection protocols lacp aggregate disable-routing-engine\n set system ddos-protection protocols lacp aggregate disable-fpc\n" } ] }