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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1263 JSA11123 - 2021-04 Security Bulletin: Junos OS: MX Series: DDoS LACP violation upon receipt of specific layer 2 frames in EVPN-VXLAN deployment 15 April 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Junos OS: MX Series Publisher: Juniper Networks Operating System: Juniper Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-0228 Original Bulletin: http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11123 - --------------------------BEGIN INCLUDED TEXT-------------------- 2021-04 Security Bulletin: Junos OS: MX Series: DDoS LACP violation upon receipt of specific layer 2 frames in EVPN-VXLAN deployment (CVE-2021-0228) Article ID : JSA11123 Last Updated: 14 Apr 2021 Version : 1.0 Product Affected: This issue affects Junos OS 15.1, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3. Affected platforms: MX Series. Problem: 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: o 15.1 versions prior to 15.1R7-S9; o 17.3 versions prior to 17.3R3-S11; o 17.4 versions prior to 17.4R3-S4; o 18.1 versions prior to 18.1R3-S12; o 18.2 versions prior to 18.2R2-S8, 18.2R3-S8; o 18.3 versions prior to 18.3R3-S4; o 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; o 19.1 versions prior to 19.1R3-S4; o 19.2 versions prior to 19.2R1-S6; o 19.3 versions prior to 19.3R3-S2; o 19.4 versions prior to 19.4R2-S4, 19.4R3-S2; o 20.1 versions prior to 20.1R2, 20.1R3; o 20.2 versions prior to 20.2R2-S1, 20.2R3; o 20.3 versions prior to 20.3R1-S1, 20.3R2; The DDoS feature is enabled by default, there is no specific config stanza required to enable DDoS protection. The example of EVPN-VXLAN configuration stanza affected by this issue is as follows: [protocols evpn] [routing-instances <name> protocols evpn] Juniper SIRT is not aware of any malicious exploitation of this vulnerability. This issue was seen during production usage. This issue has been assigned CVE-2021-0228 . Solution: 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. This issue is being tracked as 1512033 . Workaround: DDoS for LACP can be disabled: set system ddos-protection protocols lacp aggregate disable-routing-engine set system ddos-protection protocols lacp aggregate disable-fpc Implementation: Software releases or updates are available for download at https:// support.juniper.net/support/downloads/ Modification History: 2021-04-14: Initial Publication. CVSS Score: 6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Severity Level: Medium Severity Assessment: Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories." - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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