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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1258 JSA11118 - 2021-04 Security Bulletin: Junos OS: ACX5448, ACX710: BFD sessions might flap due to high rate of transit ARP packets 15 April 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Junos OS: ACX5448 Junos OS: ACX710 Publisher: Juniper Networks Operating System: Juniper Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-0216 Original Bulletin: http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11118 - --------------------------BEGIN INCLUDED TEXT-------------------- 2021-04 Security Bulletin: Junos OS: ACX5448, ACX710: BFD sessions might flap due to high rate of transit ARP packets (CVE-2021-0216) Article ID : JSA11118 Last Updated: 14 Apr 2021 Version : 1.0 Product Affected: This issue affects Junos OS 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2. Affected platforms: ACX5448, ACX710 Problem: A vulnerability in Juniper Networks Junos OS running on the ACX5448 and ACX710 platforms may cause BFD sessions to flap when a high rate of transit ARP packets are received. This, in turn, may impact routing protocols and network stability, leading to a Denial of Service (DoS) condition. When a high rate of transit ARP packets are exceptioned to the CPU and BFD flaps, the following log messages may be seen: bfdd[15864]: BFDD_STATE_UP_TO_DOWN: BFD Session 192.168.14.3 (IFL 232) state Up - -> Down LD/RD(17/19) Up time:11:38:17 Local diag: CtlExpire Remote diag: None Reason: Detect Timer Expiry. bfdd[15864]: BFDD_TRAP_SHOP_STATE_DOWN: local discriminator: 17, new state: down, interface: irb.998, peer addr: 192.168.14.3 rpd[15839]: RPD_ISIS_ADJDOWN: IS-IS lost L2 adjacency to peer on irb.998, reason: BFD Session Down bfdd[15864]: BFDD_TRAP_SHOP_STATE_UP: local discriminator: 17, new state: up, interface: irb.998, peer addr: 192.168.14.3 This issue only affects the ACX5448 Series and ACX710 Series routers. No other products or platforms are affected by this vulnerability. This issue affects Juniper Networks Junos OS: o 18.2 versions prior to 18.2R3-S8 on ACX5448; o 18.3 versions prior to 18.3R3-S5 on ACX5448; o 18.4 versions prior to 18.4R1-S6, 18.4R3-S7 on ACX5448; o 19.1 versions prior to 19.1R3-S5 on ACX5448; o 19.2 versions prior to 19.2R2, 19.2R3 on ACX5448; o 19.3 versions prior to 19.3R3 on ACX5448; o 19.4 versions prior to 19.4R3 on ACX5448; o 20.1 versions prior to 20.1R2 on ACX5448; o 20.2 versions prior to 20.2R2 on ACX5448 and ACX710. 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-2021-0216 . Solution: The following software releases have been updated to resolve this specific issue: Junos OS 18.2R3-S8, 18.3R3-S5, 18.4R1-S6, 18.4R3-S7, 19.1R3-S5, 19.2R2, 19.2R3, 19.3R3, 19.4R3, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases. This issue is being tracked as 1477261 . Workaround: There are no viable workarounds for this issue. 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. 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If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYHewR+NLKJtyKPYoAQgmvQ//So99WGBVQeuf+IKW+xrJeJPz/hkN/oEB Vk7qmw3LlNFyfpxG2qEpmdZrLYmnTKw/NUwJ0BBzfjTHhQVUr4hnBaD9GBWqqPTE XAZk8CBqb4QOIayTWjYuEGeHJjLJXGFgWPi7UmfP2Lo4kflBDXU+cT5qBxbfjxQh mi8xT5AaiLl8Bdmp8/n85vJAq/M2oTaWCfn4PScYqphBQQ7pPPaSoaHCAY8B4DBG LlUQF1yLXuL7lip4l9Wd6nu9Qr8MBARVzRTrThWBc9WvCylgjfRVG8xg3P+2SYPd lDvCM6wHFfbhCshIH3OinvHuVSjqSvNkKYn+uzBZUuhhDStZv5hrfz1dAeTEBCC+ lVysMfZ68Wmlp/kZi717Guu2cVVoCaq6qoJ4gPbBd0zJ3WbXKDRSTeFlog4x99LP +wgxUoXmgs8yNYHksvUkvI4UeEvYOGAbknW42BE9JcbXdM1DdXhaOYRVU6EZGk1g 5PTaqEWTrqh/2anzCVE7sWAOWSDnhsd0n4cH6d7X8egLIReDPCLD2ziQuOwdJQ7r 88zG7liBK/suf6eJAjrXuvdZhiHhMGEXOp4k2lcgNeBFKmZQsvUofurfZ/v5EtVD t9pwC2aEq4xiumiKMwouNaiE43ce8Mv9Lz/Hf38qCFijvDM3Rx5VnLHuWCdQw/cv QOXe1LtN0gw= =uibt -----END PGP SIGNATURE-----