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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1259 JSA11119 - 2021-04 Security Bulletin: Junos OS: ANCPD core when hitting maximum-discovery-table-entries limit 15 April 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Junos OS: ANCPD core Publisher: Juniper Networks Operating System: Juniper Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-0224 Original Bulletin: http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11119 - --------------------------BEGIN INCLUDED TEXT-------------------- 2021-04 Security Bulletin: Junos OS: ANCPD core when hitting maximum-discovery-table-entries limit (CVE-2021-0224) Article ID : JSA11119 Last Updated: 14 Apr 2021 Version : 1.0 Product Affected: This issue affects Junos OS all versions prior to 17.3R3-S12, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3. Problem: A vulnerability in the handling of internal resources necessary to bring up a large number of Layer 2 broadband remote access subscriber (BRAS) nodes in Juniper Networks Junos OS can cause the Access Node Control Protocol daemon (ANCPD) to crash and restart, leading to a Denial of Service (DoS) condition. Continued processing of spoofed subscriber nodes will create a sustained Denial of Service (DoS) condition. When the number of subscribers attempting to connect exceeds the configured maximum-discovery-table-entries value, the subscriber fails to map to an internal neighbor entry, causing the ANCPD process to crash. This issue affects Juniper Networks Junos OS: o 17.3 versions prior to 17.3R3-S12; o 17.4 versions prior to 17.4R2-S13; o 18.1 versions prior to 18.1R3-S13; o 18.2 versions prior to 18.2R3-S8; o 18.3 versions prior to 18.3R3-S5; o 18.4 versions prior to 18.4R1-S8, 18.4R3-S8; o 19.1 versions prior to 19.1R3-S4; o 19.2 versions prior to 19.2R3-S2; o 19.3 versions prior to 19.3R3-S1; o 19.4 versions prior to 19.4R3-S1; o 20.1 versions prior to 20.1R2; o 20.2 versions prior to 20.2R2; o 20.3 versions prior to 20.3R2. Configurations that may be vulnerable to this issue are those where a maximum number of discovery table entries are configured. For example: [protocols ancp maximum-discovery-table-entries] 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-2021-0224 . Solution: The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R2-S13, 18.2R3-S8, 18.4R1-S8, 18.4R3-S8, 19.1R3-S4, 19.2R3-S2, 19.3R3-S1, 19.4R3-S1, 20.1R2, 20.1R3, 20.2R2, 20.2R3, 20.3R2, 20.4R1, and all subsequent releases. This issue is being tracked as 1544746 . 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. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. 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 iQIVAwUBYHewUeNLKJtyKPYoAQgQcQ//ZxaAkgi7Jt/Egmai1i6vGi/bBWwbV1ig 68EZgZ4BQfehMbcnklctoVyHGnx+QBqGFR01Bms5TAMaCcLg7La6kkJkIx8yrf3E lk0JxvQtVJ4KaWXzIoEHiqH7JskRWjfbGYh8qSsTPde6j94LEteOoSPmex+7RbWm z7IzeQ4Vi5OA0Qvvso6ZV1GgPirlxHsLjHVPIFbQZkoNEpvgiEIH3kEBLZUqLm9I SV/EXYeSMah1fEFvuAQ0XSq0uFDyQyKehNbe89Sx9jGx1oJjEhq1QYYIJE7TDvD0 3/lOOu88dNCM2i6WGA57Cb8yN0/ToFy5KY+QxLJPMtqeK/3w95G7w4gzyiSlKSiH rx1CAO0FI8kjYEoyDApqRHKGjNeJ7bgf+jTBrp/TLyXCVntgvJLN+DzhYGjo156G TJxW1pcUNaYlGMfL7pgBTPizh+bFYameNxlSO9GzCj6wd0ZQK2lQbTajYBTy+eQ6 VXubpAWSWWuJr9F0actxgIcWiZqEuwiEU0jINK9jHv+HirmLMq9O/4PtfNzi6zu7 Ifrdlx2gzlPBrfJOqizQkI91sQf6TYMiD+qetbZxbqC0NLJzGj17xOa1KfC0s1vK LSJv3GKMZD3h5lQQKAgdCDucEdQmmYeTIM0YhmwvCc00+Zlbcc8vt3GiT9eltXOC P4DU/0M3T6k= =rASg -----END PGP SIGNATURE-----