Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3423 JSA11216 - 2021-10 Security Bulletin: Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset (CVE-2021-31351) 15 October 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Junos OS Publisher: Juniper Networks Operating System: Juniper Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-31351 Original Bulletin: http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11216 - --------------------------BEGIN INCLUDED TEXT-------------------- 2021-10 Security Bulletin: Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset (CVE-2021-31351) Article ID : JSA11216 Last Updated: 14 Oct 2021 Version : 2.0 Product Affected: This issue affects specific versions of Junos OS (see below). Affected platforms: MX Series. Problem: An Improper Check for Unusual or Exceptional Conditions in packet processing on the MS-MPC/MS-MIC utilized by Juniper Networks Junos OS allows a malicious attacker to send a specific packet, triggering the MS-MPC/MS-MIC to reset, causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects specific versions of Juniper Networks Junos OS on MX Series: o 17.3R3-S11; o 17.4R2-S13; o 17.4R3 prior to 17.4R3-S5; o 18.1R3-S12; o 18.2R2-S8, 18.2R3-S7, 18.2R3-S8; o 18.3R3-S4; o 18.4R3-S7; o 19.1R3-S4, 19.1R3-S5; o 19.2R1-S6; o 19.3R3-S2; o 19.4R2-S4, 19.4R2-S5; o 19.4R3-S2; o 20.1R2-S1; o 20.2R2-S2, 20.2R2-S3, 20.2R3; o 20.3R2, 20.3R2-S1; o 20.4R1, 20.4R1-S1, 20.4R2; o 21.1R1; This issue does not affect any version of Juniper Networks Junos OS prior to 15.1; 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-2021-31351 . Solution: The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R3-S8, 19.1R3-S6, 19.2R1-S7, 19.2R3-S2, 19.3R2-S6, 19.3R3-S3, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R3-S1, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases. Note: Only those releases listed in the PROBLEM section above are affected. This fix has also been proactively committed into other releases that are not vulnerable to this issue. This issue is being tracked as 1577814 . 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: 2021-10-13: Initial Publication. 2021-10-14: Typo in affected releases (20.2R3-S3 -> 20.2R2-S3) CVSS Score: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Severity Level: High 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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. 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 iQIVAwUBYWjsjONLKJtyKPYoAQiCKg//f80L8/2iZP7CCSu+k1o2l8k1ij4AsvL+ tKzVMXKZvrRfqnjqaKCDNo89BlUoGmTwhZx68+hjX0bMUpfH1u27sclXYqszvouI Jdol9V3diCQ8aZ64/jaTS2zTPltZWRNrX6ecBvjaocCtLW6I30gfGbyJkCmn64MM wUSTjRjh6F2NOUurTtUruioxWWf6Txi0FYoJyruAmj9P5omHlJCb9d6FNDcqcq8r J8QjtmRWg2GExJRnsMZP2KVOPzQCFq+gCGkywT9wPqDwqQYe+b6ozR0YVPg4aN+w WxxuXbN184NgWcKyawSqMvLnxAdXyU8/GRaLsYqmDHpLBTztLRWhhYsWYzmBUUhY Mi9eft+fFaHtAyr8Cm04Bgcwyvz/xWAYJh/3x6P1tdA6QJqt4InTTXkg1DBNH68a /tBgesOBS/kbkejkNUSrnFltfCoWzhjGhwj9JA7CUJOmo1RGAF7gnVpb4yx3p0bg gvh/Ar4dO0zhyRd9SVHBbkAgAF2w/AZ5WywWFyJDTRPbFT/sV9H1lusMSwAaNDKT AjEgrzk/WoAGIE2sQ1N0LnpV148Y2tBjWSHygzwlTKjj+RfwxEptldpK35+pd3PD UuKn2DSMYY87H5uTpXtE1tV/F5ChELK0ZGUs/oRDcpeWaDYMOBsBzggzi6DpnNwF NCq4HbeAc+g= =sfAe -----END PGP SIGNATURE-----