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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3747 Junos OS: EX4300 Series: High CPU load due to receipt of specific IPv4 packets (CVE-2020-1670) 30 October 2020 =========================================================================== 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-2020-1670 Original Bulletin: http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11067&actp=RSS - --------------------------BEGIN INCLUDED TEXT-------------------- JSA11067 - 2020-10 Security Bulletin: Junos OS: EX4300 Series: High CPU load due to receipt of specific IPv4 packets (CVE-2020-1670) PRODUCT AFFECTED: This issue affects Junos OS 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1. Affected platforms: EX4300 series. PROBLEM: On Juniper Networks EX4300 Series, receipt of a stream of specific IPv4 packets can cause Routing Engine (RE) high CPU load, which could lead to network protocol operation issue and traffic interruption. This specific packets can originate only from within the broadcast domain where the device is connected. This issue occurs when the packets enter to the IRB interface. Only IPv4 packets can trigger this issue. IPv6 packets cannot trigger this issue. This issue affects Juniper Networks Junos OS on EX4300 series: 17.3 versions prior to 17.3R3-S9; 17.4 versions prior to 17.4R2-S11, 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R3-S4; 18.3 versions prior to 18.3R2-S4, 18.3R3-S2; 18.4 versions prior to 18.4R2-S4, 18.4R3-S2; 19.1 versions prior to 19.1R2-S2, 19.1R3-S1; 19.2 versions prior to 19.2R1-S5, 19.2R2-S1, 19.2R3; 19.3 versions prior to 19.3R2-S4, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2; 20.1 versions prior to 20.1R1-S3, 20.1R2. The example of the configuration stanza affected by this issue is as follows: [interfaces irb unit <UNIT_NUMBER>] 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-2020-1670. SOLUTION: The following software releases have been updated to resolve this specific issue: 17.3R3-S9, 17.4R2-S11, 17.4R3-S2, 18.1R3-S10, 18.2R3-S4, 18.3R2-S4, 18.3R3-S2, 18.4R2-S4, 18.4R3-S2, 19.1R2-S2, 19.1R3-S1, 19.2R1-S5, 19.2R2-S1, 19.2R3, 19.3R2-S4, 19.3R3, 19.4R1-S3, 19.4R2, 20.1R1-S3, 20.1R2, 20.2R1 and all subsequent releases. This issue is being tracked as 1495129. WORKAROUND: There are no viable workarounds for this issue. IMPLEMENTATION: Software releases or updates are available for download at https://www.juniper.net/support/downloads/. MODIFICATION HISTORY: 2020-10-14: 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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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 iQIVAwUBX5tUNONLKJtyKPYoAQiyBw//eyxb6nTB48mMGVofSTUfwxrIeEossTSe k+hEe56fDhJkLdhfIPWIzMnQ5ATYdp9ugzPPEyd1KbNs8ZFbO6GAEg7sqcS1jVMI 3gxnruxgoNVYZWWWqW2mwXVIKVqH6JNpHvjiHm34oDlvpmnMlDmZPBcS312cvio4 b+H+/Rout0twNzD8M4p890lO/g73d7zrCRNchNkgCNoTJRhFjHE2zR5bKkuVBEmF DgMIjKMoNcqNzpwHm5euqMnbpqTzh8mRXQX1e2eG2LVoC5RGdQyJzVrxUZGBe9B3 FrUij21Ir1ZpXThfDJnf5b2OpBpbrW660VAWXcvXtOKSoBrkDxYkNsBGy5alHHAw QbIYIGO3kcGSnw9TiWqlU2QCiuO35BHEZOsyJgaSRaBE30P1CQ1mW+vpR7riPPwy DWIr/Yv7DOS/81aUlIdbDcKACEE/EFySXz0oAmqmd7n2BnZpVgQtWAMBaBOxGrNO odGoX9k/YIltWTAHQe4n22nJkh3pi21uz7Pw0/LEvytI1UzZO0PKwGnt7Rv+Pcy6 EIoz6YTxIqhqVOx6bRqHYFf+9sYpU69sN37JdbSWTQ5xCAxroaYJQZQyyT0pLh3u uAQpJHgZHKwew+DFw4MQMxiyZbQ8af9P6MvAZzLFmhx175p63xl6e4Ooemf71xwn uqrnRBazWGQ= =mNzN -----END PGP SIGNATURE-----