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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3571 2020-10 Security Bulletin: Junos OS: jdhcpd process crash when forwarding a malformed DHCP packet. (CVE-2020-1661) 16 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-2020-1661 Original Bulletin: https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11056&actp=RSS - --------------------------BEGIN INCLUDED TEXT-------------------- 2020-10 Security Bulletin: Junos OS: jdhcpd process crash when forwarding a malformed DHCP packet. (CVE-2020-1661) Article ID: JSA11056 Last Updated: 14 Oct 2020 Version: 1.0 Product Affected: This issue affects Junos OS 12.3, 12.3X48, 14.1X53, 15.1, 15.1X49, 15.1X53, 16.1. Problem: On Juniper Networks Junos OS devices configured as a DHCP forwarder, the Juniper Networks Dynamic Host Configuration Protocol Daemon (jdhcp) process might crash when receiving a malformed DHCP packet. This issue only affects devices configured as DHCP forwarder with forward-only option, that forward specified DHCP client packets, without creating a new subscriber session. The jdhcpd daemon automatically restarts without intervention, but continuous receipt of the malformed DHCP packet will repeatedly crash jdhcpd, leading to an extended Denial of Service (DoS) condition. This issue can be triggered only by DHCPv4, it cannot be triggered by DHCPv6. This issue affects Juniper Networks Junos OS: 12.3 versions prior to 12.3R12-S16; 12.3X48 versions prior to 12.3X48-D105 on SRX Series; 14.1X53 versions prior to 14.1X53-D60 on EX and QFX Series; 15.1 versions prior to 15.1R7-S7; 15.1X49 versions prior to 15.1X49-D221, 15.1X49-D230 on SRX Series; 15.1X53 versions prior to 15.1X53-D593 on EX2300/EX3400; 16.1 versions prior to 16.1R7-S5. The examples of the config stanza affected by this issue: [forwarding-options dhcp-relay forward-only] 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-2020-1661. Solution: The following software releases have been updated to resolve this specific issue: Junos OS 12.3R12-S16, 12.3X48-D105, 15.1R7-S7, 15.1X49-D221, 15.1X49-D230, 15.1X53-D593, 16.1R7-S5, 16.2R1 and all subsequent releases. This issue is being tracked as 1430874. 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: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) 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 iQIVAwUBX4kM++NLKJtyKPYoAQh9hQ/+NttxZyf7Cz6Edf4SgraDrMPXMmcbJnfO ySkMIEBAspXRJiOkTkH5GkVzwZgljmKVToMTLMvSoB+MX2lP0khWufwheYy0lFJD DyZaPw+4InE30MdDvZDesC9ogdsblKh5c/+GMFHl16BS89wZ62ip4T9neSbYjbVn wv9cAf1qPnI0X7wO/CG/QaMB5rwkQTx3D+sVrP4+uyiMObaGrFz9jMECwa71x7/T x+WtKZeHL6TJE0PgXaIscpeA4fG0j+x/QgcUYocmq4V7ZdJ3YOMlGFwLqpEF0S2L 07ZFGi6uFuj2jAiDimsNUvKkVOPMX1frap/OInNKWjyIJfpApthJ9nu1KfmNPYEd ZziWSgXovh3bkzDJJhfVg1Y/s4+QoJYyefXl0MjF15SlhJMigewNNrqQJ4nCSsRH F06+8V2RqMDfGNoIbzACChspvHVbS4zpa79SFY0koFoLQ0e9V07k1ggssBTmL1ZJ C0QCS6w1L2fQwh8S697mZDzepcBmjXVsg7kyNsgwVIC7OIMJqppD0Nv+GYxxJ1w6 qTKeew+xMFx1lI/uP98jOf6Q6xXjwXXDNbspkmUAL5yPm8hKcJKdpIieaTTifzS3 tRrqjtRxhzviZrYJsuG6Og+3FBb/O/mupnWSTtuz++WaadLorwC1LAiJGlP5TG5u y4IRyEJpdv8= =M83T -----END PGP SIGNATURE-----