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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3562 JSA11049 - 2020-10 Security Bulletin: Junos OS: When a DHCPv6 Relay-Agent is configured upon receipt of a specific DHCPv6 client message, Remote Code Execution may occur. (CVE-2020-1656) 16 October 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Junos OS Publisher: Juniper Networks Operating System: Juniper Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-1656 Original Bulletin: http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11049 - --------------------------BEGIN INCLUDED TEXT-------------------- 2020-10 Security Bulletin: Junos OS: When a DHCPv6 Relay-Agent is configured upon receipt of a specific DHCPv6 client message, Remote Code Execution may occur. (CVE-2020-1656) Article ID : JSA11049 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, 16.2, 17.1, 17.2, 17.2X75, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3, 18.4, 19.1, 19.2, 19.3. Problem: The DHCPv6 Relay-Agent service, part of the Juniper Enhanced jdhcpd daemon shipped with Juniper Networks Junos OS has an Improper Input Validation vulnerability which will result in a Denial of Service (DoS) condition when a DHCPv6 client sends a specific DHPCv6 message allowing an attacker to potentially perform a Remote Code Execution (RCE) attack on the target device. Continuous receipt of the specific DHCPv6 client message will result in an extended Denial of Service (DoS) condition. If adjacent devices are also configured to relay DHCP packets, and are not affected by this issue and simply transparently forward unprocessed client DHCPv6 messages, then the attack vector can be a Network-based attack, instead of an Adjacent-device attack. No other DHCP services are affected. Receipt of the packet without configuration of the DHCPv6 Relay-Agent service, will not result in exploitability of this issue. This issue affects Juniper Networks Junos OS: o 12.3 versions prior to 12.3R12-S15; o 12.3X48 versions prior to 12.3X48-D95; o 14.1X53 versions prior to 14.1X53-D53; o 15.1 versions prior to 15.1R7-S6; o 15.1X49 versions prior to 15.1X49-D200; o 15.1X53 versions prior to 15.1X53-D593; o 16.1 versions prior to 16.1R7-S7; o 16.2 versions prior to 16.2R2-S11; o 17.1 versions prior to 17.1R2-S11, 17.1R3-S2; o 17.2 versions prior to 17.2R3-S3; o 17.2X75 versions prior to 17.2X75-D44; o 17.3 versions prior to 17.3R3-S7; o 17.4 versions prior to 17.4R2-S9, 17.4R3; o 18.1 versions prior to 18.1R3-S9; o 18.2 versions prior to 18.2R2-S6, 18.2R3-S2; o 18.2X75 versions prior to 18.2X75-D12, 18.2X75-D33, 18.2X75-D435, 18.2X75-D60; o 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3-S1; o 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R3; o 19.1 versions prior to 19.1R1-S4, 19.1R2; o 19.2 versions prior to 19.2R1-S3, 19.2R2; o 19.3 versions prior to 19.3R2. The following minimal configuration is required: [forwarding-options dhcp-relay dhcpv6] More details on DHCPV6 Relay-Agent configuration and use are located in the reference URLs. 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-2020-1656 . Solution: The following software releases have been updated to resolve this specific issue: Junos OS 12.3R12-S15, 12.3X48-D100, 12.3X48-D95, 14.1X53-D53, 15.1R7-S6, 15.1X49-D200, 15.1X53-D593, 16.1R7-S7, 16.2R2-S11, 17.1R2-S11, 17.1R3-S2, 17.2R3-S3, 17.2X75-D44, 17.3R3-S7, 17.4R2-S9, 17.4R3, 18.1R3-S9, 18.2R2-S6, 18.2R3-S2, 18.2X75-D12, 18.2X75-D33, 18.2X75-D435, 18.2X75-D60, 18.3R1-S7, 18.3R2-S3, 18.3R3-S1, 18.4R1-S5, 18.4R2-S3, 18.4R3, 19.1R1-S4, 19.1R2, 19.1R3, 19.2R1-S3, 19.2R2, 19.4R1, and all subsequent releases. This issue is being tracked as 1461448 . Workaround: There are no available 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: 8.8 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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. 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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). 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