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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2435.3 JSA11200 - 2021-07 Security Bulletin: Junos OS: Upon receipt of specific sequences of genuine packets destined to the device the kernel will crash and restart (vmcore) (CVE-2021-0283, CVE-2021-0284) 28 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-2021-0284 CVE-2021-0283 Reference: ESB-2021.2435.2 Original Bulletin: http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11200 Revision History: October 28 2021: Added additional versions to CVE-2021-0283, CVE-2021-0284, updated CVE detail text, product affected, problem and solution August 18 2021: Added additional versions to CVE-2021-0283, CVE-2021-0284, updated CVE detail text, product affected, problem and solution sections to reflect these changes along with minor typographical edits. July 20 2021: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- 2021-07 Security Bulletin: Junos OS: Upon receipt of specific sequences of genuine packets destined to the device the kernel will crash and restart (vmcore) (CVE-2021-0283, CVE-2021-0284) Article ID : JSA11200 Last Updated: 27 Oct 2021 Version : 8.0 Product Affected: This issue affects Junos OS 12.3, 15.1, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, 21.1, 21.2. Problem: A buffer overflow vulnerability in the TCP/IP stack of Juniper Networks Junos OS allows an attacker to send specific sequences of packets to the device thereby causing a Denial of Service (DoS). By repeatedly sending these sequences of packets to the device, an attacker can sustain the Denial of Service (DoS) condition. The device will abnormally shut down as a result of these sent packets. A potential indicator of compromise will be the following message in the log files: eventd[13955]: SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut down These issues are only triggered by traffic destined to the device. Transit traffic will not trigger these issues. CVE-2021-0283 affects: Juniper Networks Junos OS o 12.3 versions prior to 12.3R12-S19; o 15.1 versions prior to 15.1R7-S10; o 16.1 version 16.1R1 and later versions; o 16.2 version 16.2R1 and later versions; o 17.1 version 17.1R1 and later versions; o 17.2 version 17.2R1 and later versions; o 17.3 versions prior to 17.3R3-S12; o 17.4 version 17.4R1 and later versions; o 18.1 versions prior to 18.1R3-S13; o 18.2 version 18.2R1 and later versions; o 18.3 versions prior to 18.3R3-S5; o 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; o 19.1 versions prior to 19.1R3-S6; o 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; o 19.3 versions prior to 19.3R2-S7, 19.3R3-S3; o 19.4 versions prior to 19.4R3-S5; o 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; o 20.2 versions prior to 20.2R3-S2; o 20.3 versions prior to 20.3R3; o 20.4 versions prior to 20.4R2-S1, 20.4R3; o 21.1 versions prior to 21.1R1-S1, 21.1R2; o 21.2 versions prior to 21.2R1-S1, 21.2R2. CVE-2021-0284 affects: Juniper Networks Junos OS o 12.3 versions prior to 12.3R12-S19; o 15.1 versions prior to 15.1R7-S10; o 17.3 versions prior to 17.3R3-S12; o 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; o 19.1 versions prior to 19.1R3-S7; o 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; o 19.3 versions prior to 19.3R2-S7, 19.3R3-S3; o 19.4 versions prior to 19.4R3-S5; o 20.1 versions prior to 20.1R3-S1; o 20.2 versions prior to 20.2R3-S2; o 20.3 versions prior to 20.3R3-S1; o 20.4 versions prior to 20.4R2-S2, 20.4R3; o 21.1 versions prior to 21.1R2; o 21.2 versions prior to 21.2R1-S1, 21.2R2. CVE-2021-0283 was seen during production usage. CVE-2021-0284 was found during internal product security testing or research. Juniper SIRT is not aware of any malicious exploitation of either CVE-2021-0283 or CVE-2021-0284 vulnerabilities. Juniper SIRT is aware of CVE-2021-0283 occurring in production. In all reported cases the Junos device was not the intended target of the attack, but this vulnerability was still triggered. This issue was seen during production usage. CVE CVSS Summary A buffer overflow vulnerability in the TCP/IP stack of Juniper Networks Junos OS allows an attacker to send specific sequences of packets to the device thereby causing a Denial of Service (DoS). By 7.5 ( repeatedly sending these sequences of packets to the CVSS:3.1/ device, an attacker can sustain the Denial of Service CVE-2021-0283 AV:N/AC:L/ (DoS) condition. The device will abnormally shut down PR:N/UI:N/ as a result of these sent packets. A potential S:U/C:N/I:N indicator of compromise will be the following message /A:H) in the log files: "eventd[13955]: SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut down" This issue is only triggered by traffic destined to the device. Transit traffic will not trigger this issue. A buffer overflow vulnerability in the TCP/IP stack of Juniper Networks Junos OS allows an attacker to send specific sequences of packets to the device thereby causing a Denial of Service (DoS). By 7.5 ( repeatedly sending these sequences of packets to the CVSS:3.1/ device, an attacker can sustain the Denial of Service CVE-2021-0284 AV:N/AC:L/ (DoS) condition. The device will abnormally shut down PR:N/UI:N/ as a result of these sent packets. A potential S:U/C:N/I:N indicator of compromise will be the following message /A:H) in the log files: "eventd[13955]: SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut down" This issue is only triggered by traffic destined to the device. Transit traffic will not trigger this issue. Solution: The following software releases have been updated to resolve both issues: Junos OS: 12.3R12-S19, 15.1R7-S10, 17.3R3-S12, 18.4R2-S9, 18.4R3-S9, 19.1R3-S7, 19.2R1-S7, 19.2R3-S3, 19.3R2-S7, 19.3R3-S3, 19.4R3-S5, 20.1R3-S1, 20.2R3-S2, 20.3R3-S1, 20.4R2-S2, 20.4R3, 21.1R2, 21.2R1-S1, 21.2R2, 21.3R1, and all subsequent releases. The following software releases have been updated to resolve CVE-2021-0283: Junos OS: 12.3R12-S19, 15.1R7-S10, 17.3R3-S12, 18.1R3-S13, 18.3R3-S5, 18.4R2-S9, 18.4R3-S9, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S7, 19.3R3-S3, 19.4R3-S5, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1-S1, 21.2R2, 21.3R1, and all subsequent releases. The following software releases have been updated to resolve CVE-2021-0284: Junos OS: 12.3R12-S19, 15.1R7-S10, 17.3R3-S12, 18.4R2-S9, 18.4R3-S9, 19.1R3-S7, 19.2R1-S7, 19.2R3-S3, 19.3R2-S7, 19.3R3-S3, 19.4R3-S5, 20.1R3-S1, 20.2R3-S2, 20.3R3-S1, 20.4R2-S2, 20.4R3, 21.1R2, 21.2R1-S1, 21.2R2, 21.3R1, and all subsequent releases. These issues are being tracked as 1557881 and 1595649 . Workaround: There are no available workarounds for these issues. To reduce the risk of exploitation of these issues, use access lists or firewall filters to limit access to the device to only trusted administrative networks, hosts and users. Implementation: Software releases or updates are available for download at https:// support.juniper.net/support/downloads/ Modification History: 2021-07-14: Initial Publication. 2021-07-21: Added additional versions to CVE-2021-0284 list in affected ranges and resolved-in. 2021-08-02: Added additional versions to CVE-2021-0284 list in affected ranges and resolved-in. 2021-08-17: Added additional versions to CVE-2021-0283, CVE-2021-0284, updated CVE detail text, product affected, problem and solution sections to reflect these changes along with minor typographical edits. 2021-10-27: Added additional versions to CVE-2021-0283, CVE-2021-0284. 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. 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