CVE-2021-0282 : Vulnerability Insights and Analysis
Discover in-depth insights about CVE-2021-0282, a critical vulnerability in Junos OS leading to a Denial of Service (DoS) condition and learn how to mitigate the risk effectively.
In this article, we will dive into the details of CVE-2021-0282, a vulnerability in Junos OS that can lead to a Denial of Service (DoS) condition due to a crash in the routing process daemon (RPD) when processing a specific BGP UPDATE message with Multipath or add-path features enabled.
Understanding CVE-2021-0282
This section provides insights into the nature and impact of the CVE-2021-0282 vulnerability.
What is CVE-2021-0282?
CVE-2021-0282 is a vulnerability found in Juniper Networks Junos OS devices with Multipath or add-path feature enabled. Processing a specific BGP UPDATE message can cause the RPD to crash and restart, leading to a Denial of Service (DoS) condition.
The Impact of CVE-2021-0282
The vulnerability affects both IBGP and EBGP deployments in IPv4 or IPv6 networks. Devices without the BGP Multipath or add-path feature enabled are not impacted. Continued receipt and processing of the malicious UPDATE message can result in a sustained DoS condition.
Technical Details of CVE-2021-0282
This section delves deeper into the technical aspects of the CVE-2021-0282 vulnerability.
Vulnerability Description
Junos OS devices with the Multipath or add-path feature enabled are susceptible to a crash in RPD when processing a specific BGP UPDATE message, resulting in a DoS situation.
Affected Systems and Versions
Juniper Networks Junos OS versions 12.3 to 19.1 are affected by this vulnerability if the Multipath or add-path feature is enabled.
Exploitation Mechanism
As per Juniper SIRT, there is no known malicious exploitation of this vulnerability at the time of disclosure.
Mitigation and Prevention
This section outlines the steps to mitigate and prevent exploitation of CVE-2021-0282.
Immediate Steps to Take
Disabling the BGP Multipath or add-path features can help mitigate the risk posed by this vulnerability.
Long-Term Security Practices
Regularly updating Junos OS to the patched versions is crucial to prevent exploitation of this vulnerability.
Patching and Updates
Juniper has released updated software versions (12.3R12-S18, 15.1R7-S9, 17.3R3-S11, 17.4R2-S13, 17.4R3-S4, 18.1R3-S12, 18.2R3-S7, 18.3R3-S4, 18.4R2-S6, 18.4R3-S6, 19.1R3-S3, 19.2R1, and subsequent releases) to address the vulnerability.