CVE-2021-31383 : Security Advisory and Response
Discover the impact of CVE-2021-31383, a vulnerability in Juniper Networks Junos OS and Junos OS Evolved, enabling a remote attacker to trigger a Denial of Service condition.
A vulnerability in Juniper Networks Junos OS and Junos OS Evolved could allow a remote attacker to cause a Denial of Service (DoS) condition by sending crafted packets, affecting certain versions of the software.
Understanding CVE-2021-31383
This CVE highlights an issue in Point to MultiPoint (P2MP) scenarios within Junos OS and Junos OS Evolved where the improper handling of specific packets can lead to a Stack-based Buffer Overflow, crashing the routing protocol daemon.
What is CVE-2021-31383?
The vulnerability stems from an incorrect source to destination copy write operation, exploited by a remote unauthenticated network attacker to trigger a DoS, impacting specific versions of Juniper Networks Junos OS and Junos OS Evolved.
The Impact of CVE-2021-31383
The vulnerability can lead to a sustained DoS condition, disrupting network operations and causing the affected RPD to crash, affecting the availability of the system.
Technical Details of CVE-2021-31383
The vulnerability has a CVSS base score of 7.5, indicating a high severity issue with low attack complexity and network vector.
Vulnerability Description
The vulnerability arises from the mishandling of certain packets by the routing protocol daemon, potentially leading to a DoS condition.
Affected Systems and Versions
Specific versions of Juniper Networks Junos OS and Junos OS Evolved are impacted, ranging from 19.2 to 20.3 and 20.1 to 20.3 respectively.
Exploitation Mechanism
A remote unauthenticated attacker can exploit the vulnerability by sending crafted packets, triggering the Stack-based Buffer Overflow and crashing the RPD.
Mitigation and Prevention
It is crucial to take immediate steps to address the vulnerability and prevent potential exploitation.
Immediate Steps to Take
Juniper Networks recommends updating to the latest software releases to mitigate the vulnerability.
Long-Term Security Practices
Regularly update and patch Junos OS and Junos OS Evolved to guard against known vulnerabilities and enhance system security.
Patching and Updates
The latest software releases including versions 19.2R3-S2, 19.4R3-S3, 20.2R2-S3, and 20.4R1 address the CVE-2021-31383 vulnerability to ensure system integrity.