CVE-2021-31385 : What You Need to Know
Discover details of CVE-2021-31385, a path traversal vulnerability in Juniper Networks Junos OS J-Web allowing privilege escalation. Learn about impacted versions and necessary mitigations.
A path traversal vulnerability in J-Web of Juniper Networks Junos OS has been identified as CVE-2021-31385, allowing low-privileged authenticated attackers to elevate their privileges to root. This CVE impacts various versions of Junos OS prior to specific releases.
Understanding CVE-2021-31385
This section provides a detailed insight into the vulnerability and its implications.
What is CVE-2021-31385?
An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in J-Web of Juniper Networks Junos OS allows any low-privileged authenticated attacker to elevate their privileges to root.
The Impact of CVE-2021-31385
The vulnerability's impact includes a high base score of 8.8, with confidentiality, integrity, and availability being affected.
Technical Details of CVE-2021-31385
Here, we delve into the technical aspects of the CVE to understand its nature and implications.
Vulnerability Description
The vulnerability arises due to improper limitation of a pathname, leading to path traversal and privilege escalation.
Affected Systems and Versions
This issue affects various versions of Junos OS including 12.3, 15.1, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, and 21.1.
Exploitation Mechanism
While the vulnerability exists, Juniper SIRT has not detected any malicious exploitation activities related to this issue.
Mitigation and Prevention
To address CVE-2021-31385 and enhance security measures, the following steps are recommended.
Immediate Steps to Take
It is advised to update the Junos OS to the patched versions to mitigate the vulnerability. Immediate action is crucial to prevent unauthorized privilege escalation.
Long-Term Security Practices
Implement access lists or firewall filters to restrict access to trusted administrative networks, hosts, and users, minimizing the risk of exploitation.
Patching and Updates
Ensure all affected systems are updated to the following software releases to address the specific issue: 12.3R12-S19, 15.1R7-S10, 18.3R3-S5, 18.4R3-S9, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 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, and all subsequent releases.