CVE-2021-0231 Explained : Impact and Mitigation

A path traversal vulnerability in the Juniper Networks SRX and vSRX Series may allow an authenticated J-web user to read sensitive system files. This vulnerability affects Junos OS on SRX and vSRX Series versions 19.3, 19.4, 20.1, and 20.2.

Understanding CVE-2021-0231

This CVE identifies a path traversal vulnerability in Juniper Networks SRX and vSRX Series, potentially leading to information disclosure.

What is CVE-2021-0231?

CVE-2021-0231 is a path traversal vulnerability in Juniper Networks SRX and vSRX Series that could be exploited by an authenticated J-web user to access sensitive system files.

The Impact of CVE-2021-0231

The vulnerability poses a medium severity risk, with high confidentiality impact but low privileges required for exploitation.

Technical Details of CVE-2021-0231

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability allows a J-web user to read sensitive system files, potentially leading to the exposure of critical information.

Affected Systems and Versions

Junos OS on SRX and vSRX Series versions 19.3, 19.4, 20.1, and 20.2 are affected by this vulnerability.

Exploitation Mechanism

An authenticated J-web user could exploit this vulnerability to traverse system paths and access restricted files.

Mitigation and Prevention

To address CVE-2021-0231, follow the mitigation and prevention strategies below.

Immediate Steps to Take

There are no viable workarounds available. Limit access by using access lists or firewall filters to trusted networks, hosts, and users.

Long-Term Security Practices

Regularly update Junos OS to the latest patched versions to prevent exploitation and enhance system security.

Patching and Updates

Upgrade to the following software releases: 19.3R2-S6, 19.3R3-S1, 19.4R2-S4, 19.4R3, 20.1R1-S4, 20.1R2, 20.2R1-S3, 20.2R2, 20.3R1, and subsequent releases.