CVE-2021-0275 : What You Need to Know

A Cross-site Scripting (XSS) vulnerability in J-Web on Juniper Networks Junos OS allows an attacker to target another user's session, potentially gaining access to the user's session and privileges. This vulnerability affects multiple versions of Junos OS across different Juniper Networks platforms.

Understanding CVE-2021-0275

This CVE highlights a security flaw in J-Web on Juniper Networks Junos OS that could be exploited by an attacker to manipulate another user's session.

What is CVE-2021-0275?

The CVE-2021-0275 vulnerability is related to Cross-site Scripting (XSS) in Juniper Networks Junos OS, allowing unauthorized access to another user's session and potentially leading to full control of the affected device.

The Impact of CVE-2021-0275

If successfully exploited, the attacker could gain the same privileges as the user, with the possibility of attaining complete control over the device.

Technical Details of CVE-2021-0275

This section covers the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The XSS vulnerability in J-Web on Juniper Networks Junos OS enables attackers to target active user sessions, potentially compromising device security.

Affected Systems and Versions

Multiple versions of Junos OS on platforms like EX Series and SRX Series are affected, ranging from 12.3 to 19.3.

Exploitation Mechanism

Successful exploitation requires an active user session, after which the attacker can escalate privileges and potentially take over the device.

Mitigation and Prevention

To address CVE-2021-0275, immediate steps should be taken along with long-term security practices and timely patching.

Immediate Steps to Take

Juniper SIRT has not detected any malicious exploitation, but users are advised to apply the necessary software updates promptly.

Long-Term Security Practices

Implement access lists or firewall filters to restrict J-Web access to trusted administrative networks, hosts, and users to mitigate the risk of exploitation.

Patching and Updates

Juniper Networks has released software updates for various affected versions of Junos OS to resolve this XSS vulnerability.