CVE-2021-0268 : Security Advisory and Response
Learn about CVE-2021-0268 affecting Juniper Networks Junos OS J-Web, allowing unauthenticated attackers to manipulate device integrity and exfiltrate information. Understand the impact, technical details, and mitigation steps.
An in-depth look into the CVE-2021-0268 vulnerability affecting Juniper Networks Junos OS J-Web, its impact, technical details, and mitigation steps.
Understanding CVE-2021-0268
This CVE discusses a vulnerability in the J-Web component of Juniper Networks Junos OS that allows an attacker to exploit HTTP Response Splitting, leading to various attacks.
What is CVE-2021-0268?
The CVE-2021-0268 vulnerability in Junos OS J-Web allows unauthenticated attackers to manipulate device integrity and exfiltrate information, facilitating XSS and cookie manipulation attacks. The affected versions range from 18.1 to 20.1.
The Impact of CVE-2021-0268
The vulnerability has a CVSS base score of 8.8, with high confidentiality impact. Attackers can carry out attacks without special permissions, impacting system integrity.
Technical Details of CVE-2021-0268
The vulnerability involves improper neutralization of CRLF sequences in HTTP headers, leading to buffer overflows and other exploits.
Vulnerability Description
Exploiting HTTP Response Splitting in J-Web allows attackers to modify device integrity, exfiltrate data, perform XSS, and conduct cookie manipulation attacks.
Affected Systems and Versions
Juniper Networks Junos OS versions 18.1 to 20.1 are affected by this vulnerability, with specific releases detailed in the advisory.
Exploitation Mechanism
The vulnerability can be exploited by directing users to malicious links, with no special permissions required for attackers to carry out exploits.
Mitigation and Prevention
Understanding the immediate steps, long-term security practices, and patching updates are crucial in mitigating the CVE-2021-0268 vulnerability.
Immediate Steps to Take
Disabling the J-Web service is recommended as an immediate mitigation step to reduce the risk of exploitation.
Long-Term Security Practices
Enforcing security best practices to limit access to trusted systems, administrators, and networks can help reduce the attack surface.
Patching and Updates
Juniper Networks has released software updates for versions 18.1 to 20.1, addressing the CVE-2021-0268 vulnerability and providing enhanced security.