CVE-2019-11881 Explained : Impact and Mitigation

Rancher 2.1.4 login component vulnerability allows manipulation of the errorMsg parameter to display unauthorized content, potentially leading to phishing attacks.

Understanding CVE-2019-11881

The vulnerability in Rancher 2.1.4 enables malicious users to deceive legitimate users into visiting malicious websites through scare tactics.

What is CVE-2019-11881?

The login component of Rancher 2.1.4 has a vulnerability that permits manipulation of the errorMsg parameter to display unauthorized content, posing a risk of phishing attacks.

The Impact of CVE-2019-11881

Malicious users can exploit this vulnerability to trick unsuspecting users into visiting phishing websites using scare tactics.
Unauthorized content can be displayed to users, potentially leading to information disclosure or further exploitation.

Technical Details of CVE-2019-11881

The technical aspects of the vulnerability in Rancher 2.1.4.

Vulnerability Description

The vulnerability allows the errorMsg parameter to be manipulated to display arbitrary content.
While tags are filtered, special characters and symbols are not, enabling the display of unauthorized messages.

Affected Systems and Versions

Product: Rancher
Version: 2.1.4

Exploitation Mechanism

Malicious users can manipulate the errorMsg parameter to show misleading messages, luring users to visit phishing websites.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2019-11881.

Immediate Steps to Take

Update Rancher to the latest version to patch the vulnerability.
Educate users to be cautious of unexpected messages or prompts.

Long-Term Security Practices

Regularly monitor and audit web content for unauthorized changes.
Implement content security policies to restrict the display of external content.

Patching and Updates

Apply security patches promptly to address known vulnerabilities and enhance system security.