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Log4j RCE and mitigation techniques

Cloud Insidr 2021-12-21 Leave a Comment

Log4j RCE and mitigation techniques

For quite some time it seemed as if cyber vulnerabilities in the Java ecosystem would be losing ground. Instead, it was the calm before the storm: a vulnerability in the Log4j library threatens web servers and other applications in a variety of ways.

[Read more…]

Filed Under: Java, Uncategorized Tagged With: Five Eyes Alliance, Java, Log4j, RCE

Set up logrotate for Postfix

Cloud Insidr 2020-12-06 Leave a Comment

Set up logrotate for Postfix

Finding errors in a postfix log file is tedious work. The job gets even more complicated if you have to dig through old postfix log files which might no longer be relevant. logrotate comes to the rescue, but only if you configure it correctly.  Here is how you can do it on Fedora.

[Read more…]

Filed Under: Uncategorized Tagged With: log, logs, SELinux

Fixing your Web Server’s Security Headers: From Hall of Shame to Hall of Fame

Cloud Insidr 2020-12-04 Leave a Comment

Fixing your Web Server’s Security Headers: From Hall of Shame to Hall of Fame

[Updated 2022-11-30] This post explains how to set up robust security headers in NGINX to protect your web application from malicious payloads and other forms of attacks. Choose your HTTP(S) headers wisely.

[Read more…]

Filed Under: cloud, edge and everything in between, cybersecurity and cyber warfare, encryption, NGINX, Uncategorized, web servers in the cloud Tagged With: clickjacking, CSRF, HPKP, HSTS, MITM, x509, XSS

Cannot sign in to AWS as IAM user with MFA? How to resync your MFA token generator

Cloud Insidr 2020-11-15 Leave a Comment

Cannot sign in to AWS as IAM user with MFA? How to resync your MFA token generator

Problems signing in to AWS? When the login page “Sign in as IAM user” repeatedly says: “Your authentication information is incorrect. Please try again” though you entered correct information, your Gemalto token generator for MFA authentication could be out of sync.

Sign in as IAM user: Your authentication information is incorrect
Sign in as IAM user: Your authentication information is incorrect

[Read more…]

Filed Under: AWS, cybersecurity and cyber warfare Tagged With: AWS, Gemalto, IAM, MFA

Running Microsoft Azure In Your Own Data Center

Cloud Insidr 2020-09-29 Leave a Comment

Running Microsoft Azure In Your Own Data Center

In the stormy race of the digital transformation, the hybrid landscape of corporate IT is increasingly evading manageability. Could the control plane of a hyperscaler provide a lasting remedy? Would you need special hardware?

[Read more…]

Filed Under: Uncategorized Tagged With: Azure, Azure Active Directory, Azure Arc, Azure Lighthouse, Azure Resource Manager

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