The Cyber Guardian

The error "could not find valid base url for repo: base/7/x86_64" in CentOS usually occurs because the YUM package manager cannot access the repository URLs it needs to download packages. Steps to solve the issue: Check whether the device is connected to internet. Open terminal  ping www.google.com  to test the stability of the internet and to check whether you can reach the web server. If the server is reachable then we can confirm that the problem is with base repo of the operating system. Locate to the path /etc/yum.repos.d using change directory  command. cd /etc/yum.repos.d. Open the file CentOS-Base.repo using vim text editor sudo vim CentOS-Base.repo. Use esc+:%d to clean the entire content present in the file and add the repo given below. # CentOS-Base.repo # # The mirror system uses the connecting IP address of the client and the # update status of each mirror to pick mirrors that are updated to and # geographically close to the client. You should use this f...

Open Redirect:     An open redirect is a type of web vulnerability where a website has a parameter that can redirect a user to an external URL without proper validation. This can be exploited by attackers to redirect users to malicious sites, phishing pages, or unwanted content. Risks of Open Redirects: Phishing Attacks: Attackers can use open redirects to craft convincing phishing URLs that appear to come from a trusted site. Malware Distribution: Users can be redirected to sites that host malware, increasing the risk of infections. Loss of Trust: Users may lose trust in a website that unknowingly redirects them to malicious or unwanted content. Payloads: Example: https://cyberguardian40.blogspot.com /redirect?url=https://www.google.com ?url=http://{target} ?url=$2f%2f{target} ?next=http://{target} /redirect/{target} ?view=/{target} /login?to={target} Remediation: Remove the redirection function from the application, and replace links to it with direct links to the relev...