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JavaScript plays a crucial role in web , and JavaScript files are essential components of web applications. Here are some important reasons why JavaScript files are significant in web
Interactivity: JavaScript enables developers to add interactivity and responsiveness to web pages, making them more engaging and user-friendly.
Dynamic Content: JavaScript allows for the dynamic loading and updating of content on web pages without requiring a full page reload, enhancing the user experience.
Form Validation: JavaScript enables client-side form validation, ensuring that user input meets specific criteria before submission, improving data accuracy and user experience.
JavaScript files can play a significant role in bug bounty programs, where security researchers identify and report vulnerabilities in web applications. JavaScript files can include the following:
aws access key
aws secret key
api key
passwords
admin credential
secret token
oauth_token
oauth token secret
if you discovered sensitive information it can be reported as information disclosure and you can also benefit from this information if it contains credentials, in this case, it can be reported as broken access control and so on.
Important Question: How Can I Analyze JavaScript Files ?
it’s easy just view page
Okay I’m kidding
I found valid login credentials in Java script files
Steps to do it
You’ll get a list of your domains We call it domains.txt And Any Tool for Crawling URLS
Katana or Waybackurl or gau
cat domains.txt | katana | grep js | httpx -mc 200 | tee js.txtexplaining the command :
cat domains.txt | katana: This command uses the cat utility to display the contents of the file domains.txt. It assumes that domains.txt contains a list of domain names or URLs and pass by | to katana to crawl urls from domainsgrep .js: The grep command is used for pattern matching in text files. In this case, it is searching for lines that contain the ".js" pattern, which indicates JavaScript files. This filters the output to only include lines that mention JavaScript files.httpx -mc 200: This command utilizes the httpx tool to send HTTP requests and retrieve responses from the filtered URLs. The -mc 200 option specifies to only show URLs that return a successful HTTP status code of 200 (OK). This filters out URLs that do not exist or return errors.tee js.txt: The tee command is used to display the output of a command and save it to a file simultaneously. In this case, it saves the filtered URLs that match the previous criteria into a file called js.txt.Now we have java sript links
Scanning by nuclie
nuclei -l js.txt -t ~/nuclei-templates/exposures/ -o js_bugs.txtAnother Way :
Download All links in js.txt
and do search about these
code :
file="js.txt"# Loop through each line in the file
while IFS= read -r link
do
# Download the JavaScript file using wget
wget "$link"
done < "$file"
And Boom
Good Bye
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