Arbitrary File Write via Archive Extraction (Zip Slip) Affecting github.com/openshift/source-to-image/pkg/tar Open this link in a new tab package, versions <1.1.10
Attack Complexity
Low
User Interaction
Required
Integrity
High
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snyk-id
SNYK-GOLANG-GITHUBCOMOPENSHIFTSOURCETOIMAGEPKGTAR-50077
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published
17 Jun 2018
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disclosed
28 Mar 2018
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credit
Michael Hanselmann
Introduced: 28 Mar 2018
CVE-2018-1103 Open this link in a new tabOverview
github.com/openshift/source-to-image/pkg/tar
is a toolkit and workflow for building reproducible Docker images from source code.
Affected versions of the package are vulnerable to Arbitrary File Write via Archive Extraction (AKA "Zip Slip").
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
Remediation
Upgrade github.com/openshift/source-to-image/pkg/tar
to version 1.1.10 or higher.