Arbitrary File Write via Archive Extraction (Zip Slip) Affecting github.com/cloudfoundry/archiver/extractor Open this link in a new tab package, versions
Exploit Maturity
Mature
Attack Complexity
Low
Integrity
High
Availability
High
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snyk-id
SNYK-GOLANG-GITHUBCOMCLOUDFOUNDRYARCHIVEREXTRACTOR-1293212
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published
10 Jun 2018
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disclosed
27 May 2018
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credit
M. Hanselmann
Introduced: 27 May 2018
CWE-29 Open this link in a new tabOverview
code.cloudfoundry.org/archiver
is Utilities for extracting and compressing tgz and zip files..
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 code.cloudfoundry.org/archiver
to hash 09b5706aa9367972c09144a450bb4523049ee840.