Arbitrary File Write via Archive Extraction (Zip Slip) Affecting ca.uhn.hapi.fhir:org.hl7.fhir.utilities package, versions [,5.6.106)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.08% (37th percentile)

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  • Snyk IDSNYK-JAVA-CAUHNHAPIFHIR-3358779
  • published12 Mar 2023
  • disclosed10 Mar 2023
  • creditJonathan Leitschuh

Introduced: 10 Mar 2023

CVE-2023-28465  (opens in a new tab)
CWE-29  (opens in a new tab)

How to fix?

Upgrade ca.uhn.hapi.fhir:org.hl7.fhir.utilities to version 5.6.106 or higher.

Overview

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) this is due to a bypass of CVE-2023-24057. This issue allows a malicious actor to potentially break out of the TerminologyCacheManager cache directory. The impact is limited to sibling directories.

For example, consider "/usr/outnot".startsWith("/usr/out"). The check is bypassed although /outnot is not under the /out directory.

Details

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

CVSS Scores

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