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CVE-2018-25046: Cloudfoundry Archiver: Improper Limitation of a Pathname to a Restricted Directory

CVE-2018-25046 is rated critical with a CVSS v3.1 base score of 9.1 and NVD lists Cloudfoundry Archiver as the affected product. Per its scoring, it can be exploited over the network, without authentication, without any user interaction.

Vulnerability description

Due to improper path sanitization, archives containing relative file paths can cause files to be written (or overwritten) outside of the target directory.

Severity breakdown

CVSS v3.1 9.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

• Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
• Attack complexity: Low. No special conditions; the attack can be repeated reliably.
• Privileges required: None. No account or prior access is needed.
• User interaction: None. No action from any user is needed.
• Scope: Unchanged. Impact stays within the vulnerable component.
• Confidentiality impact: None. No loss of confidentiality.
• Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
• Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-22: Improper Limitation of a Pathname to a Restricted Directory

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Affected products

• Cloudfoundry Archiver: before 2018-05-23

References

• https://github.com/cloudfoundry/archiver/commit/09b5706aa9367972c09144a450bb4523049ee840
• https://pkg.go.dev/vuln/GO-2020-0025
• https://snyk.io/research/zip-slip-vulnerability