CVE-2021-21272

Aliases:GHSA-g5v4-5x39-vwhxBIT-oras-2021-21272GO-2021-0099
Advisory lineage Upstream: 0 Downstream: 3
Modified
Published: 25 Jan 2021, 18:30
Last modified:03 Aug 2024, 18:09

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.7 HIGH
v3.1 (cve.org)
EPSS Score
0.3% LOW
0% probability -0.10%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Jan 2021, 18:30
Published
Vulnerability first disclosed
03 Aug 2024, 18:09
Last Modified
Vulnerability information updated

Description

ORAS is open source software which enables a way to push OCI Artifacts to OCI Conformant registries. ORAS is both a CLI for initial testing and a Go Module. In ORAS from version 0.4.0 and before version 0.9.0, there is a "zip-slip" vulnerability. The directory support feature allows the downloaded gzipped tarballs to be automatically extracted to the user-specified directory where the tarball can have symbolic links and hard links. A well-crafted tarball or tarballs allow malicious artifact providers linking, writing, or overwriting specific files on the host filesystem outside of the user-specified directory unexpectedly with the same permissions as the user who runs `oras pull`. Users of the affected versions are impacted if they are `oras` CLI users who runs `oras pull`, or if they are Go programs, which invoke `github.com/deislabs/oras/pkg/content.FileStore`. The problem has been fixed in version 0.9.0. For `oras` CLI users, there is no workarounds other than pulling from a trusted artifact provider. For `oras` package users, the workaround is to not use `github.com/deislabs/oras/pkg/content.FileStore`, and use other content stores instead, or pull from a trusted artifact provider.

CVSS Metrics

  • v3.1•HIGH•Score: 7.7CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
  • v2.0•MEDIUM•Score: 4AV:N/AC:L/Au:S/C:N/I:P/A:N

EPSS Trends

Current EPSS score: 0.30%• Percentile: 54%

Techniques & Countermeasures

  • CWE-59•Improper Link Resolution Before File Access ('Link Following')

    The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

  • CWE-22•Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

    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 Systems

  • deislabs•oras

    ≥ 0.4.0, < 0.9.0

  • github.com/deislabs•oras

    < 0.9.0

References (7)