CVE-2021-21272: ORAS Zip-Slip Vulnerability
Summary
CVE-2021-21272: zip slip in ORAS. Affects oras versions >= 0.4.0, < 0.9.0. Fixed in 0.9.0. How to fix ↓
Also tracked for
The same CVE-2021-21272 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
ORAS is an open source software that allows pushing OCI Artifacts to OCI Conformant registries. It serves as both a CLI tool and a Go Module. The vulnerability affects ORAS versions 0.4.0 to 0.9.0. ORAS supports the extraction of gzipped tarballs to a user-specified directory. However, a flaw in the directory support feature allows malicious artifact providers to create symbolic links and hard links that can overwrite or modify files outside of the specified directory. This can lead to unauthorized access and potential compromise of the host filesystem.
Vulnerability Detail
The zip-slip vulnerability in ORAS allows an attacker to manipulate tarballs in a way that enables them to write, link, or overwrite files on the host filesystem outside of the intended directory. This can be exploited by a malicious artifact provider to gain unauthorized access and potentially execute arbitrary code with the same permissions as the user running the oras pull command. The vulnerability has a CVSSv3 severity score of 7.5 (High).
How To Fix
Minimum fixed version
0.9.0
This is the first release that contains the fix.
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Conclusion
The zip-slip vulnerability in ORAS can be mitigated by updating to version 0.9.0 or later. Users should also exercise caution when pulling artifacts and only trust providers with a good reputation. For further support on vulnerability remediation, contact DevNack.com.
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FAQ
ORAS is open source software that enables pushing OCI Artifacts to OCI Conformant registries. It can be used as a CLI tool or a Go Module.
ORAS versions 0.4.0 to 0.9.0 are affected by the zip-slip vulnerability.
The vulnerability allows malicious artifact providers to overwrite or modify files outside of the user-specified directory, potentially leading to unauthorized access and compromise of the host filesystem.
Update ORAS to version 0.9.0 or later. For oras CLI users, only pull artifacts from trusted providers. For oras package users, avoid using github.com/deislabs/oras/pkg/content.FileStore and use other content stores or trusted artifact providers.
The vulnerability has a CVSSv3 severity score of 7.5 (High).
References
Related vulnerabilities
Recent vulnerabilities recorded for oras.
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