high7.7

CVE-2021-21272

Zip slip directory exploit in github.com/deislabs/oras

Impact

### Impact The directory support (#55) 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`. Precisely, the following users of the affected versions are impacted - `oras` CLI users who runs `oras pull`. - Go programs, which invokes `github.com/deislabs/oras/pkg/content.FileStore`. ### Patches The problem has been patched by the PR linked with this advisory. Users should upgrade their `oras` CLI and packages to `0.9.0`. ### Workarounds 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. ### References - [Zip Slip](https://github.com/snyk/zip-slip-vulnerability) ### For more information If you have any questions or comments about this advisory: * Open an issue on the [GitHub repo](https://github.com/deislabs/oras) * Email the [list of maintainers](https://github.com/deislabs/oras/blob/main/MAINTAINERS)

Affected packages

Ecosystem	Package	Affected	Fixed in
go	`github.com/deislabs/oras`	< 0.9.0	0.9.0

Affected products

Vendor	Product	Affected versions
Deislabs	Oras	from 0.4.0 before 0.9.0

Weakness classification

CWE-22 CWE-59