CVE-2021-21272: Github.com/deislabs/oras Zip Slip Directory Exploit Vulnerability
HIGHCVE-2021-21272 is a HIGH (CVSS 7.7) zip slip directory exploit vulnerability (CWE-59: Improper Link Resolution Before File Access ('Link Following')) affecting Github.com/deislabs/oras libraries in the Go ecosystem. The issue involves zip slip directory exploit in github.com/deislabs/oras. Remediation is available by upgrading affected packages to version 0.9.0.
CVE-2021-21272 at a Glance
Security Impact
CVSS: 7.7
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N).
How to Fix CVE-2021-21272
To remediate this vulnerability, upgrade all affected Github.com/deislabs/oras dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/deislabs/oras to 0.9.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/deislabs/orasHow to Check if You Are Affected
To determine whether your application is affected by CVE-2021-21272, inspect your project dependencies for Github.com/deislabs/oras:
inspect dependencies for github.com/deislabs/orasAnalyze the terminal output to locate any version of Github.com/deislabs/oras in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.9.0), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following'), where 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. In Github.com/deislabs/oras, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2021-21272 Affected Github.com/deislabs/oras Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/deislabs/oras
|
Go |
< 0.9.0
|
0.9.0
|
References
Frequently Asked Questions
What is CVE-2021-21272?
Which Github.com/deislabs/oras versions are affected?
What version fixes CVE-2021-21272?
Is github.com/deislabs/oras affected?
What is the CVSS score of CVE-2021-21272?
What CWE is associated with CVE-2021-21272?
How can I check Go dependencies for CVE-2021-21272?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-g5v4-5x39-vwhx",
"modified" : "2022-10-25T20:26:42Z",
"published" : "2022-02-15T00:32:04Z",
"aliases" : [ "CVE-2021-21272" ],
"summary" : "Zip slip directory exploit in github.com/deislabs/oras",
"details" : "### Impact\nThe 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.\n\nA 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`. \n\nPrecisely, the following users of the affected versions are impacted\n- `oras` CLI users who runs `oras pull`.\n- Go programs, which invokes `github.com/deislabs/oras/pkg/content.FileStore`.\n\n### Patches\nThe problem has been patched by the PR linked with this advisory. Users should upgrade their `oras` CLI and packages to `0.9.0`.\n\n### Workarounds\nFor `oras` CLI users, there is no workarounds other than pulling from a trusted artifact provider.\n\nFor `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.\n\n### References\n- [Zip Slip](https://github.com/snyk/zip-slip-vulnerability)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue on the [GitHub repo](https://github.com/deislabs/oras)\n* Email the [list of maintainers](https://github.com/deislabs/oras/blob/main/MAINTAINERS)",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/deislabs/oras"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.9.0"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/deislabs/oras/security/advisories/GHSA-g5v4-5x39-vwhx"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21272"
}, {
"type" : "WEB",
"url" : "https://github.com/deislabs/oras/commit/96cd90423303f1bb42bd043cb4c36085e6e91e8e"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/deislabs/oras"
}, {
"type" : "WEB",
"url" : "https://github.com/deislabs/oras/releases/tag/v0.9.0"
}, {
"type" : "WEB",
"url" : "https://pkg.go.dev/github.com/deislabs/oras/pkg/oras"
}, {
"type" : "WEB",
"url" : "https://pkg.go.dev/vuln/GO-2021-0099"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22", "CWE-59" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2021-05-21T14:42:50Z",
"nvd_published_at" : "2021-01-25T19:15:00Z"
}
}