CVE-2020-7669: Github.com/u root/u root Github.com/u-root/u-root/pkg/tarutil Arbitrary File Write Vulnerability

HIGH
Advisory Identifier: GHSA-75qf-wgfj-v652
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CVSS 7.5
CWE-22
Published
Advisory Summary

CVE-2020-7669 is a HIGH (CVSS 7.5) github.com/u-root/u-root/pkg/tarutil arbitrary file write vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Github.com/u root/u root libraries in the Go ecosystem. The issue involves github.com/u-root/u-root/pkg/tarutil arbitrary file write via archive extraction (zip slip). Remediation is available by upgrading affected packages to version 0.9.0.

CVE-2020-7669 at a Glance

CVE Identifier CVE-2020-7669
GHSA Identifier GHSA-75qf-wgfj-v652
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Github.com/u root/u root
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2020-7669

To remediate this vulnerability, upgrade all affected Github.com/u root/u root dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/u-root/u-root fixed: 0.9.0 
Upgrade github.com/u-root/u-root to 0.9.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/u-root/u-root

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-7669, inspect your project dependencies for Github.com/u root/u root:

inspect dependencies for github.com/u-root/u-root

Analyze the terminal output to locate any version of Github.com/u root/u root 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where 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. In Github.com/u root/u root, 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

This affects all versions up to and including version 0.7.0 of package github.com/u-root/u-root/pkg/tarutil. It is vulnerable to both leading and non-leading relative path traversal attacks in tar file extraction.

CVE-2020-7669 Affected Github.com/u root/u root Versions

1 component(s)
Fixed Versions:
0.9.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/u-root/u-root
golang/github.com/u-root/u-root
Go
< 0.9.0
0.9.0

References

NVD — CVE-2020-7669 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7669
Github.com/u root/u root Source Repository REPOSITORY
https://github.com/u-root/u-root/issues/2449
Github.com/u root/u root Source Repository REPOSITORY
https://github.com/u-root/u-root/pull/1817
Github.com/u root/u root Source Repository REPOSITORY
https://github.com/u-root/u-root/pull/2344
snyk.io/vuln/snyk-golang-gi... WEB
https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMUROOTUROOTPKGTARUTIL-570428

Frequently Asked Questions

What is CVE-2020-7669?
CVE-2020-7669 is a security vulnerability in Github.com/u root/u root involving github.com/u-root/u-root/pkg/tarutil Arbitrary File Write via Archive Extraction (Zip Slip) under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Github.com/u root/u root versions are affected?
Affected versions include releases prior to 0.9.0 across affected packages: github.com/u-root/u-root.
What version fixes CVE-2020-7669?
Upgrading to 0.9.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/u-root/u-root affected?
Yes, github.com/u-root/u-root is affected in releases prior to 0.9.0. Upgrade your dependency to 0.9.0 or later.
What is the CVSS score of CVE-2020-7669?
CVE-2020-7669 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2020-7669?
CVE-2020-7669 is classified under 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.).
How can I check Go dependencies for CVE-2020-7669?
Run the dependency tree command: 'inspect dependencies for github.com/u-root/u-root'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-75qf-wgfj-v652",
  "modified" : "2023-10-18T22:18:14Z",
  "published" : "2021-05-18T18:28:03Z",
  "aliases" : [ "CVE-2020-7669" ],
  "summary" : "github.com/u-root/u-root/pkg/tarutil Arbitrary File Write via Archive Extraction (Zip Slip)",
  "details" : "This affects all versions up to and including version 0.7.0 of package github.com/u-root/u-root/pkg/tarutil. It is vulnerable to both leading and non-leading relative path traversal attacks in tar file extraction.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/u-root/u-root"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.9.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7669"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/u-root/u-root/issues/2449"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/u-root/u-root/pull/1817"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/u-root/u-root/pull/2344"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMUROOTUROOTPKGTARUTIL-570428"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-05T19:02:17Z",
    "nvd_published_at" : null
  }
}