CVE-2020-7668: Github.com/unknwon/cae Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-88jf-7rch-32qc
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CVSS 7.5
CWE-22
Published
Advisory Summary

CVE-2020-7668 is a HIGH (CVSS 7.5) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Github.com/unknwon/cae libraries in the Go ecosystem. The issue involves github.com/unknwon/cae path traversal vulnerability. Remediation is available by upgrading affected packages to version 1.0.1.

CVE-2020-7668 at a Glance

CVE Identifier CVE-2020-7668
GHSA Identifier GHSA-88jf-7rch-32qc
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/unknwon/cae
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-2020-7668

To remediate this vulnerability, upgrade all affected Github.com/unknwon/cae 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/unknwon/cae fixed: 1.0.1 
Upgrade github.com/unknwon/cae to 1.0.1
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/unknwon/cae

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-7668, inspect your project dependencies for Github.com/unknwon/cae:

inspect dependencies for github.com/unknwon/cae

Analyze the terminal output to locate any version of Github.com/unknwon/cae in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.1), 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/unknwon/cae, 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

The ExtractTo function doesn't securely escape file paths in zip archives which include leading or non-leading "..". This allows an attacker to add or replace files system-wide.

CVE-2020-7668 Affected Github.com/unknwon/cae Versions

1 component(s)
Fixed Versions:
1.0.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/unknwon/cae
golang/github.com/unknwon/cae
Go
< 1.0.1
1.0.1

References

Github.com/unknwon/cae Source Repository REPOSITORY
https://github.com/unknwon/cae
NVD — CVE-2020-7668 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7668
Security Fix Commit FIX COMMIT
https://github.com/unknwon/cae/commit/07971c00a1bfd9dc171c3ad0bfab5b67c2287e11
pkg.go.dev/vuln/go-2020-0041 WEB
https://pkg.go.dev/vuln/GO-2020-0041
snyk.io/research/zip-slip-v... WEB
https://snyk.io/research/zip-slip-vulnerability
snyk.io/vuln/snyk-golang-gi... WEB
https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMUNKNWONCAETZ-570384

Frequently Asked Questions

What is CVE-2020-7668?
CVE-2020-7668 is a security vulnerability in Github.com/unknwon/cae involving github.com/unknwon/cae Path Traversal vulnerability under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Github.com/unknwon/cae versions are affected?
Affected versions include releases prior to 1.0.1 across affected packages: github.com/unknwon/cae.
What version fixes CVE-2020-7668?
Upgrading to 1.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/unknwon/cae affected?
Yes, github.com/unknwon/cae is affected in releases prior to 1.0.1. Upgrade your dependency to 1.0.1 or later.
What is the CVSS score of CVE-2020-7668?
CVE-2020-7668 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-2020-7668?
CVE-2020-7668 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-2020-7668?
Run the dependency tree command: 'inspect dependencies for github.com/unknwon/cae'. 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-88jf-7rch-32qc",
  "modified" : "2023-08-30T11:23:31Z",
  "published" : "2021-05-18T20:31:18Z",
  "aliases" : [ "CVE-2020-7668" ],
  "summary" : "github.com/unknwon/cae Path Traversal vulnerability",
  "details" : "The ExtractTo function doesn't securely escape file paths in zip archives which include leading or non-leading \"..\". This allows an attacker to add or replace files system-wide.",
  "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/unknwon/cae"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7668"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/unknwon/cae/commit/07971c00a1bfd9dc171c3ad0bfab5b67c2287e11"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/unknwon/cae"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2020-0041"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/research/zip-slip-vulnerability"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMUNKNWONCAETZ-570384"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-12T20:32:28Z",
    "nvd_published_at" : "2020-06-23T19:38:00Z"
  }
}