CVE-2020-36565: Github.com/labstack/echo/v4 Path Traversal Vulnerability

MODERATE
Advisory Identifier: GHSA-j453-hm5x-c46w
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CVSS 5.3
CWE-22
Published
Advisory Summary

CVE-2020-36565 is a MODERATE (CVSS 5.3) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Github.com/labstack/echo/v4 libraries in the Go ecosystem. The issue involves echo vulnerable to directory traversal. Remediation is available by upgrading affected packages to version 4.2.0.

CVE-2020-36565 at a Glance

CVE Identifier CVE-2020-36565
GHSA Identifier GHSA-j453-hm5x-c46w
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Github.com/labstack/echo/v4
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.3

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:L/I:N/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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2020-36565

To remediate this vulnerability, upgrade all affected Github.com/labstack/echo/v4 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/labstack/echo/v4 fixed: 4.2.0 
Upgrade github.com/labstack/echo/v4 to 4.2.0
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/labstack/echo/v4

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-36565, inspect your project dependencies for Github.com/labstack/echo/v4:

inspect dependencies for github.com/labstack/echo/v4

Analyze the terminal output to locate any version of Github.com/labstack/echo/v4 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.2.0), 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/labstack/echo/v4, 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

Due to improper sanitization of user input on Windows, the static file handler allows for directory traversal, allowing an attacker to read files outside of the target directory that the server has permission to read.

CVE-2020-36565 Affected Github.com/labstack/echo/v4 Versions

1 component(s)
Fixed Versions:
4.2.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/labstack/echo/v4
golang/github.com/labstack/echo/v4
Go
< 4.2.0
4.2.0

References

NVD — CVE-2020-36565 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36565
Github.com/labstack/echo/v4 Source Repository REPOSITORY
https://github.com/labstack/echo/pull/1718
Security Fix Commit FIX COMMIT
https://github.com/labstack/echo/commit/4422e3b66b9fd498ed1ae1d0242d660d0ed3faaa
Github.com/labstack/echo/v4 Source Repository REPOSITORY
https://github.com/labstack/echo
pkg.go.dev/vuln/go-2021-0051 WEB
https://pkg.go.dev/vuln/GO-2021-0051

Frequently Asked Questions

What is CVE-2020-36565?
CVE-2020-36565 is a security vulnerability in Github.com/labstack/echo/v4 involving Echo vulnerable to directory traversal under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Github.com/labstack/echo/v4 versions are affected?
Affected versions include releases prior to 4.2.0 across affected packages: github.com/labstack/echo/v4.
What version fixes CVE-2020-36565?
Upgrading to 4.2.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/labstack/echo/v4 affected?
Yes, github.com/labstack/echo/v4 is affected in releases prior to 4.2.0. Upgrade your dependency to 4.2.0 or later.
What is the CVSS score of CVE-2020-36565?
CVE-2020-36565 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2020-36565?
CVE-2020-36565 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-2020-36565?
Run the dependency tree command: 'inspect dependencies for github.com/labstack/echo/v4'. 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-j453-hm5x-c46w",
  "modified" : "2022-12-12T20:48:00Z",
  "published" : "2022-12-07T18:30:26Z",
  "aliases" : [ "CVE-2020-36565" ],
  "summary" : "Echo vulnerable to directory traversal",
  "details" : "Due to improper sanitization of user input on Windows, the static file handler allows for directory traversal, allowing an attacker to read files outside of the target directory that the server has permission to read.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/labstack/echo/v4"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-36565"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/labstack/echo/pull/1718"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/labstack/echo/commit/4422e3b66b9fd498ed1ae1d0242d660d0ed3faaa"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/labstack/echo"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2021-0051"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-07T20:46:25Z",
    "nvd_published_at" : "2022-12-07T17:15:00Z"
  }
}