CVE-2020-36567: Github.com/gin gonic/gin Gin's Default Logger Allows Unsanitized Vulnerability

HIGH
Advisory Identifier: GHSA-6vm3-jj99-7229
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CVSS 7.5
CWE-116 CWE-117
Published
Advisory Summary

CVE-2020-36567 is a HIGH (CVSS 7.5) gin's default logger allows unsanitized vulnerability (CWE-116: Improper Encoding or Escaping of Output) affecting Github.com/gin gonic/gin libraries in the Go ecosystem. The issue involves gin's default logger allows unsanitized input that can allow remote attackers to inject arbitrary log lines. Remediation is available by upgrading affected packages to version 1.6.0.

CVE-2020-36567 at a Glance

CVE Identifier CVE-2020-36567
GHSA Identifier GHSA-6vm3-jj99-7229
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-116: Improper Encoding or Escaping of Output
Affected Product Github.com/gin gonic/gin
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-2020-36567

To remediate this vulnerability, upgrade all affected Github.com/gin gonic/gin 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/gin-gonic/gin fixed: 1.6.0 
Upgrade github.com/gin-gonic/gin to 1.6.0
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/gin-gonic/gin

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-36567, inspect your project dependencies for Github.com/gin gonic/gin:

inspect dependencies for github.com/gin-gonic/gin

Analyze the terminal output to locate any version of Github.com/gin gonic/gin in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.6.0), 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-116: Improper Encoding or Escaping of Output, where the product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. as a result, the intended structure of the message is not preserved. In Github.com/gin gonic/gin, 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

Gin is a HTTP web framework written in Go (Golang). Unsanitized input in the default logger in github.com/gin-gonic/gin before v1.6.0 allows remote attackers to inject arbitrary log lines.

CVE-2020-36567 Affected Github.com/gin gonic/gin Versions

1 component(s)
Fixed Versions:
1.6.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/gin-gonic/gin
golang/github.com/gin-gonic/gin
Go
< 1.6.0
1.6.0

References

NVD — CVE-2020-36567 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36567
Github.com/gin gonic/gin Source Repository REPOSITORY
https://github.com/gin-gonic/gin/pull/2237
Security Fix Commit FIX COMMIT
https://github.com/gin-gonic/gin/commit/a71af9c144f9579f6dbe945341c1df37aaf09c0d
Github.com/gin gonic/gin Source Repository REPOSITORY
https://github.com/gin-gonic/gin
pkg.go.dev/vuln/go-2020-0001 WEB
https://pkg.go.dev/vuln/GO-2020-0001

Frequently Asked Questions

What is CVE-2020-36567?
CVE-2020-36567 is a security vulnerability in Github.com/gin gonic/gin involving Gin's default logger allows unsanitized input that can allow remote attackers to inject arbitrary log lines under CWE-116: Improper Encoding or Escaping of Output.
Which Github.com/gin gonic/gin versions are affected?
Affected versions include releases prior to 1.6.0 across affected packages: github.com/gin-gonic/gin.
What version fixes CVE-2020-36567?
Upgrading to 1.6.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/gin-gonic/gin affected?
Yes, github.com/gin-gonic/gin is affected in releases prior to 1.6.0. Upgrade your dependency to 1.6.0 or later.
What is the CVSS score of CVE-2020-36567?
CVE-2020-36567 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-2020-36567?
CVE-2020-36567 is classified under CWE-116: Improper Encoding or Escaping of Output (The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.).
How can I check Go dependencies for CVE-2020-36567?
Run the dependency tree command: 'inspect dependencies for github.com/gin-gonic/gin'. 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-6vm3-jj99-7229",
  "modified" : "2023-01-10T15:56:22Z",
  "published" : "2022-12-27T21:30:20Z",
  "aliases" : [ "CVE-2020-36567" ],
  "summary" : "Gin's default logger allows unsanitized input that can allow remote attackers to inject arbitrary log lines",
  "details" : "Gin is a HTTP web framework written in Go (Golang). Unsanitized input in the default logger in github.com/gin-gonic/gin before v1.6.0 allows remote attackers to inject arbitrary log lines.",
  "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/gin-gonic/gin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.6.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-36567"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gin-gonic/gin/pull/2237"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gin-gonic/gin/commit/a71af9c144f9579f6dbe945341c1df37aaf09c0d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/gin-gonic/gin"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2020-0001"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-116", "CWE-117" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-30T00:56:53Z",
    "nvd_published_at" : "2022-12-27T21:15:00Z"
  }
}