CVE-2021-31232: Github.com/cortexproject/cortex Improper Input Validation Vulnerability

MODERATE
Advisory Identifier: GHSA-m45g-f45x-vv22
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CVSS 5.5
CWE-20
Published
Advisory Summary

CVE-2021-31232 is a MODERATE (CVSS 5.5) improper input validation vulnerability (CWE-20: Improper Input Validation) affecting Github.com/cortexproject/cortex libraries in the Go ecosystem. The issue involves improper input validation in cncf cortex. Remediation is available by upgrading affected packages to version 1.8.1.

CVE-2021-31232 at a Glance

CVE Identifier CVE-2021-31232
GHSA Identifier GHSA-m45g-f45x-vv22
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-20: Improper Input Validation
Affected Product Github.com/cortexproject/cortex
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.5

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

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

How to Fix CVE-2021-31232

To remediate this vulnerability, upgrade all affected Github.com/cortexproject/cortex 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/cortexproject/cortex fixed: 1.8.1 
Upgrade github.com/cortexproject/cortex to 1.8.1
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/cortexproject/cortex

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-31232, inspect your project dependencies for Github.com/cortexproject/cortex:

inspect dependencies for github.com/cortexproject/cortex

Analyze the terminal output to locate any version of Github.com/cortexproject/cortex in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.8.1), 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Github.com/cortexproject/cortex, 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 Alertmanager in CNCF Cortex before 1.8.1 has a local file disclosure vulnerability when -experimental.alertmanager.enable-api is used. The HTTP basic auth password_file can be used as an attack vector to send any file content via a webhook. The alertmanager templates can be used as an attack vector to send any file content because the alertmanager can load any text file specified in the templates list.

CVE-2021-31232 Affected Github.com/cortexproject/cortex Versions

1 component(s)
Fixed Versions:
1.8.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/cortexproject/cortex
golang/github.com/cortexproject/cortex
Go
< 1.8.1
1.8.1

References

NVD — CVE-2021-31232 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31232
Github.com/cortexproject/cortex Source Repository REPOSITORY
https://github.com/cortexproject/cortex/pull/4129/files
Github.com/cortexproject/cortex Security Information SECURITY
https://community.grafana.com/c/security-announcements
Github.com/cortexproject/cortex Source Repository REPOSITORY
https://github.com/cortexproject/cortex
lists.cncf.io/g/cortex-users/mess... WEB
https://lists.cncf.io/g/cortex-users/message/50

Frequently Asked Questions

What is CVE-2021-31232?
CVE-2021-31232 is a security vulnerability in Github.com/cortexproject/cortex involving Improper input validation in CNCF Cortex under CWE-20: Improper Input Validation.
Which Github.com/cortexproject/cortex versions are affected?
Affected versions include releases prior to 1.8.1 across affected packages: github.com/cortexproject/cortex.
What version fixes CVE-2021-31232?
Upgrading to 1.8.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/cortexproject/cortex affected?
Yes, github.com/cortexproject/cortex is affected in releases prior to 1.8.1. Upgrade your dependency to 1.8.1 or later.
What is the CVSS score of CVE-2021-31232?
CVE-2021-31232 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2021-31232?
CVE-2021-31232 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Go dependencies for CVE-2021-31232?
Run the dependency tree command: 'inspect dependencies for github.com/cortexproject/cortex'. 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-m45g-f45x-vv22",
  "modified" : "2021-05-20T21:19:40Z",
  "published" : "2021-06-23T17:20:38Z",
  "aliases" : [ "CVE-2021-31232" ],
  "summary" : "Improper input validation in CNCF Cortex",
  "details" : "The Alertmanager in CNCF Cortex before 1.8.1 has a local file disclosure vulnerability when -experimental.alertmanager.enable-api is used. The HTTP basic auth password_file can be used as an attack vector to send any file content via a webhook. The alertmanager templates can be used as an attack vector to send any file content because the alertmanager can load any text file specified in the templates list.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/cortexproject/cortex"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.8.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-31232"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cortexproject/cortex/pull/4129/files"
  }, {
    "type" : "WEB",
    "url" : "https://community.grafana.com/c/security-announcements"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cortexproject/cortex"
  }, {
    "type" : "WEB",
    "url" : "https://lists.cncf.io/g/cortex-users/message/50"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-20T21:19:40Z",
    "nvd_published_at" : "2021-04-30T13:15:00Z"
  }
}