CVE-2023-47865: Github.com/mattermost/mattermost/server/v8 Mattermost Improper Access Control Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-jj46-9cgh-qmfx
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CVSS 4.3
CWE-284
Published
Advisory Summary

CVE-2023-47865 is a MODERATE (CVSS 4.3) mattermost improper access control vulnerability vulnerability (CWE-284: Improper Access Control) affecting Github.com/mattermost/mattermost/server/v8 libraries in the Go ecosystem. The issue involves mattermost improper access control vulnerability. Remediation is available by upgrading affected packages to version 8.1.4, 7.8.13.

CVE-2023-47865 at a Glance

CVE Identifier CVE-2023-47865
GHSA Identifier GHSA-jj46-9cgh-qmfx
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-284: Improper Access Control
Affected Product Github.com/mattermost/mattermost/server/v8
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 4.3

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

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

How to Fix CVE-2023-47865

To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost/server/v8 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/mattermost/mattermost/server/v8 fixed: 8.1.4 
Upgrade github.com/mattermost/mattermost/server/v8 to 8.1.4
github.com/mattermost/mattermost-server/v6 fixed: 7.8.13 
Upgrade github.com/mattermost/mattermost-server/v6 to 7.8.13
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/mattermost/mattermost/server/v8

How to Check if You Are Affected

To determine whether your application is affected by CVE-2023-47865, inspect your project dependencies for Github.com/mattermost/mattermost/server/v8:

inspect dependencies for github.com/mattermost/mattermost/server/v8

Analyze the terminal output to locate any version of Github.com/mattermost/mattermost/server/v8 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.1.4), 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-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Github.com/mattermost/mattermost/server/v8, 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

Mattermost fails to check if hardened mode is enabled when overriding the username and/or the icon when posting a post. If settings allowed integrations to override the username and profile picture when posting, a member could also override the username and icon when making a post even if the Hardened Mode setting was enabled

CVE-2023-47865 Affected Github.com/mattermost/mattermost/server/v8 Versions

2 component(s)
Fixed Versions:
8.1.47.8.13
Product / Package Ecosystem Affected Versions Fixed Version
github.com/mattermost/mattermost/server/v8
golang/github.com/mattermost/mattermost/server/v8
Go
< 8.1.4
8.1.4
github.com/mattermost/mattermost-server/v6
golang/github.com/mattermost/mattermost-server/v6
Go
< 7.8.13
7.8.13

References

NVD — CVE-2023-47865 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-47865
Github.com/mattermost/mattermost/server/v8 Source Repository REPOSITORY
https://github.com/mattermost/mattermost
Github.com/mattermost/mattermost/server/v8 Security Information SECURITY
https://mattermost.com/security-updates

Frequently Asked Questions

What is CVE-2023-47865?
CVE-2023-47865 is a security vulnerability in Github.com/mattermost/mattermost/server/v8 involving Mattermost Improper Access Control vulnerability under CWE-284: Improper Access Control.
Which Github.com/mattermost/mattermost/server/v8 versions are affected?
Affected versions include releases prior to 8.1.4, 7.8.13 across affected packages: github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server/v6.
What version fixes CVE-2023-47865?
Upgrading to 8.1.4, 7.8.13 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/mattermost/mattermost/server/v8 affected?
Yes, github.com/mattermost/mattermost/server/v8 is affected in releases prior to 8.1.4. Upgrade your dependency to 8.1.4 or later.
Is github.com/mattermost/mattermost-server/v6 affected?
Yes, github.com/mattermost/mattermost-server/v6 is affected in releases prior to 7.8.13. Upgrade your dependency to 7.8.13 or later.
What is the CVSS score of CVE-2023-47865?
CVE-2023-47865 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2023-47865?
CVE-2023-47865 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check Go dependencies for CVE-2023-47865?
Run the dependency tree command: 'inspect dependencies for github.com/mattermost/mattermost/server/v8'. 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-jj46-9cgh-qmfx",
  "modified" : "2023-11-28T20:50:05Z",
  "published" : "2023-11-27T12:30:54Z",
  "aliases" : [ "CVE-2023-47865" ],
  "summary" : "Mattermost Improper Access Control vulnerability",
  "details" : "Mattermost fails to check if hardened mode is enabled when overriding the username and/or the icon when posting a post. If settings allowed integrations to override the username and profile picture when posting, a member could also override the username and icon when making a post even if the Hardened Mode setting was enabled\n\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost/server/v8"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.1.4"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost-server/v6"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "7.8.13"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-47865"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mattermost/mattermost"
  }, {
    "type" : "WEB",
    "url" : "https://mattermost.com/security-updates"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-11-28T20:50:05Z",
    "nvd_published_at" : "2023-11-27T09:15:32Z"
  }
}