CVE-2022-3257: Github.com/mattermost/mattermost server/v6 Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-m7w4-q5vg-5xfp
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CVSS 6.5
CWE-434
Published
Advisory Summary

CVE-2022-3257 is a MODERATE (CVSS 6.5) denial of service vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Github.com/mattermost/mattermost server/v6 libraries in the Go ecosystem. The issue involves mattermost subject to denial of service via upload of special gif. Remediation is available by upgrading affected packages to version 7.2.0.

CVE-2022-3257 at a Glance

CVE Identifier CVE-2022-3257
GHSA Identifier GHSA-m7w4-q5vg-5xfp
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Github.com/mattermost/mattermost server/v6
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.5

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:N/A:H).

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 None (I:N)
Availability High (A:H)

How to Fix CVE-2022-3257

To remediate this vulnerability, upgrade all affected Github.com/mattermost/mattermost server/v6 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/v6 fixed: 7.2.0 
Upgrade github.com/mattermost/mattermost-server/v6 to 7.2.0
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/mattermost/mattermost-server/v6

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-3257, inspect your project dependencies for Github.com/mattermost/mattermost server/v6:

inspect dependencies for github.com/mattermost/mattermost-server/v6

Analyze the terminal output to locate any version of Github.com/mattermost/mattermost server/v6 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 7.2.0), 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-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. In Github.com/mattermost/mattermost server/v6, 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 version 7.1.x and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service.

CVE-2022-3257 Affected Github.com/mattermost/mattermost server/v6 Versions

1 component(s)
Fixed Versions:
7.2.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/mattermost/mattermost-server/v6
golang/github.com/mattermost/mattermost-server/v6
Go
≥ 7.1.0
< 7.2.0
7.2.0

References

NVD — CVE-2022-3257 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-3257
hackerone.com/reports/1620170 WEB
https://hackerone.com/reports/1620170
Github.com/mattermost/mattermost server/v6 Source Repository REPOSITORY
https://github.com/mattermost/mattermost-server
Github.com/mattermost/mattermost server/v6 Security Information SECURITY
https://mattermost.com/security-updates

Frequently Asked Questions

What is CVE-2022-3257?
CVE-2022-3257 is a security vulnerability in Github.com/mattermost/mattermost server/v6 involving Mattermost subject to Denial of Service via upload of special GIF under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Github.com/mattermost/mattermost server/v6 versions are affected?
Affected versions include releases prior to 7.2.0 across affected packages: github.com/mattermost/mattermost-server/v6.
What version fixes CVE-2022-3257?
Upgrading to 7.2.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/mattermost/mattermost-server/v6 affected?
Yes, github.com/mattermost/mattermost-server/v6 is affected in releases prior to 7.2.0. Upgrade your dependency to 7.2.0 or later.
What is the CVSS score of CVE-2022-3257?
CVE-2022-3257 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2022-3257?
CVE-2022-3257 is classified under CWE-434: Unrestricted Upload of File with Dangerous Type (The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.).
How can I check Go dependencies for CVE-2022-3257?
Run the dependency tree command: 'inspect dependencies for github.com/mattermost/mattermost-server/v6'. 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-m7w4-q5vg-5xfp",
  "modified" : "2022-09-28T14:14:03Z",
  "published" : "2022-09-25T00:00:21Z",
  "aliases" : [ "CVE-2022-3257" ],
  "summary" : "Mattermost subject to Denial of Service via upload of special GIF",
  "details" : "Mattermost version 7.1.x and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/mattermost/mattermost-server/v6"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.1.0"
      }, {
        "fixed" : "7.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-3257"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/1620170"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mattermost/mattermost-server"
  }, {
    "type" : "WEB",
    "url" : "https://mattermost.com/security-updates"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-09-28T14:14:03Z",
    "nvd_published_at" : "2022-09-23T15:15:00Z"
  }
}