CVE-2024-39839 Remote username set to an arbitrary string by remote user

2024-08-0114:05:07

CWE-284

Mattermost

www.cve.org

cve

mattermost

remote username

arbitrary string

shared channels

CVSS3

4.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS

Percentile

14.7%

JSON

Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to disallow users to set their own remote username, when shared channels were enabled, which allows a user on a remote to set their remote username prop to an arbitrary string, which would be then synced to the local server as long as the user hadn’t been synced before.

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "product": "Mattermost",
    "vendor": "Mattermost",
    "versions": [
      {
        "status": "affected",
        "version": "9.9.0"
      },
      {
        "lessThanOrEqual": "9.5.6",
        "status": "affected",
        "version": "9.5.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "9.7.5",
        "status": "affected",
        "version": "9.7.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "9.8.1",
        "status": "affected",
        "version": "9.8.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "9.10.0"
      },
      {
        "status": "unaffected",
        "version": "9.9.1"
      },
      {
        "status": "unaffected",
        "version": "9.5.7"
      },
      {
        "status": "unaffected",
        "version": "9.7.6"
      },
      {
        "status": "unaffected",
        "version": "9.8.2"
      }
    ]
  }
]