CVE-2023-2808 Lack of URL normalization allows rendering previews for disallowed domains

2023-05-2909:07:34

CWE-20

Mattermost

www.cve.org

mattermost

url normalization

vulnerability

disallowed domain

preview

cve-2023-2808

4.3 Medium

CVSS3

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

0.0005 Low

EPSS

Percentile

18.4%

JSON

Mattermost fails to normalize UTF confusable characters when determining if a preview should be generated for a hyperlink, allowing an attacker to trigger link preview on a disallowed domain using a specially crafted link.

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "product": "Mattermost",
    "vendor": "Mattermost",
    "versions": [
      {
        "lessThan": "7.1.9",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      },
      {
        "lessThan": "7.8.4",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      },
      {
        "lessThan": "7.9.3",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "7.1.9"
      },
      {
        "status": "unaffected",
        "version": "7.8.4"
      },
      {
        "status": "unaffected",
        "version": "7.9.3"
      },
      {
        "status": "unaffected",
        "version": "7.10"
      }
    ]
  }
]