CVE-2023-2831 Denial of Service while unescaping a Markdown string

2023-06-1609:06:15

CWE-400

Mattermost

www.cve.org

cve-2023-2831

mattermost

markdown

unescape

vulnerability

dos

attacker

4.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

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

0.001 Low

EPSS

Percentile

32.7%

JSON

Mattermost fails to unescape Markdown strings in a memory-efficient way, allowing an attacker to cause a Denial of Service by sending a message containing a large number of escaped characters.

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "product": "Mattermost",
    "vendor": "Mattermost",
    "versions": [
      {
        "lessThanOrEqual": "7.1.9",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "7.8.4",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "7.9.3",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "7.10.0"
      },
      {
        "status": "unaffected",
        "version": "7.1.10 "
      },
      {
        "status": "unaffected",
        "version": "7.8.5"
      },
      {
        "status": "unaffected",
        "version": "7.9.4"
      },
      {
        "status": "unaffected",
        "version": "7.10.1"
      }
    ]
  }
]