CVE-2023-37259 Cross site scripting in Export Chat feature

2023-07-1816:59:21

CWE-79

GitHub_M

www.cve.org

cve-2023-37259; cross site scripting; export chat; matrix-react-sdk; react-based sdk; web page; attacker-controlled elements; xss; null origin; impact restriction; leak message contents; malicious homeserver; server-side inputs; commit 22fcd34c60; release version 3.76.0; upgrade; workaround

6.1 Medium

CVSS3

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

0.0005 Low

EPSS

Percentile

17.9%

JSON

matrix-react-sdk is a react-based SDK for inserting a Matrix chat/voip client into a web page. The Export Chat feature includes certain attacker-controlled elements in the generated document without sufficient escaping, leading to stored Cross site scripting (XSS). Since the Export Chat feature generates a separate document, an attacker can only inject code run from the null origin, restricting the impact. However, the attacker can still potentially use the XSS to leak message contents. A malicious homeserver is a potential attacker since the affected inputs are controllable server-side. This issue has been addressed in commit 22fcd34c60 which is included in release version 3.76.0. Users are advised to upgrade. The only known workaround for this issue is to disable or to not use the Export Chat feature.

CNA Affected

[
  {
    "vendor": "matrix-org",
    "product": "matrix-react-sdk",
    "versions": [
      {
        "version": ">= 3.32.0, < 3.76.0",
        "status": "affected"
      }
    ]
  }
]