CVE-2020-5226 Cross-site scripting in SimpleSAMLphp

2020-01-2421:15:15

CWE-79

GitHub_M

www.cve.org

4.4 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

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

0.001 Low

EPSS

Percentile

22.9%

JSON

Cross-site scripting in SimpleSAMLphp before version 1.18.4. The www/erroreport.php script allows error reports to be submitted and sent to the system administrator. Starting with SimpleSAMLphp 1.18.0, a new SimpleSAML\Utils\EMail class was introduced to handle sending emails, implemented as a wrapper of an external dependency. This new wrapper allows us to use Twig templates in order to create the email sent with an error report. Since Twig provides automatic escaping of variables, manual escaping of the free-text field in www/errorreport.php was removed to avoid double escaping. However, for those not using the new user interface yet, an email template is hardcoded into the class itself in plain PHP. Since no escaping is provided in this template, it is then possible to inject HTML inside the template by manually crafting the contents of the free-text field.

CNA Affected

[
  {
    "product": "SimpleSAMLphp",
    "vendor": "simplesamlphp",
    "versions": [
      {
        "status": "affected",
        "version": ">= 1.18.0, < 1.18.4"
      }
    ]
  }
]