CVE-2021-43808 Blade `@parent` Exploitation Leading To Possible XSS in Laravel

2021-12-0722:20:12

CWE-79

GitHub_M

www.cve.org

cve-2021-43808

cross-site scripting

blade templating engine

laravel

security patch

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

EPSS

0.001

Percentile

50.0%

JSON

Laravel is a web application framework. Laravel prior to versions 8.75.0, 7.30.6, and 6.20.42 contain a possible cross-site scripting (XSS) vulnerability in the Blade templating engine. A broken HTML element may be clicked and the user taken to another location in their browser due to XSS. This is due to the user being able to guess the parent placeholder SHA-1 hash by trying common names of sections. If the parent template contains an exploitable HTML structure an XSS vulnerability can be exposed. This vulnerability has been patched in versions 8.75.0, 7.30.6, and 6.20.42 by determining the parent placeholder at runtime and using a random hash that is unique to each request.

CNA Affected

[
  {
    "product": "framework",
    "vendor": "laravel",
    "versions": [
      {
        "status": "affected",
        "version": ">= 8.0.0, < 8.75.0"
      },
      {
        "status": "affected",
        "version": ">= 7.0.0, < 7.30.6"
      },
      {
        "status": "affected",
        "version": "< 6.20.42"
      }
    ]
  }
]