CVE-2021-43808
Blade `@parent` Exploitation Leading To Possible XSS in Laravel
MEDIUM 5.3
At a glance
- Source
- NVD
- EPSS
- EPSS 0.83 % · percentile 57 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Modified
Description
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.
Weaknesses (CWE)
References
- https://github.com/laravel/framework/security/advisories/GHSA-66hf-2p6w-jqfw
- https://github.com/laravel/framework/pull/39906
- https://github.com/laravel/framework/pull/39908
- https://github.com/laravel/framework/pull/39909
- https://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9b
- https://github.com/laravel/framework/releases/tag/v6.20.42
- https://github.com/laravel/framework/releases/tag/v7.30.6
- https://github.com/laravel/framework/releases/tag/v8.75.0
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.3 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N | GitHub_M |
| CVSS 3.1 | MEDIUM 5.3 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | MEDIUM 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | NVD · nvd@nist.gov (Primary) |
| CVSS 2.0 | MEDIUM 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N | NVD · nvd@nist.gov (Primary) |
Advisories
- GHSA-66hf-2p6w-jqfw — Laravel Framework XSS in Blade templating engine
European references
- ENISA EUVD · EUVD-2021-2455
- GCVE · GCVE-0-2021-43808
Affected configurations (NVD CPE)
cpe:2.3:a:laravel:framework:*:*:*:*:*:*:*:*< 6.20.42cpe:2.3:a:laravel:framework:*:*:*:*:*:*:*:*≥ 7.0.0 < 7.30.6cpe:2.3:a:laravel:framework:*:*:*:*:*:*:*:*≥ 8.0.0 < 8.75.0
Affected products
| Product | Versions |
|---|---|
| laravel · framework | affected >= 8.0.0, < 8.75.0 ; affected >= 7.0.0, < 7.30.6 ; affected < 6.20.42 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |