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CVE-2021-43808

Blade `@parent` Exploitation Leading To Possible XSS in Laravel

Published: Dec 7, 2021Updated: Nov 21, 2024 Sources: CVE List NVD GHSACWE-79
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.8%
Top 48.3%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-79CWE-327

Affected Products

frameworklaravel
On-prem
OSS Libraries / web-framework
laravel/frameworkPackagistOSS Libraries
illuminate/viewPackagistOSS Libraries
laraveloss-projectUSOSS Librariesaka laravel framework, livewire
packagistpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

3 techniques
Collection
Execution
Initial Access
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References

https://github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9b
github.com
https://github.com/laravel/framework/pull/39906
github.com
https://github.com/laravel/framework/pull/39908
github.com
and 9 more references View all →

Timeline

Published
Dec 7, 2021
Last Updated
Nov 21, 2024

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