Browsershot 3.57.3 - Server Side XSS to LFR via HTML

Summary

NameBrowsershot 3.57.3 - Server Side XSS to LFR via HTML
Code name
ProductBrowsershot
Affected versionsVersion 3.57.3
StatePublic
Release date2022-11-21

Vulnerability

KindServer Side XSS
Rule
RemoteYes
CVSSv3.1 VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSSv3.1 Base Score7.5
Exploit availableYes
CVE ID(s)

Description

Browsershot version 3.57.3 allows an external attacker to remotely obtain arbitrary local files. This is possible because the application does not validate that the JS content imported from an external source passed to the Browsershot::html method does not contain URLs that use the file:// protocol.

Vulnerability

This vulnerability occurs because the application does not validate that the JS content imported from an external source passed to the Browsershot::html method does not contain URLs that use the file:// protocol.

Evidence of exploitation

bypass-LFR-browsershot.gif

bypass-LFR-browsershot.png

Our security policy

We have reserved the CVE-2022-43984 to refer to these issues from now on.

System Information

  • Version: Browsershot 3.57.3

  • Operating System: GNU/Linux

Mitigation

An updated version of Browsershot is available at the vendor page.

Credits

The vulnerability was discovered by Carlos Bello from Fluid Attacks' Offensive Team.

References

Vendor page https://github.com/spatie/browsershot

Timeline

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2022-10-25

Vulnerability discovered.

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2022-10-25

Vendor contacted.

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2022-10-25

Vendor replied acknowledging the report.

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2022-10-25

Vendor Confirmed the vulnerability.

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2022-11-21

Public Disclosure.

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