#VU54063 XML External Entity injection in SilverStripe Framework - CVE-2020-25817

Vulnerability identifier: #VU54063

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-25817

CWE-ID: CWE-611

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SilverStripe Framework
Server applications / Frameworks for developing and running applications

Vendor: SilverStripe

Description

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to insufficient validation of user-supplied XML input in CSSContentParser. A remote administrator can pass a specially crafted XML code to the affected application and view contents of arbitrary files on the system or initiate requests to external systems.

Successful exploitation of the vulnerability may allow an attacker to view contents of arbitrary file on the server or perform network scanning of internal and external infrastructure.

Mitigation
Install update from vendor's website.

Vulnerable software versions

SilverStripe Framework: 4.0.0 - 4.7.3

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External links
https://www.silverstripe.org/download/security-releases/
https://www.silverstripe.org/blog/tag/release
https://forum.silverstripe.org/c/releases
https://www.silverstripe.org/download/security-releases/cve-2020-25817

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.