Multiple vulnerabilities in SilverStripe Framework

Published: 2021-06-11

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-26138 CVE-2020-25817
CWE-ID	CWE-20 CWE-611
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	SilverStripe Framework Server applications / Frameworks for developing and running applications
Vendor	SilverStripe

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU54062

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-26138

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to a FormField with square brackets in the field name skips validation.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SilverStripe Framework: 3.0.0 - 4.7.3

CPE2.3

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-2020-26138

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) XML External Entity injection

EUVDB-ID: #VU54063

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 - Improper Restriction of XML External Entity Reference ('XXE')

Exploit availability: No

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.