Staging Environment: Content and features may be unstable or change without notice.
Advisory details: gitlab / packagist/silverstripe/framework/CVE-2020-25817
Advisory ID gitlab/packagist/silverstripe/framework/CVE-2020-25817
Aliases CVE-2020-25817
Summary Improper Restriction of XML External Entity Reference SilverStripe has an XXE Vulnerability in CSSContentParser. A developer utility meant for parsing HTML within unit tests can be vulnerable to XML External Entity (XXE) attacks. When this developer utility is misused for purposes involving external or user submitted data in custom project code, it can lead to vulnerabilities such as XSS on HTML output rendered through this custom code. This is now mitigated by disabling external entities during parsing.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-611 Improper Restriction of XML External Entity Reference
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv2 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/silverstripe/framework/CVE-2020-25817.yml
cvssv3.1 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/silverstripe/framework/CVE-2020-25817.yml
Reference id Reference type URL
https://forum.silverstripe.org/c/releases
https://www.silverstripe.org/blog/tag/release
https://www.silverstripe.org/download/security-releases/
CVE-2020-25817 https://nvd.nist.gov/vuln/detail/CVE-2020-25817
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: AV:N/AC:M/Au:S/C:N/I:P/A:N Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/silverstripe/framework/CVE-2020-25817.yml
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/silverstripe/framework/CVE-2020-25817.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.