GHSA-3vjc-5x79-m9r8 BIT-silverstripe-2020-25817 CVE-2020-25817
SilverStripe XXE Vulnerability in CSSContentParser
- Severity
- 4.8 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 0.82%
- Chance of exploitation in the next 30 days. Higher than 57.29% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-611 Improper Restriction of XML External Entity Reference
- Fix
4.7.4- Upgrade silverstripe/framework to this version or later
Description
SilverStripe through 4.6.0-rc1 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. (The correct CVE ID year is 2020 [CVE-2020-25817, not CVE-2021-25817]).
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| silverstripe/framework | >= 4.0.0, < 4.7.4 |
4.7.4 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
silverstripe/framework Packagist → 4.7.4
- composer
composer require silverstripe/framework:^4.7.4
Severity breakdown
CVSS 3.1 4.8
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Weakness
CWE-611: Improper Restriction of XML External Entity Reference
The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
How to prevent it
- Implementation, System Configuration: Many XML parsers and validators can be configured to disable external entity expansion.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-gvrw-qqp5-jgc5 Silverstripe Framework: Possible XSS attack through media embed | Medium | Also affects silverstripe/framework |
| GHSA-256q-hx8w-xcqx Silverstripe Framework user enumeration via timing attack on login and password reset forms | Medium | Also affects silverstripe/framework |
| GHSA-rhx4-hvx9-j387 Silverstripe Framework has a XSS vulnerability in HTML editor | Medium | Also affects silverstripe/framework |
| GHSA-74j9-xhqr-6qv3 Reflected Cross Site Scripting (XSS) in error message | Low | Also affects silverstripe/framework |
| GHSA-mqf3-qpc3-g26q Silverstripe Framework has a Reflected Cross Site Scripting (XSS) in error message | Low | Also affects silverstripe/framework |
| GHSA-ff6q-3c9c-6cf5 Silverstripe Framework has a XSS in form messages | Medium | Also affects silverstripe/framework |
| GHSA-7cmp-cgg8-4c82 Silverstripe Framework has a XSS via insert media remote file oembed | Medium | Also affects silverstripe/framework |
| GHSA-52cw-pvq9-9m5v Silverstripe uses TinyMCE which allows svg files linked in object tags | Medium | Also affects silverstripe/framework |
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