GHSA-9fmg-89fx-r33w BIT-silverstripe-2021-41559 CVE-2021-41559
Quadratic blowup in Convert::xml2array()
- Severity
- 6.5 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 1.09%
- Chance of exploitation in the next 30 days. Higher than 65.30% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-776 Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
- Fix
4.10.9- Upgrade silverstripe/framework to this version or later
Description
Silverstripe silverstripe/framework 4.x until 4.10.9 has a quadratic blowup in Convert::xml2array() that enables a remote attack via a crafted XML document.
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| silverstripe/framework | >= 4.0.0, < 4.10.9 |
4.10.9 |
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 → 4.10.9
- composer
composer require silverstripe/framework:^4.10.9
Severity breakdown
CVSS 3.1 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.
How to prevent it
- Operation: If possible, prohibit the use of DTDs or use an XML parser that limits the expansion of recursive DTD entities.
- Implementation: Before parsing XML files with associated DTDs, scan for recursive entity declarations and do not continue parsing potentially explosive content.
References
Advisories
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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