GHSA-q9cp-mc96-m4w2
XML External Entity in Dashboard Widget
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Packagist | typo3/cms-core | >= 10.0.0, < 10.4.10 | 10.4.10 |
| Packagist | typo3/cms | >= 10.0.0, < 10.4.10 | 10.4.10 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Problem
It has been discovered that RSS widgets are susceptible to XML external entity processing.
This vulnerability is reasonable, but is theoretical - it was not possible to actually reproduce the vulnerability with current PHP versions of supported and maintained system distributions.
At least with _libxml2_ version 2.9, the processing of XML external entities is disabled per default - and cannot be exploited. Besides that, a valid backend user account is needed.
### Solution
Update to TYPO3 version 10.4.10 that fixes the problem described.
References
External links from the advisory. They lead to third-party sites.
- https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-q9cp-mc96-m4w2
- https://nvd.nist.gov/vuln/detail/CVE-2020-26229
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2020-26229.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2020-26229.yaml
- https://typo3.org/security/advisory/typo3-core-sa-2020-012