ZF2012-05: Potential XML eXternal Entity injection vectors in Zend Framework 1 Zend_Feed component
Zend_Feed_Atom were found to
contain potential XML eXternal Entity (XXE) vectors due to insecure usage of
PHP's DOM extension. External entities could be specified by adding a specific
DOCTYPE element to feeds; exploiting this vulnerability could
coerce opening arbitrary files and/or TCP connections.
A similar issue was fixed for 1.11.13 and 1.12.0, in the
Zend_Feed::import() factory method; however, the reporter of
the issue discovered that the individual classes contained similar
functionality in their constructors which remained vulnerable.
A patch was applied that removes the XXE vector by calling
libxml_disable_entity_loader() before attempting to parse the feed via
If you are using any of the components listed, and, in particular, were directly instantiating them, we recommend upgrading to either version 1.11.15 or 1.12.1 or greater.
The Zend Framework team thanks the following for identifying the issues and working with us to help protect its users:
- Yury Dyachenko at Positive Research Center
Reporting Potential Security Issues
If you have encountered a potential security vulnerability in Zend Framework, please report it to us at firstname.lastname@example.org. We will work with you to verify the vulnerability and patch it.
When reporting issues, please provide the following information:
- Component(s) affected
- A description indicating how to reproduce the issue
- A summary of the security vulnerability and impact
We request that you contact us via the email address above and give the project contributors a chance to resolve the vulnerability and issue a new release prior to any public exposure; this helps protect Zend Framework users and provides them with a chance to upgrade and/or update in order to protect their applications.
For sensitive email communications, please use our PGP key.
Zend Framework takes security seriously. If we verify a reported security vulnerability, our policy is:
- We will patch the current release branch, as well as the immediate prior minor release branch.
- After patching the release branches, we will immediately issue new security fix releases for each patched release branch.
- A security advisory will be released on the Zend Framework site detailing the vulnerability, as well as recommendations for end-users to protect themselves. Security advisories will be listed at http://framework.zend.com/security/advisories, as well as via a feed (which is also present in the website head for easy feed discovery)