Openpyxl 2.4.1 resolves external entities by default, which allows remote attackers to conduct XXE attacks via a crafted .xlsx document.
Weakness
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.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openpyxl | Python | 2.4.1 (including) | 2.4.1 (including) |
| Openpyxl | Ubuntu | artful | * |
| Openpyxl | Ubuntu | esm-apps/xenial | * |
| Openpyxl | Ubuntu | precise | * |
| Openpyxl | Ubuntu | upstream | * |
| Openpyxl | Ubuntu | xenial | * |
| Openpyxl | Ubuntu | yakkety | * |
| Openpyxl | Ubuntu | zesty | * |
Potential Mitigations
Related Attack Patterns
References
- http://www.openwall.com/lists/oss-security/2017/02/07/5
- https://bitbucket.org/openpyxl/openpyxl/commits/3b4905f428e1
- https://bitbucket.org/openpyxl/openpyxl/issues/749
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854442
- http://www.openwall.com/lists/oss-security/2017/02/07/5
- https://bitbucket.org/openpyxl/openpyxl/commits/3b4905f428e1
- https://bitbucket.org/openpyxl/openpyxl/issues/749
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854442