Medium · published January 21, 2014
expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be argued that because expat already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed, and each affected application would need its own CVE.
| Product | Versions | Fixed in |
|---|---|---|
| libexpat_project/libexpat | < 2.4.0 | 2.4.0 |
| python/python | ≥ 3.6.0, < 3.6.15 | 3.6.15 |
| python/python | ≥ 3.7.0, < 3.7.12 | 3.7.12 |
| python/python | ≥ 3.8.0, < 3.8.12 | 3.8.12 |
| python/python | ≥ 3.9.0, < 3.9.7 | 3.9.7 |
| apple/ipados | < 14.8 | 14.8 |
| apple/iphone_os | < 14.8 | 14.8 |
| apple/macos | < 11.6 | 11.6 |
| apple/tvos | < 15.0 | 15.0 |
| apple/watchos | < 8.0 | 8.0 |