cve/2013/CVE-2013-0340.md

CVE-2013-0340

Description

expat 2.1.0 and earlier 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.

POC

Reference

• http://seclists.org/fulldisclosure/2021/Sep/33
• http://seclists.org/fulldisclosure/2021/Sep/34
• http://seclists.org/fulldisclosure/2021/Sep/35
• http://seclists.org/fulldisclosure/2021/Sep/38
• http://seclists.org/fulldisclosure/2021/Sep/39

Github

• https://github.com/ARPSyndicate/cvemon
• https://github.com/NathanielAPawluk/sec-buddy
• https://github.com/fokypoky/places-list
• https://github.com/tiran/defusedxml
• https://github.com/vulsio/gost