Explain CVE-2013-0340
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.
Affected Products: n/a
References: [{'name': '[oss-security] 20130221 CVEs for libxml2 and expat internal and external XML entity expansion', 'tags': ['mailing-list', 'x_refsource_MLIST'], 'url': 'http://openwall.com/lists/oss-security/2013/02/22/3'}, {'name': '[oss-security] 20130413 Re-evaluating expat/libxml2 CVE assignments', 'tags': ['mailing-list', 'x_refsource_MLIST'], 'url': 'http://www.openwall.com/lists/oss-security/2013/04/12/6'}, {'name': '90634', 'tags': ['vdb-entry', 'x_refsource_OSVDB'], 'url': 'http://www.osvdb.org/90634'}, {'name': '1028213', 'tags': ['vdb-entry', 'x_refsource_SECTRACK'], 'url': 'http://securitytracker.com/id?1028213'}, {'name': 'GLSA-201701-21', 'tags': ['vendor-advisory', 'x_refsource_GENTOO'], 'url': 'https://security.gentoo.org/glsa/201701-21'}, {'name': '58233', 'tags': ['vdb-entry', 'x_refsource_BID'], 'url': 'http://www.securityfocus.com/bid/58233'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://support.apple.com/kb/HT212805'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://support.apple.com/kb/HT212804'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://support.apple.com/kb/HT212807'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://support.apple.com/kb/HT212819'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://support.apple.com/kb/HT212814'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://support.apple.com/kb/HT212815'}, {'name': '20210921 APPLE-SA-2021-09-20-1 iOS 15 and iPadOS 15', 'tags': ['mailing-list', 'x_refsource_FULLDISC'], 'url': 'http://seclists.org/fulldisclosure/2021/Sep/33'}, {'name': '20210921 APPLE-SA-2021-09-20-2 watchOS 8', 'tags': ['mailing-list', 'x_refsource_FULLDISC'], 'url': 'http://seclists.org/fulldisclosure/2021/Sep/34'}, {'name': '20210921 APPLE-SA-2021-09-20-8 Additional information for APPLE-SA-2021-09-13-4 Security Update 2021-005 Catalina', 'tags': ['mailing-list', 'x_refsource_FULLDISC'], 'url': 'http://seclists.org/fulldisclosure/2021/Sep/40'}, {'name': '20210921 APPLE-SA-2021-09-20-3 tvOS 15', 'tags': ['mailing-list', 'x_refsource_FULLDISC'], 'url': 'http://seclists.org/fulldisclosure/2021/Sep/35'}, {'name': '20210921 APPLE-SA-2021-09-20-6 Additional information for APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8', 'tags': ['mailing-list', 'x_refsource_FULLDISC'], 'url': 'http://seclists.org/fulldisclosure/2021/Sep/38'}, {'name': '20210921 APPLE-SA-2021-09-20-7 Additional information for APPLE-SA-2021-09-13-3 macOS Big Sur 11.6', 'tags': ['mailing-list', 'x_refsource_FULLDISC'], 'url': 'http://seclists.org/fulldisclosure/2021/Sep/39'}, {'name': '[announce] 20211007 CVE-2021-40439: Apache OpenOffice: Billion Laughs', 'tags': ['mailing-list', 'x_refsource_MLIST'], 'url': 'https://lists.apache.org/thread.html/r41eca5f4f09e74436cbb05dec450fc2bef37b5d3e966aa7cc5fada6d%40%3Cannounce.apache.org%3E'}, {'name': '[openoffice-users] 20211007 CVE-2021-40439: Apache OpenOffice: Billion Laughs', 'tags': ['mailing-list', 'x_refsource_MLIST'], 'url': 'https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E'}, {'name': '[oss-security] 20211007 CVE-2021-40439: Apache OpenOffice: Billion Laughs', 'tags': ['mailing-list', 'x_refsource_MLIST'], 'url': 'http://www.openwall.com/lists/oss-security/2021/10/07/4'}, {'name': '20211027 APPLE-SA-2021-10-26-10 Additional information for APPLE-SA-2021-09-20-2 watchOS 8', 'tags': ['mailing-list', 'x_refsource_FULLDISC'], 'url': 'http://seclists.org/fulldisclosure/2021/Oct/62'}, {'name': '20211027 APPLE-SA-2021-10-26-11 Additional information for APPLE-SA-2021-09-20-3 tvOS 15', 'tags': ['mailing-list', 'x_refsource_FULLDISC'], 'url': 'http://seclists.org/fulldisclosure/2021/Oct/63'}, {'name': '20211027 APPLE-SA-2021-10-26-9 Additional information for APPLE-SA-2021-09-20-1 iOS 15 and iPadOS 15', 'tags': ['mailing-list', 'x_refsource_FULLDISC'], 'url': 'http://seclists.org/fulldisclosure/2021/Oct/61'}]
CVE State: PUBLISHED