CVSS: 7.8EPSS: 50%CPEs: 19EXPL: 1CVE-2018-20843 – expat: large number of colons in input makes parser consume high amount of resources, leading to DoS
https://notcve.org/view.php?id=CVE-2018-20843
In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks). En libexpat en Expat anterior a versión 2.2.7, una entrada XML incluyendo nombres XML que contienen una gran cantidad de "dos puntos", podría hacer que el analizador XML consuma una gran cantidad de recursos de RAM y CPU durante el procesamiento (lo suficiente como para ser utilizables en ataques de denegación de servicio) . It was discovered that the "setElementTypePrefix()" function incorrectly extracted XML namespace prefixes. By tricking an application into processing a specially crafted XML file, an attacker could cause unusually high consumption of memory resources and possibly lead to a denial of service. • http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226 https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes https://github.com/libexpat/libexpat/issues/186 https://github.com/libexpat/libexpat/pull/262 https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6 https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html https://lists.fedoraproject.org/archives/ • CWE-400: Uncontrolled Resource Consumption CWE-611: Improper Restriction of XML External Entity Reference •
CVSS: 7.5EPSS: 0%CPEs: 9EXPL: 1CVE-2017-9233
https://notcve.org/view.php?id=CVE-2017-9233
XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD. Una vulnerabilidad de XML External Entity (XEE) en libexpat versión 2.2.0 y anteriores (Expat XML Parser Library) permite que los atacantes consigan que el analizador entre en un bucle infinito utilizando una definición de entidad externa mal formada desde una DTD externa. • http://www.debian.org/security/2017/dsa-3898 http://www.openwall.com/lists/oss-security/2017/06/17/7 http://www.securityfocus.com/bid/99276 http://www.securitytracker.com/id/1039427 https://github.com/libexpat/libexpat/blob/master/expat/Changes https://libexpat.github.io/doc/cve-2017-9233 https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40% • CWE-611: Improper Restriction of XML External Entity Reference CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') •
CVSS: 8.1EPSS: 1%CPEs: 8EXPL: 0CVE-2016-4472
https://notcve.org/view.php?id=CVE-2016-4472
The overflow protection in Expat is removed by compilers with certain optimization settings, which allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via crafted XML data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-1283 and CVE-2015-2716. La protección de desbordamiento en Expat es eliminada por los compiladores con ciertos ajustes de optimización, lo que permite a atacantes remotos provocar una denegación de servicio (caída) o posiblemente ejecutar código arbitrario a través de datos XML manipulados. NOTA: esta vulnerabilidad existe debido a una solución incompleta para CVE-2015-1283 y CVE-2015-2716. • http://www.securityfocus.com/bid/91528 http://www.ubuntu.com/usn/USN-3013-1 https://bugzilla.redhat.com/show_bug.cgi?id=1344251 https://kc.mcafee.com/corporate/index?page=content&id=SB10365 https://security.gentoo.org/glsa/201701-21 https://sourceforge.net/p/expat/code_git/ci/f0bec73b018caa07d3e75ec8dd967f3785d71bde https://www.tenable.com/security/tns-2016-20 • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer •
CVSS: 7.8EPSS: 0%CPEs: 11EXPL: 0CVE-2016-5300
https://notcve.org/view.php?id=CVE-2016-5300
The XML parser in Expat does not use sufficient entropy for hash initialization, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted identifiers in an XML document. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-0876. El intérprete XML en Expat no utiliza suficiente entropía para inicialización hash, lo que permite a atacantes dependientes del contexto provocar una denegación de servicio (consumo de CPU) a través de identificadores manipulados en un documento XML. NOTA: esta vulnerabilidad existe debido a una solución incompleta para CVE-2012-0876. • http://www.debian.org/security/2016/dsa-3597 http://www.openwall.com/lists/oss-security/2016/06/04/4 http://www.openwall.com/lists/oss-security/2016/06/04/5 http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html http://www.securityfocus.com/bid/91159 http://www.ubuntu.com/usn/USN-3010-1 https://kc.mcafee.com/corporate/index?page=content&id=SB10365 https://lists.apache.org • CWE-399: Resource Management Errors •
CVSS: 5.9EPSS: 0%CPEs: 11EXPL: 0CVE-2012-6702
https://notcve.org/view.php?id=CVE-2012-6702
Expat, when used in a parser that has not called XML_SetHashSalt or passed it a seed of 0, makes it easier for context-dependent attackers to defeat cryptographic protection mechanisms via vectors involving use of the srand function. Expat, cuando se utiliza en un intérprete que no ha realizado una llamada XML_SetHashSalt o pasado una semilla de 0, facilita a atacantes dependientes del contexto romper mecanismos de protección criptográfica a través de vectores que involucran el uso de la función srand. • http://www.debian.org/security/2016/dsa-3597 http://www.openwall.com/lists/oss-security/2016/06/03/8 http://www.openwall.com/lists/oss-security/2016/06/04/1 http://www.securityfocus.com/bid/91483 http://www.ubuntu.com/usn/USN-3010-1 https://security.gentoo.org/glsa/201701-21 https://source.android.com/security/bulletin/2016-11-01.html https://www.tenable.com/security/tns-2016-20 • CWE-310: Cryptographic Issues •