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CVSS: 7.5EPSS: 1%CPEs: 6EXPL: 0

During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer. This saved data is used for later messages but in some cases, the handshake transcript can exceed the space available in the current buffer, causing the allocation of a new buffer. This leaves a pointer pointing to the old, freed buffer, resulting in a use-after-free when handshake hashes are then calculated afterwards. This can result in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4. • http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html http://www.securityfocus.com/bid/101059 http://www.securitytracker.com/id/1039465 https://access.redhat.com/errata/RHSA-2017:2832 https://bugzilla.mozilla.org/show_bug.cgi?id=1377618 https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html https://security.gentoo.org/glsa/201803-14 https://www.debian.org/security/2017/dsa-3987 https://www.debian.org/security/2017/dsa-3998 https://www.debia • CWE-416: Use After Free •

CVSS: 10.0EPSS: 0%CPEs: 17EXPL: 0

Memory safety bugs were reported in Firefox 55 and Firefox ESR 52.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4. Se han informado de errores de seguridad de memoria en Firefox 55 y Firefox ESR 52.3. Algunos de estos errores mostraron evidencias de corrupción de memoria y se cree que, con el esfuerzo necesario, se podrían explotar para ejecutar código arbitrario. • http://www.securityfocus.com/bid/101054 http://www.securitytracker.com/id/1039465 https://access.redhat.com/errata/RHSA-2017:2831 https://access.redhat.com/errata/RHSA-2017:2885 https://bugzilla.mozilla.org/buglist.cgi?bug_id=1386787%2C1389974%2C1371657%2C1360334%2C1390550%2C1380824%2C1387918%2C1395598 https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html https://security.gentoo.org/glsa/201803-14 https://usn.ubuntu.com/3688-1 https://www.debian.org/security/2017/dsa-3987&# • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer CWE-122: Heap-based Buffer Overflow •

CVSS: 9.8EPSS: 2%CPEs: 15EXPL: 0

A buffer overflow occurs when drawing and validating elements with the ANGLE graphics library, used for WebGL content. This is due to an incorrect value being passed within the library during checks and results in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4. Ocurre un desbordamiento de búfer cuando se dibujan y validan elementos con la librería de gráficos ANGLE, utilizado para contenidos WebGL. Esto se debe a que se pasa un valor incorrecto en la librería durante las comprobaciones y resulta en un cierre inesperado potencialmente explotable. • http://www.securityfocus.com/bid/101053 http://www.securitytracker.com/id/1039465 https://access.redhat.com/errata/RHSA-2017:2831 https://access.redhat.com/errata/RHSA-2017:2885 https://bugzilla.mozilla.org/show_bug.cgi?id=1398381 https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html https://security.gentoo.org/glsa/201803-14 https://www.debian.org/security/2017/dsa-3987 https://www.debian.org/security/2017/dsa-4014 https://www.mozilla.org/security/advisor • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') •

CVSS: 6.1EPSS: 0%CPEs: 15EXPL: 1

The content security policy (CSP) "sandbox" directive did not create a unique origin for the document, causing it to behave as if the "allow-same-origin" keyword were always specified. This could allow a Cross-Site Scripting (XSS) attack to be launched from unsafe content. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4. La directiva CSP (Content Security Policy) "sandbox" no creaba un origen único para el documento, provocando que se comporte como si estuviera siempre especificada la palabra clave "allow-same-origin". Esto podría permitir que se lance un ataque Cross-Site Scripting (XSS) desde contenido no seguro. • http://www.securityfocus.com/bid/101059 http://www.securitytracker.com/id/1039465 https://access.redhat.com/errata/RHSA-2017:2831 https://access.redhat.com/errata/RHSA-2017:2885 https://bugzilla.mozilla.org/show_bug.cgi?id=1396320 https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html https://security.gentoo.org/glsa/201803-14 https://www.debian.org/security/2017/dsa-3987 https://www.debian.org/security/2017/dsa-4014 https://www.mozilla.org/security/advisor • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') •

CVSS: 9.8EPSS: 0%CPEs: 16EXPL: 1

A use-after-free vulnerability can occur when manipulating arrays of Accessible Rich Internet Applications (ARIA) elements within containers through the DOM. This results in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4. Puede ocurrir una vulnerabilidad de uso de memoria previamente liberada cuando se manipulan arrays de elementos ARIA (Accesible Rich Internet Applications) en los contenedores mediante el DOM. Esto resulta en un cierre inesperado explotable. • http://www.securityfocus.com/bid/101055 http://www.securitytracker.com/id/1039465 https://access.redhat.com/errata/RHSA-2017:2831 https://access.redhat.com/errata/RHSA-2017:2885 https://bugzilla.mozilla.org/show_bug.cgi?id=1363723 https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html https://security.gentoo.org/glsa/201803-14 https://www.debian.org/security/2017/dsa-3987 https://www.debian.org/security/2017/dsa-4014 https://www.mozilla.org/security/advisor • CWE-416: Use After Free •