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CVSS: 5.5EPSS: 0%CPEs: 3EXPL: 0

The Mozilla Maintenance Service "helper.exe" application creates a temporary directory writable by non-privileged users. When this is combined with creation of a junction (a form of symbolic link), protected files in the target directory of the junction can be deleted by the Mozilla Maintenance Service, which has privileged access. Note: This attack requires local system access and only affects Windows. Other operating systems are not affected. This vulnerability affects Firefox ESR < 52.2 and Firefox < 54. • http://www.securityfocus.com/bid/99057 http://www.securitytracker.com/id/1038689 https://bugzilla.mozilla.org/show_bug.cgi?id=1215648 https://sourceforge.net/p/nsis/bugs/1125 https://www.mozilla.org/security/advisories/mfsa2017-15 https://www.mozilla.org/security/advisories/mfsa2017-16 • CWE-276: Incorrect Default Permissions •

CVSS: 5.5EPSS: 0%CPEs: 3EXPL: 0

The Mozilla Maintenance Service can be invoked by an unprivileged user to read 32 bytes of any arbitrary file on the local system by convincing the service that it is reading a status file provided by the Mozilla Windows Updater. The Mozilla Maintenance Service executes with privileged access, bypassing system protections against unprivileged users. Note: This attack requires local system access and only affects Windows. Other operating systems are not affected. This vulnerability affects Firefox ESR < 52.2 and Firefox < 54. • http://www.securityfocus.com/bid/99057 http://www.securitytracker.com/id/1038689 https://bugzilla.mozilla.org/show_bug.cgi?id=1336979 https://www.mozilla.org/security/advisories/mfsa2017-15 https://www.mozilla.org/security/advisories/mfsa2017-16 • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor •

CVSS: 7.8EPSS: 0%CPEs: 3EXPL: 1

The Mozilla Windows updater modifies some files to be updated by reading the original file and applying changes to it. The location of the original file can be altered by a malicious user by passing a special path to the callback parameter through the Mozilla Maintenance Service, allowing the manipulation of files in the installation directory and privilege escalation by manipulating the Mozilla Maintenance Service, which has privileged access. Note: This attack requires local system access and only affects Windows. Other operating systems are not affected. This vulnerability affects Firefox ESR < 52.2 and Firefox < 54. • http://www.securityfocus.com/bid/99057 http://www.securitytracker.com/id/1038689 https://bugzilla.mozilla.org/show_bug.cgi?id=1348645 https://www.mozilla.org/security/advisories/mfsa2017-15 https://www.mozilla.org/security/advisories/mfsa2017-16 • CWE-417: Communication Channel Errors •

CVSS: 5.3EPSS: 0%CPEs: 4EXPL: 0

An error in the "WindowsDllDetourPatcher" where a RWX ("Read/Write/Execute") 4k block is allocated but never protected, violating DEP protections. Note: This attack only affects Windows operating systems. Other operating systems are not affected. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55. Error en "WindowsDllDetourPatcher", donde un bloque 4k RWX ("Read/Write/Execute") se asigna, pero nunca se proteje, violando las protecciones DEP. • http://www.securityfocus.com/bid/100243 http://www.securitytracker.com/id/1039124 https://bugzilla.mozilla.org/show_bug.cgi?id=1344034 https://www.mozilla.org/security/advisories/mfsa2017-18 https://www.mozilla.org/security/advisories/mfsa2017-19 https://www.mozilla.org/security/advisories/mfsa2017-20 • CWE-269: Improper Privilege Management •

CVSS: 7.5EPSS: 0%CPEs: 5EXPL: 0

In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the "SEE_MASK_FLAG_NO_UI" flag associated with downloaded files and will not show any UI. Files that are unknown and potentially dangerous will be allowed to run because SmartScreen will not prompt the user for a decision, and if the user is offline all files will be allowed to be opened because Windows won't prompt the user to ask what to do. Firefox incorrectly sets this flag when downloading files, leading to less secure behavior from SmartScreen. Note: this issue only affects Windows 10 users running the April 2018 update or later. It does not affect other Windows users or other operating systems. • http://www.securityfocus.com/bid/104136 http://www.securitytracker.com/id/1040896 https://bugzilla.mozilla.org/show_bug.cgi?id=1447080 https://www.mozilla.org/security/advisories/mfsa2018-11 https://www.mozilla.org/security/advisories/mfsa2018-12 https://www.mozilla.org/security/advisories/mfsa2018-13 •