mozilla: multiple vulnerabilities

- CVE-2017-5374 (arbitrary code execution): Several memory safety bugs have been found in Firefox < 51. 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.

- CVE-2017-5377 (arbitrary code execution): A memory corruption vulnerability in Skia that can occur when using transforms to make gradients, resulting in a potentially exploitable crash.

- CVE-2017-5379 (arbitrary code execution): A use-after-free vulnerability has been found in Firefox < 51, in Web Animations, when interacting with cycle collection.

- CVE-2017-5381 (arbitrary file overwrite): The "export" function in the Firefox < 51 Certificate Viewer can force local filesystem navigation when the "common name" in a certificate contains slashes, allowing certificate content to be saved in unsafe locations with an arbitrary filename.

- CVE-2017-5382 (information disclosure): Feed preview for RSS feeds in Firefox < 51 can be used to capture errors and exceptions generated by privileged content, allowing for the exposure of internal information not meant to be seen by web content.

- CVE-2017-5384 (information disclosure): Proxy Auto-Config (PAC) files in Firefox < 51 can specify a JavaScript function called for all URL requests with the full URL path which exposes more information than would be sent to the proxy itself in the case of HTTPS. Normally the Proxy Auto-Config file is specified by the user or machine owner and presumed to be non-malicious, but if a user has enabled Web Proxy Auto Detect (WPAD) this file can be served remotely.

- CVE-2017-5385 (information disclosure): In Firefox < 51, data sent with in multipart channels, such as the multipart/x-mixed-replace MIME type, will ignore the referrer-policy response header, leading to potential information disclosure for sites using this header.

- CVE-2017-5387 (information disclosure) The existence of a specifically requested local file can be found in Firefox < 51 due to the double firing of the onerror when the source attribute on a <track> tag refers to a file that does not exist if the source page is loaded locally.

- CVE-2017-5388 (denial of service): In Firefox < 51, a STUN server in conjunction with a large number of webkitRTCPeerConnection objects can be used to send large STUN packets in a short period of time due to a lack of rate limiting being applied on e10s systems, allowing for a denial of service attack.

- CVE-2017-5389 (access restriction bypass): WebExtensions in Firefox < 51 could use the mozAddonManager API by modifying the CSP headers on sites with the appropriate permissions and then using host requests to redirect script loads to a malicious site. This allows a malicious extension to then install additional extensions without explicit user permission.

- CVE-2017-5391 (privilege escalation): In Firefox < 51, special about: pages used by web content, such as RSS feeds, can load privileged about: pages in an iframe. If a content- injection bug were found in one of those pages this could allow for potential privilege escalation.

- CVE-2017-5393 (access restriction bypass): The mozAddonManager in Firefox < 51 allows for the installation of extensions from the CDN for addons.mozilla.org, a publicly accessible site. This could allow malicious extensions to install additional extensions from the CDN in combination with an XSS attack on Mozilla AMO sites.