ArchLinux: 201606-7: firefox: multiple issues

June 8, 2016

Summary

- CVE-2016-2815 (arbitrary code execution) Mozilla developers and community members reported several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be exploited to run arbitrary code.
- CVE-2016-2818 (arbitrary code execution)
Mozilla developers and community members reported several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be exploited to run arbitrary code.
- CVE-2016-2819 (arbitrary code execution)
Security researcher firehack reported a buffer overflow when parsing HTML5 fragments in a foreign context such as under an
- CVE-2016-2821 (arbitrary code execution)
Security researcher firehack used the Address Sanitizer tool to discover a use-after-free in contenteditable mode. This occurs when deleting document object model (DOM) table elements created within the editor and results in a potentially exploitable crash.
- CVE-2016-2822 (addressbar spoofing)
Security researcher Jordi Chancel reported a method to spoof the contents of the addressbar. This uses a persistent menu within a select element, which acts as a container for HTML content and can be placed in an arbitrary location. When placed over the addressbar, this can mask the true site URL, allowing for spoofing by a malicious site.
- CVE-2016-2825 (same-origin policy bypass)
Security researcher Armin Razmdjou reported that the location.host property can be set to an arbitrary string after creating an invalid data: URI. This allows for a bypass of some same-origin policy protections. This issue is mitigated by the data: URI in use and any same-origin checks for http: or https: are still enforced correctly. As a result cookie stealing and other common same-origin bypass attacks are not possible.
- CVE-2016-2828 (arbitrary code execution)
Mozilla community member jomo reported a use-after-free crash when processing WebGL content. This issue was caused by the use of a texture after its recycle pool has been destroyed during WebGL operations, which frees the memory associated with the texture. This results in a potentially exploitable crash when the texture is later called.
- CVE-2016-2829 (visual user confusion)
Security researcher Tim McCormack reported that when a page requests a series of permissions in a short timespan, the resulting permission notifications can show the icon for the wrong permission request. This can lead to user confusion and inadvertent consent given when a user is prompted by web content to give permissions, such as for geolocation or microphone access.
- CVE-2016-2831 (clickjacking)
Security researcher sushi Anton Larsson reported that when paired fullscreen and pointerlock requests are done in combination with closing windows, a pointerlock can be created within a fullscreen window without user permission. This pointerlock cannot then be cancelled without terminating the browser, resulting in a persistent denial of service attack. This can also be used for spoofing and clickjacking attacks against the browser UI.
- CVE-2016-2832 (information leakage)
Mozilla developer John Schoenick reported that CSS pseudo-classes can be used by web content to leak information on plugins that are installed but disabled. This can be used for information disclosure through a fingerprinting attack that lists all of the plugins installed by a user on a system, even when they are disabled.
- CVE-2016-2833 (cross-site scripting)
Mozilla engineer Matt Wobensmith reported that Content Security Policy (CSP) does not block the loading of cross-domain Java applets when specified by policy. This is because the Java applet is loaded by the Java plugin, which then mediates all network requests without checking against CSP. This could allow a malicious site to manipulate content through a Java applet to bypass CSP protections, allowing for possible cross-site scripting (XSS) attacks.

Resolution

Upgrade to 47.0-1. # pacman -Syu "firefox>=47.0-1"
The problems have been fixed upstream in version 47.0.

References

https://access.redhat.com/security/cve/CVE-2016-2815 https://access.redhat.com/security/cve/CVE-2016-2818 https://access.redhat.com/security/cve/CVE-2016-2819 https://access.redhat.com/security/cve/CVE-2016-2821 https://access.redhat.com/security/cve/CVE-2016-2822 https://access.redhat.com/security/cve/CVE-2016-2825 https://access.redhat.com/security/cve/CVE-2016-2828 https://access.redhat.com/security/cve/CVE-2016-2829 https://access.redhat.com/security/cve/CVE-2016-2831 https://access.redhat.com/security/cve/CVE-2016-2832 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2833 https://www.mozilla.org/en-US/security/known-vulnerabilities/firefox/#firefox47