Security update for webkit2gtk3

Open Source Vulnerabilities SUSE-SU-2018:2752-1

This update for webkit2gtk3 to version 2.20.5 fixes the following issues: Security issue fixed: - CVE-2018-12911: Fix off-by-one in xdg_mime_get_simple_globs (bsc#1101999). - CVE-2018-4261, CVE-2018-4262, CVE-2018-4263, CVE-2018-4264, CVE-2018-4265, CVE-2018-4267, CVE-2018-4272, CVE-2018-4284: Processing maliciously crafted web content may lead to arbitrary code execution. A memory corruption issue was addressed with improved memory handling. - CVE-2018-4266: A malicious website may be able to cause a denial of service. A race condition was addressed with additional validation. - CVE-2018-4270, CVE-2018-4271, CVE-2018-4273: Processing maliciously crafted web content may lead to an unexpected application crash. A memory corruption issue was addressed with improved input validation. - CVE-2018-4278: A malicious website may exfiltrate audio data cross-origin. Sound fetched through audio elements may be exfiltrated cross-origin. This issue was addressed with improved audio taint tracking. Other bugs fixed: - Fix rendering artifacts in some web sites due to a bug introduced in 2.20.4. - Fix a crash when leaving accelerated compositing mode. - Fix non-deterministic build failure due to missing JavaScriptCore/JSContextRef.h.