From the Mozilla Security Center page for Firefox 20:
Andrew McCreight, Randell Jesup, Gary Kwong, Jesse Ruderman, Christian Holler, and Mats Palmgren reported memory safety problems and crashes that affect Firefox 19. (CVE-2013-0789)
Mozilla community member Ambroz Bizjak reported an out-of-bounds array read in the CERT_DecodeCertPackage function of the Network Security Services (NSS) libary when decoding a certificate. When this occurs, it will lead to memory corruption and a non-exploitable crash. (CVE-2013-0791)
Mozilla community member Tobias Schula reported that if gfx.color_management.enablev4 preference is enabled manually in about:config, some grayscale PNG images will be rendered incorrectly and cause memory corruption during PNG decoding when certain color profiles are in use. A crafted PNG image could use this flaw to leak data through rendered images drawing from random memory. By default, this preference is not enabled. (CVE-2013-0792)
Security researcher shutdown reported a method for removing the origin indication on tab-modal dialog boxes in combination with browser navigation. This could allow an attacker's dialog to overlay a page and show another site's content. This can be used for phishing by allowing users to enter data into a modal prompt dialog on an attacking, site while appearing to be from the displayed site. (CVE-2013-0794) | 