GLSA-200705-20 : Blackdown Java: Applet privilege escalation
High Nessus Plugin ID 25341
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-200705-20 (Blackdown Java: Applet privilege escalation)
Chris Evans has discovered multiple buffer overflows in the Sun JDK and the Sun JRE possibly related to various AWT and font layout functions.
Tom Hawtin has discovered an unspecified vulnerability in the Sun JDK and the Sun JRE relating to unintended applet data access. He has also discovered multiple other unspecified vulnerabilities in the Sun JDK and the Sun JRE allowing unintended Java applet or application resource acquisition. Additionally, a memory corruption error has been found in the handling of GIF images with zero width field blocks.
An attacker could entice a user to run a specially crafted Java applet or application that could read, write, or execute local files with the privileges of the user running the JVM, access data maintained in other Java applets, or escalate the privileges of the currently running Java applet or application allowing for unauthorized access to system resources.
Disable the 'nsplugin' USE flag in order to prevent web applets from being run.
SolutionSince there is no fixed update from Blackdown and since the flaw only occurs in the applets, the 'nsplugin' USE flag has been masked in the portage tree. Emerge the ebuild again in order to fix the vulnerability. Another solution is to switch to another Java implementation such as the Sun implementation (dev-java/sun-jdk and dev-java/sun-jre-bin).
# emerge --sync # emerge --ask --oneshot --verbose 'dev-java/blackdown-jdk' # emerge --ask --oneshot --verbose 'dev-java/blackdown-jre'