A flaw was found in the Java refection API in the handling of access privileges of proxy classes. An untrusted Java application or applet could use this flaw to bypass Java sandbox restrictions. External Reference: http://www.oracle.com/technetwork/topics/security/javacpufeb2013-1841061.html
Upstream commit, as included in IcedTea7 repositories: http://icedtea.classpath.org/hg/release/icedtea7-forest-2.3/jdk/rev/c9534e095b37
Additional details from Adam Gowdiak of Security Explorations: http://seclists.org/fulldisclosure/2013/Feb/12 [Issue 29] This issue allows for the creation of arbitrary Proxy objects for interfaces defined in restricted packages. Proxy objects defined in a NULL class loader namespaces are of a particular interest here. Such objects can be used to manipulate instances of certain restricted classes. In our Proof of Concept code we create such a proxy object for the com.sun.xml.internal.bind.v2.model.nav.Navigator interface. In order to use the aforementioned proxy object, we need an instance of that interface too. We obtain it with the help of Issue 28, which allows to access arbitrary field objects from restricted classes and interfaces. As a result, by combining Issue 27-29, one can use Navigator interface and make use of its sensitive Reflection API functionality such as obtaining access to methods of arbitrary classes. That condition can be further leveraged to obtain a complete JVM security bypass. Please, note that our Proof of Concept code for Issues 27-29 was reported to Oracle in Apr 2012 and depending Issues 27-28 were addressed by the company sooner than Issue 29. Testing of the PoC will thus give best results on older versions of Java SE 7. Original report: http://www.security-explorations.com/materials/SE-2012-01-ORACLE-4.pdf
This issue has been addressed in following products: Supplementary for Red Hat Enterprise Linux 5 Supplementary for Red Hat Enterprise Linux 6 Via RHSA-2013:0237 https://rhn.redhat.com/errata/RHSA-2013-0237.html
This issue has been addressed in following products: Supplementary for Red Hat Enterprise Linux 5 Supplementary for Red Hat Enterprise Linux 6 Via RHSA-2013:0236 https://rhn.redhat.com/errata/RHSA-2013-0236.html
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Via RHSA-2013:0246 https://rhn.redhat.com/errata/RHSA-2013-0246.html
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Red Hat Enterprise Linux 6 Via RHSA-2013:0247 https://rhn.redhat.com/errata/RHSA-2013-0247.html
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2013:0245 https://rhn.redhat.com/errata/RHSA-2013-0245.html
Fixed in upstream IcedTea versions IcedTea6 1.11.6, and 1.12.1, and IcedTea7 2.1.5, 2.2.5, and 2.3.6: http://mail.openjdk.java.net/pipermail/distro-pkg-dev/2013-February/021708.html http://mail.openjdk.java.net/pipermail/distro-pkg-dev/2013-February/021728.html http://mail.openjdk.java.net/pipermail/distro-pkg-dev/2013-February/021905.html http://mail.openjdk.java.net/pipermail/distro-pkg-dev/2013-February/021876.html Note that version 2.3.5 was tagged in upstream mercurial including the security fixes, but was not released. Only 2.3.6 was released, correcting problem introduced by security patches as included in 2.3.5.
This issue has been addressed in following products: Supplementary for Red Hat Enterprise Linux 5 Supplementary for Red Hat Enterprise Linux 6 Via RHSA-2013:0624 https://rhn.redhat.com/errata/RHSA-2013-0624.html
This issue has been addressed in following products: Supplementary for Red Hat Enterprise Linux 5 Supplementary for Red Hat Enterprise Linux 6 Via RHSA-2013:0626 https://rhn.redhat.com/errata/RHSA-2013-0626.html
This issue has been addressed in following products: Supplementary for Red Hat Enterprise Linux 5 Supplementary for Red Hat Enterprise Linux 6 Via RHSA-2013:0625 https://rhn.redhat.com/errata/RHSA-2013-0625.html
This issue has been addressed in following products: Red Hat Network Satellite Server v 5.5 Via RHSA-2013:1456 https://rhn.redhat.com/errata/RHSA-2013-1456.html
This issue has been addressed in following products: Red Hat Network Satellite Server v 5.4 Via RHSA-2013:1455 https://rhn.redhat.com/errata/RHSA-2013-1455.html