Bug 1568520 – CVE-2018-2826 OpenJDK: incorrect type check for the MethodHandles' tryFinally cleanup exception type (Libraries, 8194238)

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Bug 1568520 - (CVE-2018-2826) CVE-2018-2826 OpenJDK: incorrect type check for the MethodHandles' tryFinally cleanup exception type (Libraries, 8194238)

Summary:	CVE-2018-2826 OpenJDK: incorrect type check for the MethodHandles' tryFinally...

Status:	CLOSED NOTABUG

Aliases:	CVE-2018-2826

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	urgent Severity urgent
Target Milestone:	---
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Assigned To:	Red Hat Product Security
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URL:
Whiteboard:	impact=critical,public=20180417,repor...
Keywords:	Security

Depends On:
Blocks:	1559778
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Reported:	2018-04-17 12:47 EDT by Tomas Hoger
Modified:	2018-05-15 17:09 EDT (History)
CC List:	3 users (show)

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Last Closed:	2018-04-17 16:27:21 EDT
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Description Tomas Hoger 2018-04-17 12:47:16 EDT

It was discovered that the Libraries component of OpenJDK failed to correctly check type of the exception passed to the cleanup handle when using MethodHandles' tryFinally() method.  An untrusted Java application or applet could use this flaw to bypass Java sandbox restrictions.

Comment 1 Tomas Hoger 2018-04-17 16:27:21 EDT

Affected functionality - MethodHandles' tryFinally() method - was only introduced in OpenJDK 9.

Comment 2 Tomas Hoger 2018-04-17 17:01:47 EDT

Public now via Oracle CPU April 2018:

http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html#AppendixJAVA

The issue was fixed in Oracle JDK 10.0.1.

Comment 3 Tomas Hoger 2018-04-20 16:49:56 EDT

OpenJDK 10 upstream commit:

http://hg.openjdk.java.net/jdk-updates/jdk10u/rev/c78afd5995fb

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