TITLE:
Sun Java JAXP Nested Entity Definitions Denial of Service

SECUNIA ADVISORY ID:
SA9797

VERIFY ADVISORY:
http://www.secunia.com/advisories/9797/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
From remote

SOFTWARE:
Sun Java JRE 1.3.x
Sun Java JRE 1.4.x
Sun Java SDK 1.3.x
Sun Java SDK 1.4.x

DESCRIPTION:
A vulnerability has been identified in Sun Java, which can be
exploited by malicious people to cause a Denial of Service.

The problem is that JAXP can't handle XML documents with deeply
nested entity definitions. This can be exploited to consume 100% CPU
resources by users with access to Java based applications which
accepts and parses XML documents.

An example document has been provided in the original advisory.

All versions prior to 1.4.2_01 are vulnerable.

SOLUTION:
Version 1.4.2_01 is not vulnerable to this issue.
http://java.sun.com/j2se/1.4.2/download.html

ORIGINAL ADVISORY:
http://java.sun.com/j2se/1.4.2/relnotes.html#JAXP_security

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