(JCraft's JZlib is Also Vulnerable) Re: 'zlib' Shared Compression Library Contains 'Double Free()' Buffer Overflow That Lets Remote Users Cause Programs Using zlib to Crash or Execute Arbitrary Code
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Date: Apr 1 2002
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Impact: Denial of service via network, Execution of arbitrary code via local system, Execution of arbitrary code via network
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Fix Available: Yes
Vendor Confirmed: Yes
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Version(s): prior to 0.0.7
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Description: A vulnerability was reported in JCraft's JZlib, a Java-based implementation of the zlib shared library, a widely used library that
provides in-memory compression and decompression functions. A remote user could cause programs using this library to crash or to
execute arbitrary code on the system.
It is reported that certain types of input will cause zlib to free the same area of memory twice (i.e., perform a "double free"),
resulting in a buffer overflow condition when expanding compressed input. A remote user can cause programs that process untrusted
user-supplied compressed input to crash or potentially execute arbitrary code on the system.
It is reported that web browsers
or email programs that display image attachments or other programs that uncompress data may be particularly affected.
It is reported
that Matthias Clasen <maclas@gmx.de> and Owen Taylor <otaylor@redhat.com> discovered this bug.
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Impact: A remote user can cause affected programs that use zlib to process untrusted user-supplied compressed input to crash or potentially execute arbitrary code on the system.
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Solution: The vendor has released a fixed version of JZlib (0.0.7), available at:
http://www.jcraft.com/jzlib/
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Vendor URL: www.jcraft.com/jzlib/ (Links to External Site)
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Cause: Boundary error
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Underlying OS: Java, Windows (Any), Linux (Any), UNIX (Any)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Sat, 30 Mar 2002 21:49:39 -0500
Subject: JZLib (zlib) Denial Of Service Vulnerability
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JCraft's JZLib is a Java-based implementation of zlib.
http://www.jcraft.com/jzlib/ChangeLog
Changes since version 0.0.6:
- updated InfBlocks.java as zlib did to fix the vulnerability related to
the 'double free'. Of course, JZlib is free from such a vulnerability
like the 'double free', but JZlib had crashed with
NullPointerException
by a specially-crafted block of invalid deflated data.
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