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47 lines
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2 KiB
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Critical Mac OS X Java Vulnerabilities
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Introduction
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Five months ago, CVE-2008-5353 and other vulnerabilities were publicly
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disclosed, and fixed by Sun.
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CVE-2008-5353 allows malicious code to escape the Java sandbox and run
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arbitrary commands with the permissions of the executing user. This may
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result in untrusted Java applets executing arbitrary code merely by
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visiting a web page hosting the applet. The issue is trivially
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exploitable.
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Unfortunately, these vulnerabilities remain in Apple's shipping JVMs, as
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well as Soylatte 1.0.3. As Soylatte does not provide browser plugins,
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the impact of the vulnerability is reduced. The recent release of
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OpenJDK6/Mac OS X is not affected by CVE-2008-5353.
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Work-Arounds
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* Mac OS X users should disable Java applets in their browsers and
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disable 'Open "safe" files after downloading' in Safari.
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* Soylatte users running untrusted code should upgrade to an
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OpenJDK6-based release, where possible. No future releases of the
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JRL-based Soylatte branch are planned at this time. If this is an
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issue for you, please feel free to contact me.
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* No work-around is available for users otherwise running Java
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untrusted code.
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Proof of Concept
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Unfortunately, it seems that many Mac OS X security issues are ignored
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if the severity of the issue is not adequately demonstrated. Due to the
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fact that an exploit for this issue is available in the wild, and the
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vulnerability has been public knowledge for six months, I have decided
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to release a my own proof of concept to demonstrate the issue.
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If you visit the following page, "/usr/bin/say" will be executed on your
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system by a Java applet, with your current user permissions. This link
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will execute code on your system with your current user permissions. The
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proof of concept runs on fully-patched PowerPC and Intel Mac OS X
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systems.
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http://landonf.bikemonkey.org/static/moab-tests/CVE-2008-5353/hello.html
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compiled/decompiled: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/8753.tgz (2009-javax.tgz)
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# milw0rm.com [2009-05-20] |