[UNIX] Java Virtual Machine Symlink Vulnerability (jpsock)

From: SecuriTeam (support_at_securiteam.com)
Date: 06/09/03

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Date: 9 Jun 2003 21:10:50 +0200

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      Java Virtual Machine Symlink Vulnerability (jpsock)
    ------------------------------------------------------------------------

    SUMMARY

    The Java virtual machine is "the cornerstone of the Java and Java 2
    platforms. It is the component of the technology responsible for its
    hardware- and operating system- independence, the small size of its
    compiled code, and its ability to protect users from malicious programs".
    Java Virtual Machine stores temporary log files within the /tmp directory
    with a prefix of jpsock.**_* etc in an insecure manner.

    DETAILS

    Due to a vulnerability Java Virtual Machine creates the file
    "/tmp/jpsock.**_*" on startup. The existence and owner of the file is not
    checked prior to writing startup information to the file.

    Impact:
    Local users may create a symlink from an arbitrary file to
    /tmp/jpsock.**_*. When JVM is executed, the file pointed to by the symlink
    will be overwritten.

    This can and will be used to gain elevated privileges via symlink attack.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:meme-boi@nothotmail.org>
    meme-boi.

    ========================================

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