[UNIX] Solaris Kernel Module Insertion Local Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 03/25/04

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Date: 25 Mar 2004 16:56:54 +0200

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      Solaris Kernel Module Insertion Local Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    A vulnerability in Solaris exists which permits a local non-privileged
    user to insert a user supplied kernel module. Once a kernel module is
    successfully integrated into the kernel, it effectively gives the
    malicious user root permissions on the system.

    DETAILS

    Vulnerable Systems:
     * Solaris versions 2.6 through 10

    The loading of a user-supplied module by a non-privileged user is possible
    due to a directory traversal bug in the vfs_getvfssw() function within the
    kernel. There are two system calls which can be used in order to trigger
    this vulnerability, namely mount() and sysfs().

    Patch Availability:
    Sun has supplied a patch which mitigates the vulnerability. It can be
    found at
    <http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%2F57479&zone_32=category%3Asecurity> http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%2F57479&zone_32=category%3Asecurity.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:dave@immunitysec.com> Dave
    Aitel of Immunity Inc..

    The original article can be found at:
    <http://www.immunitysec.com/downloads/solaris_kernel_vfs.sxw.pdf>
    http://www.immunitysec.com/downloads/solaris_kernel_vfs.sxw.pdf

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