[UNIX] SAP Database Local Root Vulnerability During the Installation Process

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Date: 04/27/03

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Date: 27 Apr 2003 21:43:59 +0200

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      SAP Database Local Root Vulnerability During the Installation Process
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.sapdb.org> SAP DB is a Free Enterprise database. An
    exploitable race condition exists during installation that can be won to
    yield root to a local malicious user. An executable is world writeable
    before a setuid bit is set by the installation program.

    DETAILS

    Vulnerable systems:
     * SAP DB version 7.3.0.29
     * SAP DB version 7.4.3.7 beta

    Installation of the SAP database is done by the binary SDBINST. This first
    decompresses the files, changes permissions and then runs a file integrity
    check. Once this check is completed setuid bits are added to two files. A
    large gap between this check and the setuid operation exists (a few
    seconds at i least). This gives us ample time to change the contents of
    the pre-setuid file.

    For the production 7.3.0.29 version:

    Before the setuid root bit is set, a log file is written to that a normal
    non-privileged user can read. This file was located in
    /tmp/sapdb-server-linux-32bit-i386-7_3_0_29/y/config/install/. We simply
    watch that file for what is written to it just before the call to chmod
    and copy our malicious code over the target binary.

    Below is a partial analysis of SDBINST.

    chmod("/usr/sapdb/depend/pgm/lserver", 0100777) = 0

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