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

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To: list@securiteam.com
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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