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Subject: Caldera Security Advisory SA-1997.14: Vulnerability in "db" library

Caldera Security Advisory SA-1997.14
Original report date:  08-Jul-1997
RPM build date:        09-Jul-1997
Original issue date:   03-Sep-1997

Topic: Vulnerability in the "db" library

I. Problem Description

  Package db-1.85.4 contains the Berkeley Database Package (DB)
  which is a programmatic toolkit to provide database support for
  applications. This package uses incomplete implementations of
  the snprintf() and vsnprintf() functions in such a manner to
  make applications that use the "db" library vulnerable to stack
  overrun exploits.

II. Impact

  Required libraries are to be updated to alleviate potential
  security problems. Various applications using the (DB) package
  are susceptible to stack overrun exploits.

  The following Caldera releases are affected:

    Base     1.0
    Base     1.1
    Lite     1.1
    Standard 1.1
  
  Those who use one of the above releases may verify if they are
  affected by running the following:

    rpm -q db

  If version "db-1.85.4-2" (or older) is installed, a fix is required.

III. Solution

  There are both a temporary and permanent fix.  The temporary fix
  applies to those that are not connected to the Internet or WILL
  NEVER connect to the Internet.

    cd /user/lib
    test -w libdb.a && ar ds libdb.a snprintf.o vsnprintf.o
    SO=libdb.so.1.85.4
    objcopy -v -N snprintf -N vsnprintf $SO $SO-new
    chmod 755 $SO-new && /sbin/ldconfig

  The permanent fix will update your current db package. 
  One would update by running the following:   
           
    rpm -U RPMS/db-1.85.4-3.i386.rpm
    rpm -q db-devel && rpm -U RPMS/db-devel-1.85.4-3.i386.rpm

  These updates are on Caldera's FTP server (ftp://ftp.caldera.com):

  /pub/openlinux/updates/1.1/current/RPMS/ for the binaries.
  /pub/openlinux/updates/1.1/current/SRPMS/ for the sources.
  
  The MD5 checksums (from the "md5sum" command) for these packages are:

  72297de7ee245405eac15596afb0dc28  RPMS/db-1.85.4-3.i386.rpm
  dc35c982d3c017f46a9ac6efe93513e0  RPMS/db-devel-1.85.4-3.i386.rpm
  694c42ca0984a58dbfd2ce44478770b1  SRPMS/db-1.85.4-3.src.rpm

IV. References

  Security problem around snprintf() as announced to the
  "linux-security" email list by Thomas Roessler <roessler@guug.de>
  on Tue, 8 Jul 1997 21:33:55 +0200.  Message ID:
  <19970708213355.43189@sobolev.rhein.de>.

  This and other Caldera security resources are located at:

    http://www.caldera.com/tech-ref/security/

  This advisory closes Caldera's internal bug report #856

V. PGP Signature

  This message was signed with the PGP key for <security@caldera.com>.

  This key can be obtained from:
    ftp://ftp.caldera.com/pub/pgp-keys/

  Or on an OpenLinux CDROM under:
    /OpenLinux/pgp-keys/

  $Id: SA-1997.14,v 1.2 1997/09/03 18:38:53 ron Exp $

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