SCO 5.0.6 MMDF issues (sendmail 8.9.3)

["Secure Network Operations , Inc." <recon () SNOSOFT COM>]

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Strategic Reconnaissance Team Security Advisory(SRT2001-01)
Topic: SCO 5.0.6 MMDF issues (sendmail 8.9.3)
Vendor: SCO
Release Date: 03/27/01
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.: Description
SCO OpenServer 5.0.6 ships with a previously known buggy MMDF package.
SCO Security Bulletin 2000.06 states "Recently Network Associates, Inc.
issued a  SECURITY ADVISORY against all versions of MMDF prior to the
beta release 2.44a-B4" however SCO still released OpenServer 5.0.6 with
version 2.43.3b of MMDF. The sendmail 8.9.3 binary has poor handling of
command line arguments resulting in a buffer overflow.

.: Impact
/opt/K/SCO/MMDF/2.43.3b/usr/lib/sendmail `perl -e 'print "A" x 3000'`
Memory fault - core dumped

This problem makes it possible to overwrite memory space of the running 
process,
and potentially execute code with the inherited privileges of the mmdf 
subsystem.
uid=17(mmdf) gid=22(mmdf) groups=22(mmdf)

.: Workaround
chmod -s /opt/K/SCO/MMDF/2.43.3b/usr/lib/sendmail
upgrade to a newer version of MMDF.

.: Systems Affected
SCO OpenServer 5.0.6 upgrade from 5.0.x and 5.0.6 fresh install.

.: Proof of Concept
To be released at a later time. Existing 5.0.x sendmail exploits may be valid.

.: Vendor Status
Vendor was notified on 03/22/01. Vendor lab tests confirmed the issue. Patch
status is unknown.

.: References
Original SCO advisory
ftp://ftp.sco.com/SSE/security_bulletins/SB-00.06a

.: Credit
Kevin Finisterre
dotslash () snosoft com, krfinisterre () checkfree com

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©Copyright 2001 Secure Network Operations , Inc.  All Rights Reserved.
Strategic Reconnaissance Team | recon () snosoft com
http://recon.snosoft.com     | http://www.snosoft.com
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