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             AUSCERT External Security Bulletin Redistribution

                ESB-2003.0230 -- OpenBSD Security Advisory
                       New sendmail buffer overflow
                               01 April 2003

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                sendmail
Vendor:                 OpenBSD
Operating System:       OpenBSD 3.2
                        OpenBSD 3.1
Impact:                 Root Compromise
                        Denial of Service
Access Required:        Remote
CVE Names:              CAN-2003-0161

Ref:                    AL-2003.05
                        ESB-2003.0227

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A buffer overflow in address parsing due to char to int conversion
has been discovered in sendmail by Michal Zalewski.

For more information on the bug, please see:
    http://www.cert.org/advisories/CA-2003-12.html
    http://www.securityfocus.com/archive/1/316773/2003-03-28/2003-04-03/0

As shipped, OpenBSD runs a sendmail that binds only to localhost,
making this a localhost-only hole in the default configuration.
However, any sendmail configuration that accepts incoming mail may
potentially be exploited.  It is worth noting that the ProPolice
stack protector (http://www.trl.ibm.com/projects/security/ssp/)
that will ship with OpenBSD 3.3 would have protected a system from
an attacker trying to exploit this bug.

The sendmail in OpenBSD-current (and OpenBSD 3.3) has been updated
to version 8.12.9 which includes a fix for this problem.
The 3.1 and 3.2 -stable branches have had a patch applied that fixes
the buffer overflow.  However, because the -stable branches have
the specific vulnerability patched (as opposed to the full 8.12.9
distribution), sendmail on -stable will report the old sendmail version.

Patch for OpenBSD 3.1:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.1/common/027_sendmail.patch

Patch for OpenBSD 3.2:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.2/common/014_sendmail.patch

Patches for older versions of sendmail may be found at
ftp://ftp.sendmail.org/pub/sendmail/

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