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             AUSCERT External Security Bulletin Redistribution

                ESB-2002.367 -- AIX Security Alert Summary
                           Vulnerability in PHP
                               29 July 2002

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

Product:                PHP
Vendor:                 IBM
Operating System:       AIX with the AIX Toolbox for Linux Applications
Impact:                 Denial of Service
                        Execute Arbitrary Code/Commands
Access Required:        Remote

Ref:                    AL-2002.08
                        ESB-2002.356
                        ESB-2002.347

Comments:  This advisory contains the response from IBM on the recent PHP 
           Vulnerability.  It updates ESB-2002.347.

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This file contains summary information on AIX security alerts published
by the Computer Emergency Response Team (CERT), and the IBM Emergency
Response Team (ERS).  The full text of these alerts can be obtained from
this mail server by requesting the 'CERT' and 'ERS' files.  This
information (and more) is available from CERT and ERS directly on the
world-wide web at the following URLs:

  CERT: http://www.cert.org/

   ERS: http://www.ers.ibm.com/

In order to keep the size of this file reasonable, it contains only
advisories for the current year..  You can obtain a list of previous
advisories either from the above URLs, or by requesting one of the
"Security_YYYY" documents from this mail server.

The fixes mentioned in this document, when available, can be obtained
from Electronic Fix Distribution at the following URL:

  http://techsupport.services.ibm.com/server/fixes

The 'Security_APARs' document on this mail server contains a list of
security related APARs.
===============================================================================
===============================================================================
CERT Advisory CA-2002-21 Vulnerability in PHP

A  vulnerability  has been discovered in PHP. This vulnerability could
be  used  by  a remote attacker to execute arbitrary code or crash PHP
and/or the web server.

IBM  is  not vulnerable to the above vulnerabilities in PHP. We
do  supply the PHP packages for AIX through the AIX Toolbox for
Linux  Applications.  However,  these packages are at 4.0.6 and
also incorporate the security patch from 2/27/2002.
===============================================================================
===============================================================================
CERT Advisory CA-2002-20 Multiple Vulnerabilities in CDE ToolTalk

Two  vulnerabilities  have  been  discovered  in  the  Common  Desktop
Environment   (CDE)   ToolTalk   RPC   database   server.   The  first
vulnerability  could  be used by a remote attacker to delete arbitrary
files,  cause  a denial of service, or possibly execute arbitrary code
or  commands. The second vulnerability could allow a local attacker to
overwrite arbitrary files with contents of the attacker's choice.

The  CDE desktop product shipped with AIX is vulnerable to both
the  issues  detailed  above  in the advisory. This affects AIX
releases  4.3.3  and  5.1.0  An  efix package will be available
shortly  from  the IBM software ftp site. The efix packages can
be  downloaded  from  ftp.software.ibm.com/aix/efixes/security.
This  directory  contains  a  README  file  that  gives further
details on the efix packages.

The following APARs will be available in the near future:

  AIX 4.3.3: IY32368

  AIX 5.1.0: IY32370
===============================================================================
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CERT Advisory CA-2002-19 Buffer Overflow in Multiple DNS Resolver Libraries

Applications  using  vulnerable  implementations  of  the  Domain Name
System  (DNS)  resolver  libraries, which include, but are not limited
to:

  * Internet  Software  Consortium (ISC) Berkeley Internet Name Domain
    (BIND) DNS resolver library (libbind)

  * Berkeley Software Distribution (BSD) DNS resolver library (libc)

The DNS resolver code supplied in AIX 4.3 and 5.1 are vulnerable.
Fixes will be delivered in the following APARs.

  AIX 4.3:	IY32719
  AIX 5.1: 	IY32746
===============================================================================
===============================================================================
CERT Advisory CA-2002-18 OpenSSH Vulnerabilities in Challenge Response
Handling

There  are  two  related  vulnerabilities  in  the  challenge response
handling  code in OpenSSH versions 2.3.1p1 through 3.3. They may allow
a  remote  intruder to execute arbitrary code as the user running sshd
(often  root).  The first vulnerability affects OpenSSH versions 2.9.9
through  3.3  that have the challenge response option enabled and that
use  SKEY or BSD_AUTH authentication. The second vulnerability affects
PAM  modules  using  interactive  keyboard  authentication  in OpenSSH
versions  2.3.1p1  through  3.3,  regardless of the challenge response
option  setting.  Additionally,  a  number  of other possible security
problems have been corrected in OpenSSH version 3.4.

IBM's  AIX  operating  system  does  not  ship  with OpenSSH; however,
OpenSSH  is  available  for installation on AIX via the Linux Affinity
Toolkit.  The  version  included  on  the CD containing the Toolkit is
vulnerable to the latest discovered vulnerability discussed here as is
the  version  of  OpenSSH available for downloading from the IBM Linux
Affinity website. Anyone running this version is advised to follow the
recommendations above to limit their vulnerability.

We  working  with  the  changes  for  version  3.4 and will have a new
package  availble for download as soon as possible. When available the
new packages can be downloaded from:

     http://www6.software.ibm.com/dl/aixtbx/aixtbx-p

This    site   contains   Linux   Affinity   applications   containing
cryptographic  algorithms,  and  new  users  of this site are asked to
register first.
===============================================================================
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CERT Advisory CA-2002-17 Apache Web Server Chunk Handling Vulnerability

There is a remotely exploitable vulnerability in the handling of large
chunks  of  data  in web servers that are based on Apache source code.
This  vulnerability  is present by default in configurations of Apache
web  servers  versions  1.3  through  1.3.24  and versions 2.0 through
2.0.36.  The  impact  of  this  vulnerability  is  dependent  upon the
software version and the hardware platform the server is running on.

IBM  makes  the Apache Server availble for AIX customers as a software
package  under  the  AIX-Linux  Affinity  initiative.  This package is
included  on  the  AIX  Toolbox  for Linux Applications CD, and can be
downloaded via the IBM Linux Affinity website. The currently available
version of Apache Server is susceptible to the vulnerability described
here.  We  will  update  our Apache Server offering shortly to version
1.3.23,  including  the patch for this vulnerability; this update will
be made available for downloading by accessing this URL:

  http://www-1.ibm.com/servers/aix/products/aixos/linux/download.html

and following the instructions presented there.

Please  note  that  Apache Server, and all Linux Affinity software, is
offered on an "as-is" basis. IBM does not own the source code for this
software,  nor  has  it developed and fully tested this code. IBM does
not support these software packages.
===============================================================================
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CERT Advisory CA-2002-15 Denial-of-Service Vulnerability in ISC BIND 9

AIX is not vulnerable.
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CERT Advisory CA-2002-12 Format String Vulnerability in ISC DHCPD

AIX is not vulnerable.
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CERT Advisory CA-2002-11 Heap Overflow in Cachefs Daemon (cachefsd)

AIX is not vulnerable.
===============================================================================
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CERT Advisory CA-2002-10 Format String Vulnerability in rpc.rwalld

AIX 4.3 and 5.1 are not vulnerable.
===============================================================================
===============================================================================
CERT Advisory CA-2002-07 Double Free Bug in zlib Compression Library
(Updated 3/29/2002)

IBM's   AIX   operating   system,   version   5.1,   ships  with  open
source-originated  zlib  that  is used with the Redhat Package Manager
(rpm)  to  install  applications  that  are  included in the AIX-Linux
Affinity Toolkit. zlib (libz.a) is a shared library in AIX. AIX 5.1 is
susceptible  to  the  described vulnerability. AIX 4.3.x does not ship
with zlib, but customers who install zlib and use it will be similarly
vulnerable.

An updated rpm.rte install image for AIX 5.1 can be obtained from:

 ftp://ftp.software.ibm.com/aix/freeSoftware/aixtoolbox/INSTALLP/ppc/

Customers that have installed zlib from the AIX-Linux Affinity Toolkit
CD can obtain an updated zlib RPM from:

 ftp://ftp.software.ibm.com/aix/freeSoftware/aixtoolbox/RPMS/ppc/zlib/
===============================================================================
===============================================================================
CERT Advisory CA-2002-06 Vulnerabilities in Various Implementations of the
                         RADIUS Protocol

AIX is not vulnerable.
===============================================================================
===============================================================================
CERT Advisory CA-2002-03: Multiple Vulnerabilities in Many
Implementations of the Simple Network Management Protocol (SNMP)

The AIX operating system is susceptible to the vulnerabilities
tested for by the Oulu University PROTOS test suite for all
levels of AIX 4.3.x prior to level 4.3.3.51, and AIX 5.1 prior
to level 5.1.0.10. APARs were developed and made available last
year that closed the vulnerabilities looked for by the test suite.
For 4.3.x, the relevant APAR is #IY17630; for 5.1, the appropriate
APAR is #IY20943.

To see if your version and level of AIX is vulnerable, enter the
command:

  lslpp -l bos.net.tcp.client

If the "Level" stated is lower than those given above, your
system is vulnerable, and you are urged to apply the appropriate
APAR.

AIX versions prior to 4.3 are also vulnerable, but these versions
are no longer supported by IBM.
===============================================================================
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