Operating System:

[Solaris]

Published:

14 January 2010

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2010.0043
 Integer Overflow Security Vulnerability in AES and RC4 Decryption in the
         Solaris Kerberos Crypto Library May Lead to Execution of
                Arbitrary Code or a Denial of Service (DoS)
                              14 January 2010

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

Product:           Solaris Kerberos Crypto Library
Publisher:         Sun Microsystems
Operating System:  Solaris 10
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2009-4212  

Reference:         ESB-2010.0022

Original Bulletin: 
   http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-275530-1

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Article ID : 275530
Article Type : Sun Alert
Last reviewed : 2010-01-12
Audience : PUBLIC
Keywords :

Copyright Notice: Copyright © 2009 Sun Microsystems, Inc. All Rights
Reserved

Integer Overflow Security Vulnerability in AES and RC4 Decryption in
the Solaris Kerberos Crypto Library May Lead to Execution of Arbitrary
Code or a Denial of Service (DoS)
  _________________________________________________________________

Category : Security
Release Phase : Workaround
Bug Id : 6908114
Product : Solaris 10 Operating System
OpenSolaris
Date of Workaround Release : 12-Jan-2010

An integer overflow security vulnerability in the Solaris Kerberos Crypto
Library May Lead to Execution of Arbitrary Code or a Denial of Service (DoS)

1. Impact

An integer overflow security vulnerability in the Solaris Kerberos (see
kerberos(5)) crypto library may allow an unprivileged local or remote user to
cause one of the Kerberos daemons to crash, or, under extraordinarily unlikely
conditions, execute arbitrary code wth elevated privileges by inducing the
decryption of an invalid AES or RC4 ciphertext. If a master or slave Key
Distribution Center (KDC) is compromised then all services relying on that
KDC for authentication may be compromised as well.

This issue is also referenced in:
 MIT krb5 Security Advisory 2009-004
 http://web.mit.edu/Kerberos/advisories/MITKRB5-SA-2009-004.txt

 CVE-2009-4212
 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4212

2. Contributing Factors

This issue can occur in the following releases:
SPARC Platform
  * Solaris 10
  * OpenSolaris based upon builds snv_01 or later

x86 Platform
  * Solaris 10
  * OpenSolaris based upon builds snv_01 or later

Note 1: Solaris 8 and Solaris 9 are not impacted by this issue.
Note 2: This issue only affects systems configured to use Kerberos. To
determine if a system is configured to use Kerberos, the following
command may be run:

       $ test -f /etc/krb5/krb5.conf && grep default_realm /etc/krb5/krb5.conf \
        || echo "System is not configured to use Kerberos."

If there is no krb5.conf(4) Kerberos configuration file or if the output of
the above command is as follows:

 default_realm = ___default_realm___

then the system is not configured to use Kerberos.

Note 3: OpenSolaris distributions may include additional bug fixes bove and
beyond he build from which it was derived. The base build can be derived as
follows:

 $ uname -v
 snv_101

3. Symptoms

There are no predictable symptoms that would indicate the described ssue
has been exploited to execute arbitrary code or heap corruption. If the
described issue has been exploited to cause a Denial of Service (DoS) the
symptoms will depend on which Kerberos component has been impacted.

4. Workaround

Interim Security Relief (ISR) is available from
http://sunsolve.sun.com/tpatches for the following releases:

SPARC Platform
  * Solaris 10 IDR143817-01

x86 Platform
  * Solaris 10 IDR143818-01

Note: This document refers to one or more Interim Security Relief (ISRs)
which are designed to address the concerns identified herein. Sun has
limited experience with these (ISRs) due to their interim nature. As
such, you should only install the ISRs on systems meeting the
configurations described above. Sun may release full patches at a later
date, however, Sun is under no obligation whatsoever to create, release,
or distribute any such patch.

5. Resolution

A final resolution is pending completion.

This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.
Copyright 2000-2010 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved

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