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Category:   Application (Security)  >   OpenSSL Vendors:   OpenSSL.org
(EnGarde Issues Fix) OpenSSL Has Multiple Buffer Overflows That Allow Remote Users to Execute Arbitrary Code with Root Privileges
SecurityTracker Alert ID:  1004884
SecurityTracker URL:  http://securitytracker.com/id/1004884
CVE Reference:   CVE-2002-0655, CVE-2002-0656, CVE-2002-0657, CVE-2002-0659   (Links to External Site)
Date:  Jul 30 2002
Impact:   Denial of service via network, Execution of arbitrary code via network, Root access via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.9.6d or earlier, 0.9.7-beta2 or earlier, 0.9.7 current development snapshots
Description:   Four buffer overflow conditions were reported in OpenSSL. All four may allow a remote user to execute arbitrary code.

The vendor has reported that A.L. Digital Ltd and The Bunker have uncovered multiple buffer overflows in OpenSSL, discovered during a security review.

A remote user could create a specially crafted, oversized client master key and use SSL2 to trigger an overflow on an SSL server. According to the report, this vulnerability was independently discovered by Neohapsis, which has confirmed that the overflow can be exploited to execute arbitrary code.

A remote user with an SSL server could create a specially crafted, oversized session ID and supply this ID to a target client using SSL3 to trigger an overflow.

A remote user could supply a specially crafted, oversized master key to an SSL3 server to trigger an overflow. It is reported that this flaw affects OpenSSL 0.9.7 prior to version 0.9.7-beta3 when Kerberos is enabled.

Several buffers used for ASCII representations of integers are reportedly too small on 64 bit platforms.

The report also states that other potential buffer overflows that are currently considered to be non-exploitable have been discovered.

The vendor notes that Adi Stav and James Yonan independently reported that the ASN1 parser can be confused by certain invalid encodings, potentially allowing a remote user to cause denial of service conditions. An OpenSSL-based application that use the ASN1 library to parse untrusted data (including all SSL or TLS applications using S/MIME [PKCS#7] or certificate generation routines) are affected.

Impact:   A remote user acting as an SSL client could execute arbitrary code on an SSL server. A remote user acting as an SSL server could cause arbitrary code to be executed on an SSL client that is connecting to the server. In each case, the code would run with privileges of the affected implementation.

A remote user may be able cause denial of service conditions.

Solution:   EnGarde has released a fix. Users of the EnGarde Professional edition can use the Guardian Digital Secure Network to update their systems automatically.

EnGarde Community users should upgrade to the most recent version as outlined below. Updates may be obtained from:

ftp://ftp.engardelinux.org/pub/engarde/stable/updates/
http://ftp.engardelinux.org/pub/engarde/stable/updates/

Before upgrading the package, the machine must either:

a) be booted into a "standard" kernel; or
b) have LIDS disabled.

To disable LIDS, execute the command:

# /sbin/lidsadm -S -- -LIDS_GLOBAL

To install the updated package, execute the command:

# rpm -Uvh files

You must now update the LIDS configuration by executing the command:

# /usr/sbin/config_lids.pl

To re-enable LIDS (if it was disabled), execute the command:

# /sbin/lidsadm -S -- +LIDS_GLOBAL

To verify the signatures of the updated packages, execute the command:

# rpm -Kv files


These updated packages are for EnGarde Secure Linux Community Edition.

Source Packages:

SRPMS/openssl-0.9.6-1.0.16.src.rpm
MD5 Sum: 158ff68fb5474993694d1dd3f623b921

Binary Packages:

i386/openssl-0.9.6-1.0.16.i386.rpm
MD5 Sum: 9f7bd4009f352a3a3a3519c97ebe988d

i386/openssl-misc-0.9.6-1.0.16.i386.rpm
MD5 Sum: 281794e60d923df695f6bcf8aa17055b

i386/openssl-devel-0.9.6-1.0.16.i386.rpm
MD5 Sum: 18b3ecd6b9d210180457caeb50a1331e

i686/openssl-0.9.6-1.0.16.i686.rpm
MD5 Sum: 872eadde6cb52bcf93fae967c72949b1

i686/openssl-misc-0.9.6-1.0.16.i686.rpm
MD5 Sum: 3baf870cbc35f3425cbd3110714ca3ed

i686/openssl-devel-0.9.6-1.0.16.i686.rpm
MD5 Sum: 718f5a6c89fac22f338177134fd5e6bd

Vendor URL:  www.openssl.org/news/secadv_20020730.txt (Links to External Site)
Cause:   Boundary error, Exception handling error
Underlying OS:  Linux (EnGarde)

Message History:   This archive entry is a follow-up to the message listed below.
Jul 30 2002 OpenSSL Has Multiple Buffer Overflows That Allow Remote Users to Execute Arbitrary Code with Root Privileges



 Source Message Contents

Subject:  [ESA-20020730-019] several vulnerabilities in the openssl library




-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1


+------------------------------------------------------------------------+
| EnGarde Secure Linux Security Advisory                   July 30, 2002 |
| http://www.engardelinux.org/                          ESA-20020730-019 |
|                                                                        |
| Packages: openssl, openssl-misc                                        |
| Summary:  several vulnerabilities in the openssl library.              |
+------------------------------------------------------------------------+

  EnGarde Secure Linux is a secure distribution of Linux that features
  improved access control, host and network intrusion detection, Web
  based secure remote management, complete e-commerce using AllCommerce,
  and integrated open source security tools.

OVERVIEW
- --------
  There are several potentially exploitable vulnerabilities in the OpenSSL
  toolkit.  A security review of OpenSSL is being done by A.L. Digital Ltd
  and The Bunker (http://www.thebunker.net/) under the DARPA program
  CHATS.  Through this review, the following vulnerabilities were
  discovered:

    1. The client master key in SSL2 could be oversized and overrun a
       buffer. This vulnerability was also independently discovered by
       consultants at Neohapsis (http://www.neohapsis.com/) who have
       also demonstrated that the vulnerability is exploitable.

    2. The session ID supplied to a client in SSL3 could be oversized and
       overrun a buffer.

    3. Various buffers for ASCII representations of integers were too
       small on 64 bit platforms.

    4. The ASN1 parser can be confused by supplying it with certain
       invalid encodings.

  The Common Vulnerabilities and Exposures project (cve.mitre.org) has
  assigned the name CAN-2002-0656 to issues 1-2, CAN-2002-0655 to issue 3,
  and CAN-2002-0659 to issue 4.

SOLUTION
- --------
  Users of the EnGarde Professional edition can use the Guardian Digital
  Secure Network to update their systems automatically.

  EnGarde Community users should upgrade to the most recent version
  as outlined in this advisory.  Updates may be obtained from:

    ftp://ftp.engardelinux.org/pub/engarde/stable/updates/
    http://ftp.engardelinux.org/pub/engarde/stable/updates/

  Before upgrading the package, the machine must either:

    a) be booted into a "standard" kernel; or
    b) have LIDS disabled.

  To disable LIDS, execute the command:

    # /sbin/lidsadm -S -- -LIDS_GLOBAL

  To install the updated package, execute the command:

    # rpm -Uvh files

  You must now update the LIDS configuration by executing the command:

    # /usr/sbin/config_lids.pl

  To re-enable LIDS (if it was disabled), execute the command:

    # /sbin/lidsadm -S -- +LIDS_GLOBAL

  To verify the signatures of the updated packages, execute the command:

    # rpm -Kv files

UPDATED PACKAGES
- ----------------
  These updated packages are for EnGarde Secure Linux Community
  Edition.

  Source Packages:

    SRPMS/openssl-0.9.6-1.0.16.src.rpm
      MD5 Sum: 158ff68fb5474993694d1dd3f623b921

  Binary Packages:

    i386/openssl-0.9.6-1.0.16.i386.rpm
      MD5 Sum: 9f7bd4009f352a3a3a3519c97ebe988d

    i386/openssl-misc-0.9.6-1.0.16.i386.rpm
      MD5 Sum: 281794e60d923df695f6bcf8aa17055b

    i386/openssl-devel-0.9.6-1.0.16.i386.rpm
      MD5 Sum: 18b3ecd6b9d210180457caeb50a1331e

    i686/openssl-0.9.6-1.0.16.i686.rpm
      MD5 Sum: 872eadde6cb52bcf93fae967c72949b1

    i686/openssl-misc-0.9.6-1.0.16.i686.rpm
      MD5 Sum: 3baf870cbc35f3425cbd3110714ca3ed

    i686/openssl-devel-0.9.6-1.0.16.i686.rpm
      MD5 Sum: 718f5a6c89fac22f338177134fd5e6bd

REFERENCES
- ----------
  Guardian Digital's public key:
    http://ftp.engardelinux.org/pub/engarde/ENGARDE-GPG-KEY

  OpenSSL's Official Web Site:
    http://www.openssl.org/

  Security Contact:   security@guardiandigital.com
  EnGarde Advisories: http://www.engardelinux.org/advisories.html

- --------------------------------------------------------------------------
$Id: ESA-20020730-019-openssl,v 1.2 2002/07/30 12:05:04 rwm Exp $
- --------------------------------------------------------------------------
Author: Ryan W. Maple <ryan@guardiandigital.com> 
Copyright 2002, Guardian Digital, Inc.

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------------------------------------------------------------------------
     To unsubscribe email engarde-security-request@engardelinux.org
         with "unsubscribe" in the subject of the message.

Copyright(c) 2001 Guardian Digital, Inc.                EnGardeLinux.org
------------------------------------------------------------------------


 
 


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