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Category:   Application (Security)  >   OpenSSL Vendors:   OpenSSL.org
(Trustix Issues Fix) OpenSSL Has Multiple Buffer Overflows That Allow Remote Users to Execute Arbitrary Code with Root Privileges
SecurityTracker Alert ID:  1004886
SecurityTracker URL:  http://securitytracker.com/id/1004886
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:   Trustix has released a fix, available at:

<URI:http://www.trustix.net/pub/Trustix/updates/>
<URI:ftp://ftp.trustix.net/pub/Trustix/updates/>

Users of the SWUP tool can enjoy having updates automatically installed using 'swup --upgrade'.

MD5sums of the packages:

0c51861ce4432c3f669657e2c4971c6f ./1.5/SRPMS/openssl-0.9.6-10tr.src.rpm
eb8a64dba138584b8085aec8d9ccaf0c ./1.5/RPMS/openssl-support-0.9.6-10tr.i586.rpm
9db293f035fbd82a3482ab87d3465eb2 ./1.5/RPMS/openssl-python-0.9.6-10tr.i586.rpm
582d08bb63676a33da1aa89a33a05914 ./1.5/RPMS/openssl-devel-0.9.6-10tr.i586.rpm
2d05569684b868cbacca9e389ded3f0f ./1.5/RPMS/openssl-0.9.6-10tr.i586.rpm
96053f774317702af40705697a2460d4 ./1.2/SRPMS/openssl-0.9.6-3tr.src.rpm
84b50e02167b61a9d3093bcc055c7b45 ./1.2/RPMS/openssl-devel-0.9.6-3tr.i586.rpm
b0c3b99917e1c69f593a74b9989a33f9 ./1.2/RPMS/openssl-0.9.6-3tr.i586.rpm
96053f774317702af40705697a2460d4 ./1.1/SRPMS/openssl-0.9.6-3tr.src.rpm
111d6f3e42c2410a11ac4704036a31ef ./1.1/RPMS/openssl-devel-0.9.6-3tr.i586.rpm
23d4bef487e86dfff1854f3f3c6fd867 ./1.1/RPMS/openssl-0.9.6-3tr.i586.rpm

Vendor URL:  www.openssl.org/news/secadv_20020730.txt (Links to External Site)
Cause:   Boundary error, Exception handling error
Underlying OS:  Linux (Trustix)
Underlying OS Comments:  1.1, 1.2, 1.5

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:  TSLSA-2002-0063 - openssl


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

- --------------------------------------------------------------------------
Trustix Secure Linux Security Advisory #2002-0063

Package name:      openssl
Summary:           Multiple security problems
Date:              2002-07-29
Affected versions: TSL 1.1, 1.2, 1.5

- --------------------------------------------------------------------------

Problem description:
  Several severe security problems have been found in the openssl source
  code which upon the TSL openssl packages are based. Most of these 
  vulnerabilities have a potential for remote expoitation, even though no 
  exploits are currently released.
  The upstream development group have provided us with patches that fixes 
  the problems. 
  
  These issues have been asigned the following CVE names:
  CAN-2002-0655, CAN-2002-0656, and CAN-2002-0659.
  
  More information:
  <URI: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0655>
  <URI: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0656>
  <URI: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0659>

Action:
  We recommend that all systems with this package installed are upgraded.
  Please note that if you do not need the functionality provided by this
  package, you may want to remove it from your system.


Location:
  All TSL updates are available from
  <URI:http://www.trustix.net/pub/Trustix/updates/>
  <URI:ftp://ftp.trustix.net/pub/Trustix/updates/>


Automatic updates:
  Users of the SWUP tool can enjoy having updates automatically
  installed using 'swup --upgrade'.

  Get SWUP from:
  <URI:ftp://ftp.trustix.net/pub/Trustix/software/swup/>


Public testing:
  These packages have been available for public testing for some time.
  If you want to contribute by testing the various packages in the
  testing tree, please feel free to share your findings on the
  tsl-discuss mailinglist.
  The testing tree is located at
  <URI:http://www.trustix.net/pub/Trustix/testing/>
  <URI:ftp://ftp.trustix.net/pub/Trustix/testing/>
  

Questions?
  Check out our mailing lists:
  <URI:http://www.trustix.net/support/>


Verification:
  This advisory along with all TSL packages are signed with the TSL sign key.
  This key is available from:
  <URI:http://www.trustix.net/TSL-GPG-KEY>

  The advisory itself is available from the errata pages at
  <URI:http://www.trustix.net/errata/trustix-1.2/> and
  <URI:http://www.trustix.net/errata/trustix-1.5/>
  or directly at
  <URI:http://www.trustix.net/errata/misc/2002/TSL-2002-0063-openssl.asc.txt>


MD5sums of the packages:
- --------------------------------------------------------------------------
0c51861ce4432c3f669657e2c4971c6f  ./1.5/SRPMS/openssl-0.9.6-10tr.src.rpm
eb8a64dba138584b8085aec8d9ccaf0c  ./1.5/RPMS/openssl-support-0.9.6-10tr.i586.rpm
9db293f035fbd82a3482ab87d3465eb2  ./1.5/RPMS/openssl-python-0.9.6-10tr.i586.rpm
582d08bb63676a33da1aa89a33a05914  ./1.5/RPMS/openssl-devel-0.9.6-10tr.i586.rpm
2d05569684b868cbacca9e389ded3f0f  ./1.5/RPMS/openssl-0.9.6-10tr.i586.rpm
96053f774317702af40705697a2460d4  ./1.2/SRPMS/openssl-0.9.6-3tr.src.rpm
84b50e02167b61a9d3093bcc055c7b45  ./1.2/RPMS/openssl-devel-0.9.6-3tr.i586.rpm
b0c3b99917e1c69f593a74b9989a33f9  ./1.2/RPMS/openssl-0.9.6-3tr.i586.rpm
96053f774317702af40705697a2460d4  ./1.1/SRPMS/openssl-0.9.6-3tr.src.rpm
111d6f3e42c2410a11ac4704036a31ef  ./1.1/RPMS/openssl-devel-0.9.6-3tr.i586.rpm
23d4bef487e86dfff1854f3f3c6fd867  ./1.1/RPMS/openssl-0.9.6-3tr.i586.rpm
- --------------------------------------------------------------------------


Trustix Security Team

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQE9RSsqwRTcg4BxxS0RAgv0AJsGLRMNaZ2pmZdE4NRQCLgfRpNLygCdHfkE
3bFFVLoH4NXOBs+mT/i8T4E=
=Ydxh
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