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Category:   Application (Security)  >   OpenSSL Vendors:   OpenSSL.org
(FreeBSD Issues Fix) OpenSSL Off-by-one Overflow in SL_get_shared_ciphers() Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1018767
SecurityTracker URL:  http://securitytracker.com/id/1018767
CVE Reference:   CVE-2007-5135   (Links to External Site)
Date:  Oct 4 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.9.7m and 0.9.8e and prior versions
Description:   A vulnerability was reported in OpenSSL. A remote user can execute arbitrary code on the target system.

A remote user can send specially crafted data to applications that use the SL_get_shared_ciphers() function trigger an off-by-one overflow and execute arbitrary code on the target system. The code will run with the privileges of the target service.

The vulnerability resides in 'ssl/ssl_lib.c'.

The vendor was notified on June 6, 2007.

Moritz Jodeit reported this vulnerability.
Impact:   A remote user can execute arbitrary code on the target system.
Solution:   FreeBSD has released a fix and has provided the following solution instructions [quoted].

Perform one of the following:

1) Upgrade your vulnerable system to 5-STABLE, or 6-STABLE, or to the
RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the
correction date.

2) To patch your present system:

The following patch have been verified to apply to FreeBSD 5.5, 6.1,
and 6.2 systems.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch http://security.FreeBSD.org/patches/SA-07:08/openssl.patch
# fetch http://security.FreeBSD.org/patches/SA-07:08/openssl.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/secure/lib/libssl
# make obj && make depend && make && make install

The FreeBSD advisory is available at:

http://security.FreeBSD.org/advisories/FreeBSD-SA-07:08.openssl.asc
Vendor URL:  www.openssl.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:   UNIX (FreeBSD)

Message History:   This archive entry is a follow-up to the message listed below.
Oct 1 2007 OpenSSL Off-by-one Overflow in SL_get_shared_ciphers() Lets Remote Users Execute Arbitrary Code


 Source Message Contents
Date:  Wed, 03 Oct 2007 21:58:30 +0000 (GMT)
Subject:  FreeBSD Security Advisory FreeBSD-SA-07:08.openssl


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

=============================================================================
FreeBSD-SA-07:08.openssl                                    Security Advisory
                                                          The FreeBSD Project

Topic:          Buffer overflow in OpenSSL SSL_get_shared_ciphers()

Category:       contrib
Module:         openssl
Announced:      2007-10-03
Credits:        Moritz Jodeit
Affects:        All FreeBSD releases.
Corrected:      2007-10-03 21:39:43 UTC (RELENG_6, 6.2-STABLE)
                2007-10-03 21:40:35 UTC (RELENG_6_2, 6.2-RELEASE-p8)
                2007-10-03 21:41:22 UTC (RELENG_6_1, 6.1-RELEASE-p20)
                2007-10-03 21:42:00 UTC (RELENG_5, 5.5-STABLE)
                2007-10-03 21:42:32 UTC (RELENG_5_5, 5.5-RELEASE-p16)
CVE Name:       CVE-2007-5135

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.

I.   Background

FreeBSD includes software from the OpenSSL Project.  The OpenSSL Project is
a collaborative effort to develop a robust, commercial-grade, full-featured,
and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3)
and Transport Layer Security (TLS v1) protocols as well as a full-strength
general purpose cryptography library.

II.  Problem Description

A buffer overflow addressed in FreeBSD-SA-06:23.openssl has been found
to be incorrectly fixed.

III. Impact

For applications using the SSL_get_shared_ciphers() function, the
buffer overflow could allow an attacker to crash or potentially
execute arbitrary code with the permissions of the user running the
application.

IV.  Workaround

No workaround is available, but only applications using the
SSL_get_shared_ciphers() function are affected.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 5-STABLE, or 6-STABLE, or to the
RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the
correction date.

2) To patch your present system:

The following patch have been verified to apply to FreeBSD 5.5, 6.1,
and 6.2 systems.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch http://security.FreeBSD.org/patches/SA-07:08/openssl.patch
# fetch http://security.FreeBSD.org/patches/SA-07:08/openssl.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/secure/lib/libssl
# make obj && make depend && make && make install

VI.  Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.

Branch                                                           Revision
  Path
- -------------------------------------------------------------------------
RELENG_5
  src/crypto/openssl/ssl/ssl_lib.c                           1.1.1.11.2.3
RELENG_5_5
  src/UPDATING                                            1.342.2.35.2.16
  src/sys/conf/newvers.sh                                  1.62.2.21.2.18
  src/crypto/openssl/ssl/ssl_lib.c                       1.1.1.11.2.1.4.2
RELENG_6
  src/crypto/openssl/ssl/ssl_lib.c                           1.1.1.12.2.2
RELENG_6_2
  src/UPDATING                                            1.416.2.29.2.11
  src/sys/conf/newvers.sh                                  1.69.2.13.2.11
  src/crypto/openssl/ssl/ssl_lib.c                       1.1.1.12.2.1.2.1
RELENG_6_1
  src/UPDATING                                            1.416.2.22.2.22
  src/sys/conf/newvers.sh                                  1.69.2.11.2.22
  src/crypto/openssl/ssl/ssl_lib.c                           1.1.1.12.6.2
- -------------------------------------------------------------------------

VII. References

http://marc.info/?l=bugtraq&m=119091888624735
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3738
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5135

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-07:08.openssl.asc
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