FreeBSD Security Advisory FreeBSD-SA-04:05.openssl

From: FreeBSD Security Advisories (security-advisories_at_freebsd.org)
Date: 03/17/04

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    Date: Wed, 17 Mar 2004 08:48:32 -0800 (PST)
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    FreeBSD-SA-04:05.openssl Security Advisory
                                                              The FreeBSD Project

    Topic: Denial-of-service vulnerability in OpenSSL

    Category: crypto
    Module: openssl
    Announced: 2004-03-17
    Credits: OpenSSL Project <URL:http://www.openssl.org>
                    Codenomicon Ltd <URL:http://www.codenomicon.com>
    Affects: All FreeBSD 4.x and 5.x releases
    Corrected: 2004-03-17 12:23:51 UTC (RELENG_4, 4.9-STABLE)
                    2004-03-17 12:14:12 UTC (RELENG_5_2, 5.2.1-RELEASE-p3)
                    2004-03-17 12:14:56 UTC (RELENG_5_1, 5.1-RELEASE-p16)
                    2004-03-17 12:17:13 UTC (RELENG_4_9, 4.9-RELEASE-p4)
                    2004-03-17 12:18:23 UTC (RELENG_4_8, 4.8-RELEASE-p17)
    CVE Name: CAN-2004-0079
    FreeBSD only: NO

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

    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

    When processing an SSL/TLS ChangeCipherSpec message, OpenSSL may fail to
    check that a new cipher has been previously negotiated. This may result
    in a null pointer dereference.

    III. Impact

    A remote attacker could perform a specially crafted SSL/TLS handshake
    with an application that utilizes OpenSSL, triggering the null pointer
    dereference and causing the application to crash. Depending upon the
    specifics of the application, this may result in an effective
    denial-of-service.

    IV. Workaround

    No workaround is known.

    V. Solution

    Perform one of the following:

    1) Upgrade your vulnerable system to 4-STABLE; or to the RELENG_5_2,
    RELENG_4_9, or RELENG_4_8 security branch dated after the correction
    date.

    2) To patch your present system:

    The following patches have been verified to apply to FreeBSD 4.8,
    4.9, 5.1, and 5.2 systems.

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

    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:05/openssl.patch
    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:05/openssl.patch.asc

    b) Execute the following commands as root:

    # cd /usr/src
    # patch < /path/to/patch

    c) Recompile the operating system as described in
    <URL: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html >.

    Note that any statically linked applications that are not part of the
    base system (i.e. from the Ports Collection or other 3rd-party sources)
    must be recompiled.

    All affected applications must be restarted for them to use the
    corrected library. Though not required, rebooting may be the easiest
    way to accomplish this.

    VI. Correction details

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

    Branch Revision
      Path
    - -------------------------------------------------------------------------
    RELENG_4
      src/crypto/openssl/crypto/opensslv.h 1.1.1.1.2.9
      src/crypto/openssl/ssl/s3_pkt.c 1.1.1.1.2.7
    RELENG_5_2
      src/UPDATING 1.282.2.11
      src/crypto/openssl/crypto/opensslv.h 1.1.1.14.2.1
      src/crypto/openssl/ssl/s3_pkt.c 1.1.1.8.4.1
      src/sys/conf/newvers.sh 1.56.2.10
    RELENG_5_1
      src/UPDATING 1.251.2.18
      src/crypto/openssl/crypto/opensslv.h 1.1.1.13.2.1
      src/crypto/openssl/ssl/s3_pkt.c 1.1.1.8.2.1
      src/sys/conf/newvers.sh 1.50.2.18
    RELENG_4_9
      src/UPDATING 1.73.2.89.2.5
      src/crypto/openssl/crypto/opensslv.h 1.1.1.1.2.8.2.1
      src/crypto/openssl/ssl/s3_pkt.c 1.1.1.1.2.6.4.1
      src/sys/conf/newvers.sh 1.44.2.32.2.5
    RELENG_4_8
      src/UPDATING 1.73.2.80.2.20
      src/crypto/openssl/crypto/opensslv.h 1.1.1.1.2.7.2.1
      src/crypto/openssl/ssl/s3_pkt.c 1.1.1.1.2.6.2.1
      src/sys/conf/newvers.sh 1.44.2.29.2.18
    - -------------------------------------------------------------------------

    VII. References

    <URL: http://www.openssl.org/news/secadv_20040317.txt >
    <URL: http://cvs.openssl.org/chngview?cn=12033 >
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