[FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-03:18.openssl

From: FreeBSD Security Advisories (security-advisories_at_freebsd.org)
Date: 10/04/03

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    Date: Fri, 3 Oct 2003 15:49:33 -0700 (PDT)
To: FreeBSD Security Advisories <security-advisories@freebsd.org>

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    =============================================================================
    FreeBSD-SA-03:18.openssl Security Advisory
                                                              The FreeBSD Project

    Topic: OpenSSL vulnerabilities in ASN.1 parsing

    Category: crypto
    Module: openssl
    Announced: 2003-10-03
    Credits: NISCC <URL:http://www.niscc.gov.uk>
                    Dr. Stephen Henson <steve@openssl.org>
    Affects: FreeBSD versions 4.0-RELEASE through 4.8-RELEASE,
                    5.0-RELEASE, and 5.1-RELEASE
                    4-STABLE prior to the correction date
    Corrected: 2003-10-03 01:32:13 UTC (RELENG_4, 4.9-RC)
                    2003-10-03 18:13:19 UTC (RELENG_5_1, 5.1-RELEASE-p10)
                    2003-10-03 20:22:27 UTC (RELENG_5_0, 5.0-RELEASE-p18)
                    2003-10-03 18:14:26 UTC (RELENG_4_8, 4.8-RELEASE-p13)
                    2003-10-03 20:24:31 UTC (RELENG_4_7, 4.7-RELEASE-p23)
                    2003-10-03 20:24:59 UTC (RELENG_4_6, 4.6.2-RELEASE-p26)
    FreeBSD only: NO

    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

    This advisory addresses four separate flaws recently fixed in OpenSSL.
    The flaws are described in the following excerpt from the OpenSSL.org
    advisory (see references):

      1. Certain ASN.1 encodings that are rejected as invalid by the
      parser can trigger a bug in the deallocation of the corresponding
      data structure, corrupting the stack. This can be used as a denial
      of service attack. It is currently unknown whether this can be
      exploited to run malicious code. This issue does not affect OpenSSL
      0.9.6.

      2. Unusual ASN.1 tag values can cause an out of bounds read
      under certain circumstances, resulting in a denial of service
      vulnerability.

      3. A malformed public key in a certificate will crash the verify
      code if it is set to ignore public key decoding errors. Public
      key decode errors are not normally ignored, except for
      debugging purposes, so this is unlikely to affect production
      code. Exploitation of an affected application would result in a
      denial of service vulnerability.

      4. Due to an error in the SSL/TLS protocol handling, a server
      will parse a client certificate when one is not specifically
      requested. This by itself is not strictly speaking a vulnerability
      but it does mean that *all* SSL/TLS servers that use OpenSSL can be
      attacked using vulnerabilities 1, 2 and 3 even if they don't enable
      client authentication.

    III. Impact

    A remote attacker may create a malicious ASN.1 encoded message that
    will cause an OpenSSL-using application to crash, or even perhaps
    execute arbitrary code with the privileges of the application.

    Only applications that use OpenSSL's ASN.1 or X.509 handling code
    are affected. Applications that use other portions of OpenSSL
    are unaffected (e.g. Apache+mod_ssl is affected, while OpenSSH is
    unaffected).

    IV. Workaround

    No workaround is available.

    V. Solution

    Perform one of the following:

    1) Upgrade your vulnerable system to 4-STABLE; or to the RELENG_5_1,
    RELENG_4_8, or RELENG_4_7 security branch dated after the correction
    date.

    2) To patch your present system:

    The following patches have been verified to apply to FreeBSD 4.6, 4.7,
    4.8, 5.0, and 5.1 systems.

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

    [FreeBSD 4.6, 4.7, 5.0 -- be sure you have previously applied the
     patches for advisories FreeBSD-SA-03:02 and FreeBSD-SA-03:06 before
     applying this patch.]

    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:18/openssl96.patch
    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:18/openssl96.patch.asc

    [FreeBSD 4.8, 5.1]
    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:18/openssl97.patch
    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:18/openssl97.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_5_1
      src/UPDATING 1.251.2.12
      src/crypto/openssl/crypto/asn1/asn1_lib.c 1.1.1.8.2.1
      src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.1.4.1
      src/crypto/openssl/crypto/x509/x509_vfy.c 1.1.1.5.2.1
      src/crypto/openssl/ssl/s3_srvr.c 1.1.1.11.2.1
      src/sys/conf/newvers.sh 1.50.2.12
    RELENG_5_0
      src/UPDATING 1.229.2.24
      src/crypto/openssl/crypto/asn1/asn1_lib.c 1.1.1.7.2.1
      src/crypto/openssl/crypto/x509/x509_vfy.c 1.1.1.4.2.2
      src/crypto/openssl/ssl/s3_srvr.c 1.1.1.9.2.3
      src/sys/conf/newvers.sh 1.48.2.19
    RELENG_4_8
      src/UPDATING 1.73.2.80.2.15
      src/crypto/openssl/crypto/asn1/asn1_lib.c 1.1.1.1.2.7.2.1
      src/crypto/openssl/crypto/asn1/tasn_dec.c 1.1.1.1.2.1.2.1
      src/crypto/openssl/crypto/x509/x509_vfy.c 1.1.1.1.2.4.2.1
      src/crypto/openssl/ssl/s3_srvr.c 1.1.1.1.2.7.2.1
      src/sys/conf/newvers.sh 1.44.2.29.2.14
    RELENG_4_7
      src/UPDATING 1.73.2.74.2.26
      src/crypto/openssl/crypto/asn1/asn1_lib.c 1.1.1.1.2.6.2.1
      src/crypto/openssl/crypto/x509/x509_vfy.c 1.1.1.1.2.3.2.2
      src/crypto/openssl/ssl/s3_srvr.c 1.1.1.1.2.5.2.3
      src/sys/conf/newvers.sh 1.44.2.26.2.25
    RELENG_4_6
      src/UPDATING 1.73.2.68.2.55
      src/crypto/openssl/crypto/asn1/asn1_lib.c 1.1.1.1.2.3.6.4
      src/crypto/openssl/crypto/x509/x509_vfy.c 1.1.1.1.2.2.8.3
      src/crypto/openssl/ssl/s3_srvr.c 1.1.1.1.2.3.6.4
      src/sys/conf/newvers.sh 1.44.2.23.2.43
    - -------------------------------------------------------------------------

    VII. References

    <URL: http://www.openssl.org/news/secadv_20030930.txt >
    <URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0545 >
    <URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0543 >
    <URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0544 >
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