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______________________________________________________________________________ 

                        SuSE Security Announcement 

        Package: openssl/Slapper worm 
        Announcement-ID: SuSE-SA:2002:033 
        Date: Thu Sep 19 2002 
        Affected products: 7.0, 7.1, 7.2, 7.3, 8.0 
                                SuSE Linux Database Server, 
                                SuSE eMail Server III, 
                                SuSE eMail Server 3.1, 
                                SuSE Linux Enterprise Server, 
                                SuSE Linux Firewall on CD, 
                                SuSE Linux Enterprise Server 7 
                                SuSE Linux Office Server 
        Vulnerability Type: buffer overflow 
        Severity (1-10): 9 
        SuSE default package: yes 
        Cross References: CVE CAN-2002-0655, CAN-2002-0656, 
                                CAN-2002-0659, SuSE-SA:2002:027 

    Content of this advisory: 
        1) vulnerabilities in openssl libraries; Slapper worm 
        2) pending vulnerabilities, solutions, workarounds 
        3) standard appendix (further information) 

______________________________________________________________________________ 

1) problem description, brief discussion, solution, upgrade information 

    This advisory is issued in an attempt to clarify any issues 
    surrounding the recently discovered Apache/mod_ssl worm. 

    On July 30, we released a security advisory concerning vulnerabilities 
    in OpenSSL, including a buffer overflow in the SSL code. This 
    vulnerability (CVE CAN-2002-0656, also discussed in CERT Advisory 
    http://www.cert.org/advisories/CA-2002-23.html) is currently being 
    exploited by a worm called Slapper, propagating through Apache's 
    mod_ssl module. 
     
    It is worth noting that even though the worm infects Apache through 
    mod_ssl, this is not a vulnerability in mod_ssl or Apache, but in 
    the OpenSSL library used by mod_ssl. 

    This also means that Apache may not be the only service vulnerable 
    to an attack via the SSL bug. Similar exploits may be possible 
    against cyrus-imapd, sendmail with TLS support, or sslwrap-enabled 
    services. 

    As a workaround, it is also possible to disable SSLv2 in mod_ssl 
    (as described in our previous advisory SuSE-SA:2002:027; 
    http://www.suse.com/de/security/2002_027_openssl.html), but you 
    should be aware that this does not protect other SSL based servers 
    that may be running on your machine. 

    We have received numerous inquiries from SuSE users on whether the 
    update packages provided by SuSE as part of SA:2002:027 fix this bug 
    even though they do not contain the latest OpenSSL version recommended 
    in various advisories. 

    To clarify this, we would like to state that these packages DO FIX 
    the bug exploited by the Slapper worm. Following established policy, 
    we did this by applying a source code patch instead of upgrading to 
    a newer version, because the latter usually causes serious problems 
    for many users (in particular, different versions of OpenSSL libraries 
    are not always API compatible). 

    However, it turns out that a number of packages were statically 
    linked against OpenSSL libraries: 

    mod_ssl (SuSE Linux 7.0): 
            We have released rebuilt mod_ssl packages linked against the 
        most recent OpenSSL libraries. 

        If you run mod_ssl on SuSE Linux 7.0, you must upgrade mod_ssl, 
        too. 

    sendmail-tls (SuSE Linux 7.1, 7.2, 7.3): 
        Sendmail-tls, the SSL enabled version of sendmail, was linked 
        statically against OpenSSL on SuSE 7.1, 7.2 and 7.3. The security 
        impact of this problem is probably the same as with Apache and 
        mod_ssl. 

        We are releasing rebuilt packages linked against the most 
        OpenSSL libraries. 

        Sendmail-tls is not part of the default installation profile. 

        If you are using sendmail-tls, we strongly recommend you upgrade 
        to the latest packages provided on our FTP servers. 

    openssh (SuSE Linux 7.1, 7.2 and 7.3): 
        Ssh and sshd do not use any SSL functionality, and thus are not 
        susceptible to the type of attack carried out by the Slapper worm. 

        To date, we are not aware of any way to exploit them. We nevertheless 
        recommend to upgrade to the latest versions provided on our FTP site. 

    freeswan (SuSE Linux 7.1, 7.2): 
            FreeSWAN includes a utility named fswcert for creating and 
        manipulating X.509 certificates, which is also linked statically 
        against libcrypto. 

        To date, we are not aware of any way to exploit them. We 
        nevertheless recommend to upgrade to the latest versions provided 
        on our FTP site as soon as they become available (2002 Sep 20). 

______________________________________________________________________________ 

2) Pending vulnerabilities in SuSE Distributions and Workarounds: 
    
    mod_php4: 
            we are preparing an update of mod_php4 addressing various 
        vulnerabilities that have been published recently. 

______________________________________________________________________________ 

3) standard appendix: authenticity verification, additional information 

  - Package authenticity verification: 

    SuSE update packages are available on many mirror ftp servers all over 
    the world. While this service is being considered valuable and important 
    to the free and open source software community, many users wish to be 
    sure about the origin of the package and its content before installing 
    the package. There are two verification methods that can be used 
    independently from each other to prove the authenticity of a downloaded 
    file or rpm package: 
    1) md5sums as provided in the (cryptographically signed) announcement. 
    2) using the internal gpg signatures of the rpm package. 

    1) execute the command 
        md5sum <name-of-the-file.rpm> 
       after you downloaded the file from a SuSE ftp server or its mirrors. 
       Then, compare the resulting md5sum with the one that is listed in the 
       announcement. Since the announcement containing the checksums is 
       cryptographically signed (usually using the key security@suse.de), 
       the checksums show proof of the authenticity of the package. 
       We disrecommend to subscribe to security lists which cause the 
       email message containing the announcement to be modified so that 
       the signature does not match after transport through the mailing 
       list software. 
       Downsides: You must be able to verify the authenticity of the 
       announcement in the first place. If RPM packages are being rebuilt 
       and a new version of a package is published on the ftp server, all 
       md5 sums for the files are useless. 

    2) rpm package signatures provide an easy way to verify the authenticity 
       of an rpm package. Use the command 
        rpm -v --checksig <file.rpm> 
       to verify the signature of the package, where <file.rpm> is the 
       filename of the rpm package that you have downloaded. Of course, 
       package authenticity verification can only target an uninstalled rpm 
       package file. 
       Prerequisites: 
        a) gpg is installed 
        b) The package is signed using a certain key. The public part of this 
           key must be installed by the gpg program in the directory 
           ~/.gnupg/ under the user's home directory who performs the 
           signature verification (usually root). You can import the key 
           that is used by SuSE in rpm packages for SuSE Linux by saving 
           this announcement to a file ("announcement.txt") and 
           running the command (do "su -" to be root): 
            gpg --batch; gpg < announcement.txt | gpg --import 
           SuSE Linux distributions version 7.1 and thereafter install the 
           key "build@suse.de" upon installation or upgrade, provided that 
           the package gpg is installed. The file containing the public key 
           is placed at the toplevel directory of the first CD (pubring.gpg) 
           and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de . 

  - SuSE runs two security mailing lists to which any interested party may 
    subscribe: 

    suse-security@suse.com 
        - general/linux/SuSE security discussion. 
            All SuSE security announcements are sent to this list. 
            To subscribe, send an email to 
                <suse-security-subscribe@suse.com>. 

    suse-security-announce@suse.com 
        - SuSE's announce-only mailing list. 
            Only SuSE's security annoucements are sent to this list. 
            To subscribe, send an email to 
                <suse-security-announce-subscribe@suse.com>. 

    For general information or the frequently asked questions (faq) 
    send mail to: 
        <suse-security-info@suse.com> or 
        <suse-security-faq@suse.com> respectively. 

    ===================================================================== 
    SuSE's security contact is <security@suse.com> or <security@suse.de>. 
    The <security@suse.de> public key is listed below. 
    ===================================================================== 
______________________________________________________________________________ 

    The information in this advisory may be distributed or reproduced, 
    provided that the advisory is not modified in any way. In particular, 
    it is desired that the cleartext signature shows proof of the 
    authenticity of the text. 
    SuSE Linux AG makes no warranties of any kind whatsoever with respect 
    to the information contained in this security advisory. 

Type Bits/KeyID Date User ID 
pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de> 
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de> 

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