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SuSE: curl buffer overflow in NTLM Print E-mail
User Rating:      How can I rate this item?
Posted by Benjamin D. Thomas   
SuSE infamous41md@hotpop.com reported a vulnerability in libcurl, the HTTP/FTP retrieval library. This library is used by lots of programs, including YaST2 and PHP4.
______________________________________________________________________________

                        SUSE Security Announcement

        Package:                curl
        Announcement-ID:        SUSE-SA:2005:011
        Date:                   Mon, 28 Feb 2005 12:00:00 +0000
        Affected products:      9.1, 9.2
                                SUSE Linux Enterprise Server 9
                                Novell Linux Desktop 9
        Vulnerability Type:     remote code execution
        Severity (1-10):        10
        SUSE default package:   yes
        Cross References:       CAN-2005-0490

    Content of this advisory:
        1) security vulnerability resolved:
             buffer overflow in curl NTLM authentication
           problem description
        2) solution/workaround
        3) special instructions and notes
        4) package location and checksums
        5) pending vulnerabilities, solutions, workarounds:
            See SUSE Security Summary Report.
        6) standard appendix (further information)

______________________________________________________________________________

1) problem description, brief discussion

    infamous41md@hotpop.com reported a vulnerability in libcurl, the
    HTTP/FTP retrieval library. This library is used by lots of programs,
    including YaST2 and PHP4.

    The NTLM authorization in curl had a buffer overflow in the base64
    decoding which allows a remote attacker using a prepared remote
    server to execute code for the user using curl.

    The Kerberos authorization has a similar bug, but is not compiled
    in on SUSE Linux.

    This is tracked by the Mitre CVE ID CAN-2005-0490.

2) solution/workaround

    None, please install the fixed packages.

3) special instructions and notes

    If you are using a service that uses libcurl, please restart this
    service.

    This list potentially includes the PHP4 support of the Apache and
    Apache2 web servers.

4) package location and checksums

    Please download the update package for your distribution and verify its
    integrity by the methods listed in section 3) of this announcement.
    Then, install the package using the command "rpm -Fhv file.rpm" to apply
    the update.
    Our maintenance customers are being notified individually. The packages
    are being offered to install from the maintenance web.

    
    x86 Platform:
    
    SUSE Linux 9.2:
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/curl-7.12.0-2.2.i586.rpm
           10bdaa686d6fbc08cbe4620c91e6f33b
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/curl-devel-7.12.0-2.2.i586.rpm
           fcab29842a028c41dbf5910a6b24c0e2
    
    SUSE Linux 9.1:
    ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/curl-7.11.0-39.4.i586.rpm
           285dc0e7bafa207c2ab5f1c3081e2cdc
    ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/curl-devel-7.11.0-39.4.i586.rpm
           f0d88e1e0c78a8db1ae9adce3607a18e
    
    x86-64 Platform:
    
    SUSE Linux 9.2:
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/curl-7.12.0-2.2.x86_64.rpm
           724387fba668aaf1f8772f5e45320676
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/curl-devel-7.12.0-2.2.x86_64.rpm
           0c53e24c16610908324f3f4bb51174bd
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/curl-7.12.0-2.2.src.rpm
           fb2533e28b02a5f2bdfe001e6c3c3d0a
    
    SUSE Linux 9.1:
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/curl-7.11.0-39.4.x86_64.rpm
           08ae9314b886b1e51b422943aa42d210
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/curl-devel-7.11.0-39.4.x86_64.rpm
           44ca3527474d574bfca573efe78cd259
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/curl-7.11.0-39.4.src.rpm
           f8b455755a9da06399cfbe10edcf2b9f


______________________________________________________________________________

5)  Pending vulnerabilities in SUSE Distributions and Workarounds:

    See SUSE Security Summary Report.

______________________________________________________________________________

6)  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 
       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 
       to verify the signature of the package, where  is the
       filename of the rpm package that you have downloaded. Of course,
       package authenticity verification can only target an un-installed 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 top-level 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-announce@suse.com
        -   SUSE's announce-only mailing list.
            Only SUSE's security announcements are sent to this list.
            To subscribe, send an email to
                .

    For general information or the frequently asked questions (faq) 
    send mail to:
         or
         respectively.

    =====================================================================
    SUSE's security contact is  or .
@suse.de>.
    The  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 clear-text 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.
 
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