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SuSE Security Announcement: suidperl (perl)

Aug 13, 2000, 22:48 (1 Talkback[s])
Date: Thu, 10 Aug 2000 12:36:28 +0200 (MEST)
From: Roman Drahtmueller 
To: suse-security-announce@suse.de
Subject: [suse-security-announce] SuSE Security Announcement: suidperl (perl)

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                        SuSE Security Announcement

        Package:                perl, all versions
        Date:                   Thursday, August 10th, 2000
        Affected SuSE versions: 6.0-6.4, 7.0
        Vulnerability Type:     local root compromise
        Severity (1-10):        5
        SuSE default package:   yes, but not configured exploitable.
        Other affected systems: all linux systems using this package

    Content of this advisory:
        1) security vulnerability resolved: suidperl (local root compromise)
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, temporary workarounds
           (Netscape)
        3) standard appendix (further information)




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

    suidperl is the perl interpreter for suid perl scripts, a part of the
    perl package. A maliciously implemented feature causes the interpreter
    to spawn the /bin/mail program to inform the superuser of its usage,
    thereby passing on untrusted environment that causes /bin/mail to
    execute arbitrary commands as user root.

    SuSE distributions are not susceptible to this problem because
    /usr/bin/suidperl is mode 755 (not suid) by default. Administrators
    must explicitly have enabled suidperl by changing the permission modes
    of the interpreter to 4755 root.root (suid root) for the exploit
    mechanism to work.
    
    In SuSE-Linux, activating suidperl is done by changing one of the
    files /etc/permissions.(easy|secure) and running SuSEconfig or
    `chkstat -set /etc/permissions.(easy|secure)', alternatively,
    depending on the setting of PERMISSION_SECURITY in /etc/rc.config.
    If SuSEconfig is turned off completely, the administrator of the
    system is obliged to change the permission modes by hand.
    The decision to not activate suidperl has been made because
    security problems were expected in the wild.
    O/S vendors have provided updated packages for both suidperl and
    mailx, the package containing /bin/mail. Basically, /bin/mail's
    fetures are not the origin of the security hole because the
    hostile environment is passed on by the suidperl interpreter,
    despite the fact that the interpreter runs suid root.

    Note: The upcoming SuSE-7.0 distribution _is_ vulnerable to the
          problem of this advisory if /usr/bin/suidperl is setuid root.
          However, suidperl is installed with mode 755 after the
          installation like in older SuSE Linux distributions and
          therefore can't be exploited without prior manual activation
          of suidperl by the system administrator.

    SuSE provides an updated package for the vulnerable software. It is
    strongly recommended to upgrade to the latest version found on our
    ftp server as described below. The package removes the mail
    notification and uses the syslog facility (priority warning) instead.

    Chose one of the following paths to download the package from our
    ftp server and install the package with the command `rpm -Fhv file.rpm'

    The md5sum for each file is in the line below.
    You can verify the integrity of the rpm files using the command
        `rpm --checksig --nogpg file.rpm', independently from the md5
    signatures below.

    i386 Intel Platform:

      SuSE-7.0
      ftp://ftp.suse.com/pub/suse/i386/update/7.0/a1/perl.rpm
        01c855f752b835536403c7bcc74d8114
      source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/perl.spm
        16c850efed03cc5bd5b9bff3910dd6e4

      SuSE-6.4
      ftp://ftp.suse.com/pub/suse/i386/update/6.4/a1/perl.rpm
        0640e11ba0b87f0d8a01b4b5dedbb8eb
      source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/perl.spm
        a68ade45a65e73805b2276ad35266d46

      SuSE-6.3
      ftp://ftp.suse.com/pub/suse/i386/update/6.3/a1/perl.rpm
        7a3c2adae0c556a7ccb647eaca34e6c7
      source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/perl.spm
        6bc207d360a1349f8f8067a83061f848

      SuSE-6.2
      ftp://ftp.suse.com/pub/suse/i386/update/6.2/a1/perl.rpm
        6403b21d3795def485ad4a577a38c3be
      source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/6.2/zq1/perl.spm
        47760a9798dc1489ca9fd2ee3a1756f6

      SuSE-6.1
      ftp://ftp.suse.com/pub/suse/i386/update/6.1/a1/perl.rpm
        ac14b4fccfb10e5465f377b095621730
      source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/6.1/zq1/perl.spm
        7d3aec7879fabcac3d2b7e4996340c31

    AXP Alpha Platform:
      SuSE-6.4
       ftp://ftp.suse.com/pub/suse/axp/update/6.4/a1/perl.rpm
        47853649c4683748558dbb72f759d739
      source rpm:
      ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/perl.spm
        5949a68b6126afdca98224cd6ed4be74
      SuSE-6.3
      ftp://ftp.suse.com/pub/suse/axp/update/6.3/a1/perl.rpm
        994804e426adf718df64162c92a1ce84
      source rpm:
      ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/perl.spm
        879238a9e443bbe32cc4d421ed9a5d28
      SuSE-6.1
      ftp://ftp.suse.com/pub/suse/axp/update/6.1/a1/perl.rpm
        cf2d763fb562a75395c5e613704cbd10
      source rpm:
      ftp://ftp.suse.com/pub/suse/axp/update/6.1/zq1/perl.spm
        e0aa5d0c91f474592e56eed2a8b3fae0

    PPC Power PC Platform:
      SuSE-6.4
      ftp://ftp.suse.com/pub/suse/ppc/update/6.4/a1/perl.rpm
        828a210ef2b3aa462161010d4d19416a
      source rpm:
      ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/perl.spm
        9253498d7c474ad2e9f8dabe576d2c96



2)  Pending vulnerabilities in SuSE Distributions and Workarounds

    This section addresses currently known vulnerabilities in Linux/Unix
    systems that have not been resolved up to the release date of this
    advisory.

    - Netscape, versions from 3.0 to 4.73:

        The latest version of Netscape is currently being tested. SuSE
        Netscape rpms contain efficient workarounds against some "morbid"
        properties of Netscape in order to provide stable packages.
        These additions are being reworked right now.
        Also, cryprographical software export regulations require us to
        wait for the permission to redistribute the netscape package from

        our US-American ftp server.
        There are currently two known vulnerabilities in Netscape versions
        from 3.0 to 4.73:
            a) a buffer overflow in the jpeg image handling code
            b) a security flaw in Netscape's Java implementation
        a) has been fixed in Netscape version 4.74. Updated packages
        from SuSE will follow very soon.
        Temporary fix/workaround:
            problem a) Turn off automatic image loading and do not
                       click on images to trigger the download. This may
                       be a fairly unsatisfying solution.
            problem b) Turn off Java and JavaScript.

    - ntop

        ntop is a network statistics visualization utility which offers
        graphical analysis of network traffic and other statistics with
        a web browser. By default, ntop listens on port 3000 and requires
        no or a commonly known authentication password to view the data.
        ntop is only installed in network server selections and is not
        activated by default in SuSE Linux installations.
        The ntop packages shipped with SuSE Linux did not exhibit the
        unsafe behaviour when a file like /../../etc/passwd is referenced.



3)  standard appendix:

    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 .

Regards,
Roman Drahtmueller



    The information in this advisory may be distributed or reproduced,
    provided that the advisory is not modified in any way.
    SuSE GmbH makes no warranties of any kind whatsoever with respect
    to the information contained in this security advisory.

Type Bits/KeyID    Date       User ID
pub  2048/3D25D3D9 1999/03/06 SuSE Security Team 

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