SuSE Security Announcement: i4l (SuSE-SA:2002:030)

2002-08-13T00:00:00
ID SECURITYVULNS:DOC:3352
Type securityvulns
Reporter Securityvulns
Modified 2002-08-13T00:00:00

Description

-----BEGIN PGP SIGNED MESSAGE-----


                    SuSE Security Announcement

    Package:                i4l
    Announcement-ID:        SuSE-SA:2002:030
    Date:                   Mon Aug 12 11:00:00 CEST 2002
    Affected products:      7.3, 8.0,
                            SuSE Linux Database Server,
                            SuSE eMail Server 3.1,
                            SuSE eMail Server III,
                            SuSE Firewall Adminhost VPN,
                            SuSE Linux Admin-CD for Firewall,
                            SuSE Linux Live-CD for Firewall,
                            SuSE Linux Connectivity Server,
                            SuSE Linux Enterprise Server 7
    Vulnerability Type:     local privilege escalation
    Severity (1-10):        5
    SuSE default package:   Yes
    Other affected systems: No

Content of this advisory:
    1) security vulnerability resolved: buffer overflows in ipppd
       problem description, discussion, solution and upgrade information
    2) pending vulnerabilities, solutions, workarounds
    3) standard appendix (further information)

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

The i4l package contains several programs for ISDN maintenance and
connectivity on Linux. The ipppd program which is part of the package
contained various buffer overflows and format string bugs. Since ipppd
is installed setuid to root and executable by users of group 'dialout'
this may allow attackers with appropriate group membership to execute
arbitrary commands as root.
The i4l package is installed by default and also vulnerable if you do
not have a ISDN setup. The buffer overflows and format string bugs have
been fixed. We strongly recommend an update of the i4l package.
    If you do not consider updating the package it is also possible to
remove the setuid bit from /usr/sbin/ipppd as a temporary workaround.
    The SuSE Security Team is aware of a published exploit for ipppd
that gives a local attacker root privileges so you should either update
the package or remove the setuid bit from ipppd.

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.

i386 Intel Platform:

SuSE-8.0
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/i4l-2002.7.31-0.i386.rpm
  cfd29e3bfb2466dc15eafae8c8280b3d
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/i4l-2002.7.31-0.src.rpm
  fdb75de724d373dee4d21ce3e9be176e

SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/i4l-2002.7.23-0.i386.rpm
  1d5fff19d48eb1b0652c21c139fdf53d
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/i4l-2002.7.23-0.src.rpm
  b0b5ac3c6f03f848170a158b5fee4e72


Sparc Platform:

SuSE-7.3
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/i4l-2002.7.23-0.sparc.rpm
  2fd232a50e27055831fd35337e6d73e7
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/i4l-2002.7.23-0.src.rpm
  cdef29bad89fcc6c2e4d0be38377edfa


PPC Power PC Platform:

SuSE-7.3
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/i4l-2002.7.23-0.ppc.rpm
  90939fabf3b1fcd8dd143e969b830dea
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/i4l-2002.7.23-0.src.rpm
  220bb5b9c5f16605beff26b961eba11a

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- docbook
In past some distributors provided updates for their docbook packages
to fix a problem within the docbook configuration-files which allowed
evil input-files to create arbitrary files within the users scope. However
the supplied configuration-fixes can easily be circumvented by offering
certain style-sheet files along with the evil input-file.
Because of this fact SuSE does not offer updates for the docbook packages
but rather strongly recommends to not process untrusted files with the
docbook utilities.

- openldap2
Andrew McCall reported a problem within the openldap2 package which could
lead to a denial of service attack against the slapd server. This problem
has been fixed. New openldap2 packages will soon be available.

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 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-subscribe@suse.com>.

    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 <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 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.

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>

  • -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org

mQGiBDnu9IERBACT8Y35+2vv4MGVKiLEMOl9GdST6MCkYS3yEKeueNWc+z/0Kvff 4JctBsgs47tjmiI9sl0eHjm3gTR8rItXMN6sJEUHWzDP+Y0PFPboMvKx0FXl/A0d M+HFrruCgBlWt6FA+okRySQiliuI5phwqkXefl9AhkwR8xocQSVCFxcwvwCglVcO QliHu8jwRQHxlRE0tkwQQI0D+wfQwKdvhDplxHJ5nf7U8c/yE/vdvpN6lF0tmFrK XBUX+K7u4ifrZlQvj/81M4INjtXreqDiJtr99Rs6xa0ScZqITuZC4CWxJa9GynBE D3+D2t1V/f8l0smsuYoFOF7Ib49IkTdbtwAThlZp8bEhELBeGaPdNCcmfZ66rKUd G5sRA/9ovnc1krSQF2+sqB9/o7w5/q2qiyzwOSTnkjtBUVKn4zLUOf6aeBAoV6NM CC3Kj9aZHfA+ND0ehPaVGJgjaVNFhPi4x0e7BULdvgOoAqajLfvkURHAeSsxXIoE myW/xC1sBbDkDUIBSx5oej73XCZgnj/inphRqGpsb+1nKFvF+rQoU3VTRSBQYWNr YWdlIFNpZ25pbmcgS2V5IDxidWlsZEBzdXNlLmRlPohcBBMRAgAcBQI57vSBBQkD wmcABAsKAwQDFQMCAxYCAQIXgAAKCRCoTtronIAKyl8sAJ98BgD40zw0GHJHIf6d NfnwI2PAsgCgjH1+PnYEl7TFjtZsqhezX7vZvYCIRgQQEQIABgUCOnBeUgAKCRCe QOMQAAqrpNzOAKCL512FZvv4VZx94TpbA9lxyoAejACeOO1HIbActAevk5MUBhNe LZa/qM2JARUDBRA6cGBvd7LmAD0l09kBATWnB/9An5vfiUUE1VQnt+T/EYklES3t XXaJJp9pHMa4fzFa8jPVtv5UBHGee3XoUNDVwM2OgSEISZxbzdXGnqIlcT08TzBU D9i579uifklLsnr35SJDZ6ram51/CWOnnaVhUzneOA9gTPSr+/fT3WeVnwJiQCQ3 0kNLWVXWATMnsnT486eAOlT6UNBPYQLpUprF5Yryk23pQUPAgJENDEqeU6iIO9Ot 1ZPtB0lniw+/xCi13D360o1tZDYOp0hHHJN3D3EN8C1yPqZd5CvvznYvB6bWBIpW cRgdn2DUVMmpU661jwqGlRz1F84JG/xe4jGuzgpJt9IXSzyohEJB6XG5+D0BiF0E ExECAB0FAjxqqTQFCQoAgrMFCwcKAwQDFQMCAxYCAQIXgAAKCRCoTtronIAKyp1f AJ9dR7saz2KPNwD3U+fy/0BDKXrYGACfbJ8fQcJqCBQxeHvt9yMPDVq0B0W5Ag0E Oe70khAIAISR0E3ozF/la+oNaRwxHLrCet30NgnxRROYhPaJB/Tu1FQokn2/Qld/ HZnh3TwhBIw1FqrhWBJ7491iAjLR9uPbdWJrn+A7t8kSkPaF3Z/6kyc5a8fas44h t5h+6HMBzoFCMAq2aBHQRFRNp9Mz1ZvoXXcI1lk1l8OqcUM/ovXbDfPcXsUVeTPT tGzcAi2jVl9hl3iwJKkyv/RLmcusdsi8YunbvWGFAF5GaagYQo7YlF6UaBQnYJTM 523AMgpPQtsKm9o/w9WdgXkgWhgkhZEeqUS3m5xNey1nLu9iMvq9M/iXnGz4sg6Q 2Y+GqZ+yAvNWjRRou3zSE7Bzg28MI4sAAwYH/2D71Xc5HPDgu87WnBFgmp8MpSr8 QnSs0wwPg3xEullGEocolSb2c0ctuSyeVnCttJMzkukL9TqyF4s/6XRstWirSWaw JxRLKH6Zjo/FaKsshYKf8gBkAaddvpl3pO0gmUYbqmpQ3xDEYlhCeieXS5MkockQ 1sj2xYdB1xO0ExzfiCiscUKjUFy+mdzUsUutafuZ+gbHog1CN/ccZCkxcBa5IFCH ORrNjq9pYWlrxsEn6ApsG7JJbM2besW1PkdEoxak74z1senh36m5jQvVjA3U4xq1 wwylxadmmJaJHzeiLfb7G1ZRjZTsB7fyYxqDzMVul6o9BSwO/1XsIAnV1uuITAQY EQIADAUCOe70kgUJA8JnAAAKCRCoTtronIAKyksiAJsFB3/77SkH3JlYOGrEe1Ol 0JdGwACeKTttgeVPFB+iGJdiwQlxasOfuXyITAQYEQIADAUCPGqpWQUJCgCCxwAK CRCoTtronIAKyofBAKCSZM2UFyta/fe9WgITK9I5hbxxtQCfX+0ar2CZmSknn3co SPihn1+OBNyZAQ0DNuEtBAAAAQgAoCRcd7SVZEFcumffyEwfLTcXQjhKzOahzxpo omuF+HIyU4AGq+SU8sTZ/1SsjhdzzrSAfv1lETACA+3SmLr5KV40Us1w0UC64cwt A46xowVq1vMlH2Lib+V/qr3b1hE67nMHjysECVx9Ob4gFuKNoR2eqnAaJvjnAT8J /LoUC20EdCHUqn6v+M9t/WZgC+WNR8cq69uDy3YQhDP/nIan6fm2uf2kSV9A7ZxE GrwsWl/WX5Q/sQqMWaU6r4az98X3z90/cN+eJJ3vwtA+rm+nxEvyev+jaLuOQBDf ebh/XA4FZ35xmi+spdiVeJH4F/ubaGlmj7+wDOF3suYAPSXT2QAFEbQlU3VTRSBT ZWN1cml0eSBUZWFtIDxzZWN1cml0eUBzdXNlLmRlPokBFQMFEDbhLUfkWLKHsco8 RQEBVw4H/1vIdiOLX/7hdzYaG9crQVIk3QwaB5eBbjvLEMvuCZHiY2COUg5QdmPQ 8SlWNZ6k4nu1BLcv2g/pymPUWP9fG4tuSnlUJDrWGm3nhyhAC9iudP2u1YQY37Gb B6NPVaZiYMnEb4QYFcqv5c/r2ghSXUTYk7etd6SW6WCOpEqizhx1cqDKNZnsI/1X 11pFcO2N7rc6byDBJ1T+cK+F1Ehan9XBt/shryJmv04nli5CXQMEbiqYYMOu8iaA 8AWRgXPCWqhyGhcVD3LRhUJXjUOdH4ZiHCXaoF3zVPxpeGKEQY8iBrDeDyB3wHmj qY9WCX6cmogGQRgYG6yJqDalLqrDOdmJARUDBRA24S0Ed7LmAD0l09kBAW04B/4p WH3f1vQn3i6/+SmDjGzUu2GWGq6Fsdwo2hVM2ym6CILeow/K9JfhdwGvY8LRxWRL hn09j2IJ9P7H1Yz3qDf10AX6V7YILHtchKT1dcngCkTLmDgC4rs1iAAl3f089sRG BafGPGKv2DQjHfR1LfRtbf0P7c09Tkej1MP8HtQMW9hPkBYeXcwbCjdrVGFOzqx+ AvvJDdT6a+oyRMTFlvmZ83UV5pgoyimgjhWnM1V4bFBYjPrtWMkdXJSUXbR6Q7Pi RZWCzGRzwbaxqpl3rK/YTCphOLwEMB27B4/fcqtBzgoMOiaZA0M5fFoo54KgRIh0 zinsSx2OrWgvSiLEXXYKiEYEEBECAAYFAjseYcMACgkQnkDjEAAKq6ROVACgjhDM /3KM+iFjs5QXsnd4oFPOnbkAnjYGa1J3em+bmV2aiCdYXdOuGn4ZiQCVAwUQN7c7 whaQN/7O/JIVAQEB+QP/cYblSAmPXxSFiaHWB+MiUNw8B6ozBLK0QcMQ2YcL6+Vl D+nSZP20+Ja2nfiKjnibCv5ss83yXoHkYk2Rsa8foz6Y7tHwuPiccvqnIC/c9Cvz dbIsdxpfsi0qWPfvX/jLMpXqqnPjdIZErgxpwujas1n9016PuXA8K3MJwVjCqSKI RgQQEQIABgUCOhpCpAAKCRDHUqoysN/3gCt7AJ9adNQMbmA1iSYcbhtgvx9ByLPI DgCfZ5Wj+f7cnYpFZI6GkAyyczG09sE= =LRKC - -----END PGP PUBLIC KEY BLOCK-----

-----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv

iQEVAwUBPVeImney5gA9JdPZAQHucgf9FaNs22ccTGur7PSNRPY7XXR/UGiP3A8H qr2dAVMm1/9oTqTM20F+kYEl34cAG5DT3JnHocLYKTL3zZVDEW9QaM8xFBK4LWGp VH8Zjfg0m9UzYEKUJ7lu0B2lYByQUdwroqJ5BqKZOxEG7Oopa65rc8tI5iyGgdMr j+C1pBszdGS3oVBcA17gIMxJcrjgFrKYFMwnw9UgtpoZat+5qO2XJvf1O2ZQc+lU OJPZ8WmEzDs4BHaLEIH4xSAauR7PGr0t0NsraWVFT86AK2xJuKGZGX2oi552XxwV pEIHufu8MqGlN/Y3N+PxW38RLCcGsnj1y3NqChT4+GSOoQKNbwJWbg== =Ds1S -----END PGP SIGNATURE-----

-- ~ ~ perl self.pl ~ $='print"\$=\47$_\47;eval"';eval ~ krahmer@suse.de - SuSE Security Team ~