SuSE Security Announcement: lprold (SuSE-SA:2003:0014)

Type securityvulns
Reporter Securityvulns
Modified 2003-03-13T00:00:00


Republished because of a mistake. Thanks to an attentive user.


                    SuSE Security Announcement

    Package:                lprold
    Announcement-ID:        SuSE-SA:2003:0014
    Date:                   Thursday, Mar 13th 2003 16:58 MET
    Affected products:      7.1, 7.2, 7.3
                            SuSE eMail Server 3.1
                            SuSE eMail Server III
                            SuSE Firewall Adminhost VPN
                            SuSE Linux Admin-CD for Firewall
                            SuSE Firewall on CD 2 - VPN
                            SuSE Firewall on CD 2
                            SuSE Linux Enterprise Server for S/390
                            SuSE Linux Connectivity Server
                            SuSE Linux Enterprise Server 7
                            SuSE Linux Office Server
    Vulnerability Type:     local privilege escalation
    Severity (1-10):        3
    SuSE default package:   yes
    Cross References:

Content of this advisory:
    1) security vulnerability resolved: buffer overflow in lprm
       problem description, discussion, solution and upgrade information
    2) pending vulnerabilities, solutions, workarounds:
        - ethereal
        - qpopper
        - XFree4
        - sendmail
        - apcupsd
        - snort
        - file
        - zlib
        - vnc
    3) standard appendix (further information)

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

The lprm command of the printing package lprold shipped till SuSE 7.3
contains a buffer overflow. This buffer overflow can be exploited by
a local user, if the printer system is set up correctly, to gain root
lprold is installed as default package and has the setuid bit set.

As a temporary workaround you can disable the setuid bit of lprm by
executing the following tasks as root:
  - add "/usr/bin/lprm  root.root 755" to /etc/permissions.local
  - run 'chkstat -set /etc/permissions.local'
Another way would be to just allow trusted users to run lprm by
executing the following tasks as root:
  - add "/usr/bin/lprm  root.trusted 4750" to /etc/permissions.local
  - run 'chkstat -set /etc/permissions.local'

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.

Intel i386 Platform:

source rpm(s):

source rpm(s):

source rpm(s):

Sparc Platform:

source rpm(s):

AXP Alpha Platform:

source rpm(s):

PPC Power PC Platform:

source rpm(s):

source rpm(s):

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

- ethereal
  A format string bug in ethereal's SOCKS handling code and a buffer
  overflow in the NTLMSSP was found in ethereal. Both bugs may lead
  to remote system compromise.
  New packages are currently being build and will be available soon.

- qpopper
  In version 4.0.x of qpopper a buffer overflow *after* user authen-
  tication can be exploited to gain a shell on a POP-server machine.
  New packages are currently being build and will be available soon.

- XFree4
  A buffer overflow in the Xlib code can be triggered while handling
  the environment variable XLOCALEDIR. The X version affected is 4.2.0
  (SuSE Linux 8.0 and 8.1).
  We still investigate this issue.

- sendmail
  A correction is necessary to the last SuSE Security Announcement
  (SuSE-SA:2003:013) about sendmail: The Vulnerability Type must read
  remote buffer overflow.

- apcupsd
  The control and management daemon for APC UPS systems is vulnerable
  to remote code execution due to buffer overflow and format string bugs.
  A dedicated advisory for this issue will be released as soon as all
  packages are build.

- snort
  snort, a sensor-based Network Intrusion Detection System, was
  vulnerable to a buffer overflow in it's RPC preprocessor.
  As a workaround the following line in snort.conf should be commented
  out and snort should be restarted to disable the RPC-preprocessor:
    preprocessor rpc_decode: 111 32771
  Future version of SuSE Linux will be shipped with a fixed snort

- file
  A locally exploitable buffer overflow was found in the file command.
  New packages are currently being build and will be available soon.

- zlib
  zlib's function gzprintf() is prone to a buffer overflow if its
  arguments expand to more then Z_PRINTF_BUFSIZE bytes.
  A fixed version of zlib will be shipped with future SuSE Linux

- vnc
  VNC (Virtual Network Computing) uses a weak cookie generation process
  which can be exploited by an attacker to bypass authentication.
  New packages are currently being tested and will be available on our
  FTP servers soon.

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, 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 "" 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 .

  • SuSE runs two security mailing lists to which any interested party may subscribe: - general/linux/SuSE security discussion. All SuSE security announcements are sent to this list. To subscribe, send an email to <>. - 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 <>. 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.

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

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Bye, Thomas -- Thomas Biege <> SuSE Linux AG,Deutschherrnstr. 15-19,90429 Nuernberg Function: Security Support & Auditing "lynx -source | gpg --import" Key fingerprint = 7254 B15D B3C4 943F 485E 0BBD 8ECC D7CB C200 A213