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Linux Advisory Watch: January 7th 2005 Print E-mail
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Source: LinuxSecurity.com Contributors - Posted by Benjamin D. Thomas   
Linux Advisory Watch This week, advisories were released for mplayer, samba, wxgtk, cups, htmlheadline, nasm, zip, pcal, tiff, namazu, imlib2, selinux, tetex, pcmcia, kernel, mysql, gpdf, hotplug, linpopup, firefox, shoutcast, mit-kbr5, xine, phpgroupware, xzgv, vilistextum, vim, mc, and fam. The distributors include Conectiva, Debian, Fedora, Gentoo, Mandrake, and Red Hat.


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Network and Host Mapping

In order to keep yourself secure you must understand your enemy. Prevention is the only protection from becoming the victim of a security exploit. The first step in doing this is to determine what services your servers offer, so you can secure them in the best manner possible. Network scanning can be used to determine potential communication channels. Mapping their existence facilitates the exchange of information with the host, and thus is quite useful for anyone wishing to explore their networked environment, including attackers.

Scanning, as a method for discovering exploitable communication channels, has been around for ages. The idea is to probe as many listeners as possible, and keep track of the ones that are receptive or useful. Once these listeners are found, means to exploit the host can be developed. Unnecessarily offering a particular service to a hacker means another avenue to exploit the host.

Many different types of scanning are currently available. These range from a simple ping test to see if the host is alive, network broadcasts, and even performing a "stealth" attack by manipulating the ICMP, TCP, or UDP information in a data packet, intentionally violating the protocol definition in an attempt to trick a firewall.

Becoming familiar with the tools and techniques an attacker might use to probe a network is the only way to know what information is available if someone attempts to mount an attack against us. Among the things that can be determined from port scanning a machine include:

  • Services a host is offering which can then be used to construct the appropriate attack based on information gathered from this process
  • If there is in fact a host at the IP address that is being scanned
  • A topology map of our network, which can be used to determine where firewalls and other hosts are positioned, trusted relationships between those hosts, and routing and DNS information.
  • Operating system identification, vendor release and version, as well as applications and their versions
  • Disclosure of the username and owner of any process connected via TCP, which can then be used to determine, for example, the username of which the web server is running

Linux Security Tip, by Ryan Maple:
http://www.linuxsecurity.com/content/view/117271/141/

 

LinuxSecurity.com Feature Extras:

A 2005 Linux Security Resolution - Year 2000, the coming of the new millennium, brought us great joy and celebration, but also brought great fear. Some believed it would result in full-scale computer meltdown, leaving Earth as a nuclear wasteland. Others predicted minor glitches leading only to inconvenience. The following years (2001-2004) have been tainted with the threat of terrorism worldwide.

State of Linux Security 2004 - In 2004, security continued to be a major concern. The beginning of the year was plagued with several kernel flaws and Linux vendor advisories continue to be released at an ever-increasing rate. This year, we have seen the reports touting Window's security superiority, only to be debunked by other security experts immediately after release. Also, Guardian Digital launched the new LinuxSecurity.com, users continue to be targeted by automated attacks, and the need for security awareness and education continues to rise.

 

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Take advantage of our Linux Security discussion list! This mailing list is for general security-related questions and comments. To subscribe send an e-mail to security-discuss-request@linuxsecurity.com with "subscribe" as the subject.

Thank you for reading the LinuxSecurity.com weekly security newsletter. The purpose of this document is to provide our readers with a quick summary of each week's most relevant Linux security headline.

   Conectiva
  Conectiva: mplayer vulnerabilities fix
  5th, January, 2005

iDEFENSE[2] found a buffer overflow vulnerability[3] due to an error in dynamically allocating memory and further investigation by mplayer team found more vulnerabilities. This announcement fixes these vulnerabilities.

http://www.linuxsecurity.com/content/view/117769
 
  Conectiva: Samba vulnerabilities fix
  6th, January, 2005

Remote exploitation of an integer overflow vulnerability[2] in the smbd daemon could allow an attacker to cause controllable heap corruption, leading to execution of arbitrary commands with root privileges.

http://www.linuxsecurity.com/content/view/117793
 
  Conectiva: wxgtk2 library vulnerabilities fix
  6th, January, 2005

Several vulnerabilities were found in libtiff, which may also be in wxGTK library, since it has a private copy of libtiff's source.

http://www.linuxsecurity.com/content/view/117794
 
   Debian
  Debian: CUPS arbitrary code execution fix
  31st, December, 2004

An iDEFENSE security researcher discovered a buffer overflow in xpdf, the Portable Document Format (PDF) suite. Similar code is present in the PDF processing part of CUPS. A maliciously crafted PDF file could exploit this problem, leading to the execution of arbitrary code.

http://www.linuxsecurity.com/content/view/117725
 
  Debian: htmlheadline insecure temporary files fix
  3rd, January, 2005

Javier Fern‡ndez-Sanguino Pe–a has discovered multiple insecure uses of temporary files that could lead to overwriting arbitrary files via a symlink attack.

http://www.linuxsecurity.com/content/view/117726
 
  Debian: nasm arbitrary code execution fix
  4th, January, 2005

Jonathan Rockway discovered a buffer overflow in nasm, the general-purpose x86 assembler, which could lead to the execution of arbitrary code when compiling a maliciously crafted assembler source file.

http://www.linuxsecurity.com/content/view/117756
 
  Debian: zip arbitrary code execution fix
  5th, January, 2005

A buffer overflow has been discovered in zip, the archiver for .zip files. When doing recursive folder compression the program did not check the resulting path length, which would lead to memory being overwritten. A malicious person could convince a user to create an archive containing a specially crafted path name, which could lead to the execution of arbitrary code.

http://www.linuxsecurity.com/content/view/117767
 
  Debian: pcal arbitrary code execution fix
  5th, January, 2005

Danny Lungstrom discovered two buffer overflows in pcal, a program to generate Postscript calendars, that could lead to the execution of arbitrary code when compiling a calendar.

http://www.linuxsecurity.com/content/view/117770
 
  Debian: tiff denial of service fix
  6th, January, 2005

Dmitry V. Levin discovered a buffer overflow in libtiff, the Tag Image File Format library for processing TIFF graphics files. Upon reading a TIFF file it is possible to crash the application, and maybe also to execute arbitrary code.

http://www.linuxsecurity.com/content/view/117780
 
  Debian: namazu2 cross-site scripting vulnerability fix
  6th, January, 2005

A cross-site scripting vulnerability has been discovered in namazu2, a full text search engine. An attacker could prepare specially crafted input that would not be sanitised by namazu2 and hence displayed verbatim for the victim.

http://www.linuxsecurity.com/content/view/117790
 
  Debian: imlib2 arbitrary code execution fix
  6th, January, 2005

Pavel Kankovsky discovered that several overflows found in the libXpm library were also present in imlib and imlib2, imaging libraries for X11. An attacker could create a carefully crafted image file in such a way that it could cause an application linked with imlib or imlib2 to execute arbitrary code when the file was opened by a victim.

http://www.linuxsecurity.com/content/view/117791
 
   Fedora
  Fedora: selinux-policy-targeted-1.17.30-2.62 update
  31st, December, 2004

Fix for postgres startup scripts.

http://www.linuxsecurity.com/content/view/117729
 
  Fedora: tetex-2.0.2-14FC2.1 update
  3rd, January, 2005

The updated tetex package fixes a buffer overflow which allows attackers to cause the internal xpdf library used by applications in tetex to crash, and possibly to execute arbitrary code. The Common Vulnerabilities and Exposures projects (cve.mitre.org) has assigned the name CAN-2004-1125 to this issue.

http://www.linuxsecurity.com/content/view/117742
 
  Fedora: tetex-2.0.2-21.2 update
  3rd, January, 2005

The updated tetex package fixes a buffer overflow which allows attackers to cause the internal xpdf library used by applications in tetex to crash, and possibly to execute arbitrary code. The Common Vulnerabilities and Exposures projects (cve.mitre.org) has assigned the name CAN-2004-1125 to this issue.

http://www.linuxsecurity.com/content/view/117743
 
  Fedora: pcmcia-cs-3.2.7-2.1 update
  3rd, January, 2005

This update fixes bug #135508, silencing a warning message on cardmgr startup.

http://www.linuxsecurity.com/content/view/117750
 
  Fedora: pcmcia-cs-3.2.7-1.8.2.2 update
  3rd, January, 2005

This update fixes bug #135508, silencing a warning message on cardmgr startup.

http://www.linuxsecurity.com/content/view/117751
 
  Fedora: kernel-2.6.9-1.11_FC2 update
  3rd, January, 2005

A large change over previous kernels has been made. The 4G:4G memory split patch has been dropped, and Fedora kernels now revert back to the upstream 3G:1G kernel/userspace split.

http://www.linuxsecurity.com/content/view/117752
 
  Fedora: kernel-2.6.9-1.724_FC3 update
  3rd, January, 2005

A large change over previous kernels has been made. The 4G:4G memory split patch has been dropped, and Fedora kernels now revert back to the upstream 3G:1G kernel/userspace split.

http://www.linuxsecurity.com/content/view/117753
 
  Fedora: mysql-3.23.58-14 update
  5th, January, 2005

work around SELinux restriction that breaks mysql_install_db (bug #141062). Add a restorecon to keep the mysql.log file in the right context (bz#143887). Fix init script to not need a valid username for startup check (bz#142328). Don't assume /etc/my.cnf will specify pid-file (bz#143724)

http://www.linuxsecurity.com/content/view/117777
 
  Fedora: man-pages-ja-20041215-1.FC3.0 update
  6th, January, 2005

prefer GNU fileutils's chown(1) rather than gnumaniak's. (#142077)

http://www.linuxsecurity.com/content/view/117783
 
  Fedora: ruby-1.8.2-1.FC3.0 update
  6th, January, 2005

New upstream release.

http://www.linuxsecurity.com/content/view/117784
 
  Fedora: man-pages-ja-20041215-1.FC2.0 update
  6th, January, 2005

ixed wrong filename for in.rlogind.8 man pages. prefer GNU fileutils's chown(1) rather than gnumaniak's.

http://www.linuxsecurity.com/content/view/117785
 
  Fedora: tetex-2.0.2-14FC2.1 update
  6th, January, 2005

The updated tetex package fixes a buffer overflow which allows attackers to cause the internal xpdf library used by applications in tetex to crash, and possibly to execute arbitrary code. The Common Vulnerabilities and Exposures projects (cve.mitre.org) has assigned the name CAN-2004-1125 to this issue.

http://www.linuxsecurity.com/content/view/117786
 
  Fedora: tetex-2.0.2-21.2 update
  6th, January, 2005

The updated tetex package fixes a buffer overflow which allows attackers to cause the internal xpdf library used by applications in tetex to crash, and possibly to execute arbitrary code. The Common Vulnerabilities and Exposures projects (cve.mitre.org) has assigned the name CAN-2004-1125 to this issue.

http://www.linuxsecurity.com/content/view/117787
 
  Fedora: gpdf-2.8.0-8.2 update
  6th, January, 2005

Applied patch to fix CAN-2004-1125 (bug #144210)

http://www.linuxsecurity.com/content/view/117788
 
  Fedora: gpdf-2.8.0-4.2.fc2 update
  6th, January, 2005

Applied patch to fix CAN-2004-1125 (bug #144210)

http://www.linuxsecurity.com/content/view/117789
 
  Fedora: hotplug-2004_04_01-8.1 update
  6th, January, 2005

This adds a fix to properly set the path for devices on USB removal.

http://www.linuxsecurity.com/content/view/117792
 
   Gentoo
  Gentoo: LinPopUp Buffer overflow in message reply
  4th, January, 2005

LinPopUp contains a buffer overflow potentially allowing execution of arbitrary code.

http://www.linuxsecurity.com/content/view/117760
 
  Gentoo: a2ps Insecure temporary files handling
  4th, January, 2005

The fixps and psmandup scripts in the a2ps package are vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.

http://www.linuxsecurity.com/content/view/117761
 
  Gentoo: Mozilla, Firefox, Thunderbird Various vulnerabilities
  5th, January, 2005

Various vulnerabilities were found and fixed in Mozilla-based products, ranging from a potential buffer overflow and temporary files disclosure to anti-spoofing issues.

http://www.linuxsecurity.com/content/view/117768
 
  Gentoo: shoutcast Remote code execution
  5th, January, 2005

Shoutcast Server contains a possible buffer overflow that could lead to the execution of arbitrary code.

http://www.linuxsecurity.com/content/view/117771
 
  Gentoo: mit-kbr5 Heap overflow in libkadm5srv
  5th, January, 2005

The MIT Kerberos 5 administration library (libkadm5srv) contains a heap overflow that could lead to execution of arbitrary code.

http://www.linuxsecurity.com/content/view/117778
 
  Gentoo: tiff New overflows in image decoding
  5th, January, 2005

An integer overflow has been found in the TIFF library image decoding routines and the tiffdump utility, potentially allowing arbitrary code execution.

http://www.linuxsecurity.com/content/view/117779
 
  Gentoo: xine-lib Multiple overflows
  6th, January, 2005

xine-lib contains multiple overflows potentially allowing execution of arbitrary code.

http://www.linuxsecurity.com/content/view/117781
 
  Gentoo: phpGroupWare Various vulnerabilities
  6th, January, 2005

Multiple vulnerabilities have been discovered in phpGroupWare that could lead to information disclosure or remote compromise.

http://www.linuxsecurity.com/content/view/117798
 
  Gentoo: xzgv Multiple overflows
  6th, January, 2005

xzgv contains multiple overflows that may lead to the execution of arbitrary code.

http://www.linuxsecurity.com/content/view/117806
 
  Gentoo: vilistextum Buffer overflow vulnerability
  6th, January, 2005

Vilistextum is vulnerable to a buffer overflow that allows an attacker to execute arbitrary code through the use of a malicious webpage.

http://www.linuxsecurity.com/content/view/117807
 
   Mandrake
  Mandrake: libtiff multiple vulnerabilities fix
  6th, January, 2005

Several vulnerabilities have been discovered in the libtiff package.

http://www.linuxsecurity.com/content/view/117801
 
  Mandrake: wcGTK2 vulnerabilities fix
  6th, January, 2005

Several vulnerabilities have been discovered in the libtiff package; wxGTK2 uses a libtiff code tree, so it may have the same vulnerabilities.

http://www.linuxsecurity.com/content/view/117802
 
  Mandrake: vim modeline vulnerabilities fix
  6th, January, 2005

Several "modeline"-related vulnerabilities were discovered in Vim by Ciaran McCreesh. The updated packages have been patched with Bram Moolenaar's vim 6.3.045 patch which fixes the reported vulnerabilities and adds more conservative "modeline" rights.

http://www.linuxsecurity.com/content/view/117803
 
  Mandrake: nasm buffer overflow vulnerability fix
  6th, January, 2005

A buffer overflow in nasm was discovered by Jonathan Rockway. This vulnerability could lead to the execution of arbitrary code when compiling a malicious assembler source file.

http://www.linuxsecurity.com/content/view/117804
 
  Mandrake: libtiff multiple vulnerabilities fix
  6th, January, 2005

Several vulnerabilities have been discovered in the libtiff package.

http://www.linuxsecurity.com/content/view/117805
 
   Red Hat
  Red Hat: mc security vulnerabilities fix
  5th, January, 2005

An updated mc package that resolves several shell escape security issues is now available.

http://www.linuxsecurity.com/content/view/117772
 
  Red Hat: fam security issue fix
  5th, January, 2005

Updated fam packages that fix an information disclosure bug are now available.

http://www.linuxsecurity.com/content/view/117773
 
  Red Hat: VIM security vulnerability fix
  5th, January, 2005

Updated vim packages that fix a modeline vulnerability are now available.

http://www.linuxsecurity.com/content/view/117774
 
  Red Hat: samba security issue fix
  5th, January, 2005

Updated samba packages that fix an integer overflow vulnerability are now available for Red Hat Enterprise Linux 2.1.

http://www.linuxsecurity.com/content/view/117775
 

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