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Conectiva Linux Security Announcement: proftpd

Jan 10, 2002, 03:40 (0 Talkback[s])
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CONECTIVA LINUX SECURITY ANNOUNCEMENT 
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PACKAGE   : proftpd
SUMMARY   : proftpd DoS
DATE      : 2002-01-09 15:00:00
ID        : CLA-2002:450
RELEVANT
RELEASES  : 5.0, prg graficos, ecommerce, 5.1, 6.0, 7.0

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DESCRIPTION
 ProFTPD is a highly configurable FTP daemon written from scratch for
 Unix and Unix-like operating systems.
 
 This advisory addresses two security problems:
 
 1. ProFTPD was not forward resolving reverse-resolved hostnames. A
 remote attacker could explore this vulnerability[1] to bypass ProFTPD
 access control lists or have false information (client hostname)
 logged. It was discovered by Matthew S. Hallacy
 <poptix@techmonkeys.org>.
 
 2. A DoS vulnerability[2] was found by Frank Denis. By sending a
 malicious command to the server, a remote attacker could force the
 process to consume all CPU and memory resources available to it.
 Multiple attack instances could effectively bring the server down.
 
 This update also fixes a Segmentation Fault problem, found[3] by
 Mattias <surre1@hotmail.com>, which was further analyzed and
 considered by the developers as not exploitable.


SOLUTION
 As a workaround[4] for the second vulnerability, you can add a
 DenyFilter for "\*.*/" in the ProFTPD config file, which will catch
 most of the attack attempts.
 
 Although there is an effective workaround for the DoS vulnerability,
 it's recomended that all proftpd users do the upgrade. Notice that if
 you are running the ProFTPD server as a standalone process (not using
 inetd, which is the default configuration), you have to restart the
 server manually after the upgrade. Also, it's advised to restart the
 active connections in order to let a new server instance to be
 loaded.
 
 
 REFERENCES:
 1. http://www.securityfocus.com/bid/3310
 2. http://www.securityfocus.com/archive/1/169395
 3. http://www.securityfocus.com/archive/1/246331
 4. http://www.proftpd.org/critbugs.html


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/proftpd-1.2.5rc1-1U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/proftpd-1.2.5rc1-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/proftpd-doc-1.2.5rc1-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/proftpd-1.2.5rc1-1U51_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/proftpd-1.2.5rc1-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/proftpd-doc-1.2.5rc1-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/proftpd-1.2.5rc1-1U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/proftpd-1.2.5rc1-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/proftpd-doc-1.2.5rc1-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/proftpd-1.2.5rc1-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/proftpd-1.2.5rc1-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/proftpd-doc-1.2.5rc1-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/proftpd-1.2.5rc1-1U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/proftpd-1.2.5rc1-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/proftpd-doc-1.2.5rc1-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/proftpd-1.2.5rc1-1U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/proftpd-1.2.5rc1-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/proftpd-doc-1.2.5rc1-1U50_1cl.i386.rpm


ADDITIONAL INSTRUCTIONS
 Users of Conectiva Linux version 6.0 or higher may use apt to perform 
 upgrades of RPM packages:
 - add the following line to /etc/apt/sources.list if it is not there yet
   (you may also use linuxconf to do this):

 rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

 - run:                 apt-get update
 - after that, execute: apt-get upgrade

 Detailed instructions reagarding the use of apt and upgrade examples 
 can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en


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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at 
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en
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All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

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