From: secure@conectiva.com.br
To: conectiva-updates@papaleguas.conectiva.com.br,
linsec@lists.seifried.org, lwn@lwn.net, bugtraq@securityfocus.com,
security-alerts@linuxsecurity.com
Subject: [CLA-2002:450] Conectiva Linux Security Announcement - proftpd
Date: Wed, 9 Jan 2002 15:06:57 -0200
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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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