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[CLA-2003:736] Conectiva Security Announcement - stunnel
From: Conectiva Updates <secure () conectiva com br>
Date: Fri, 5 Sep 2003 18:13:58 -0300

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CONECTIVA LINUX SECURITY ANNOUNCEMENT 
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PACKAGE   : stunnel
SUMMARY   : File descriptor leak and SIGCHLD DoS vulnerabilities
DATE      : 2003-09-05 18:09:00
ID        : CLA-2003:736
RELEVANT
RELEASES  : 7.0, 8, 9

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DESCRIPTION
 Stunnel is a wrapper for network connections. It can be used to
 tunnel an unencrypted network connection over a secure connection
 (encrypted using SSL or TLS) or to provide a secure means of
 connecting to services that do not natively support encryption.
 
 This update fixes two vulnerabilities that affect stunnel versions
 shipped with Conectiva Linux:
 
 1. SIGCHLD Denial of Service (CAN-2002-1563)[1]
 Henrik Eriksson found[2] a race in the code that handles the SIGCHLD
 signal. This vulnerability affects stunnel when configured to listen
 for incoming connections (instead of being invoked by inetd) and to
 start a new child process to handle each new connection. A remote
 attacker can exploit this vulnerability to bring the tunneled service
 down.
 
 2. File descriptor leak (CAN-2003-0740)[3]
 Steve Grubb found[4] a file descriptor leak vulnerability in versions
 prior to 3.26 of stunnel that allows a local attacker to hijack the
 stunnel server.
 
 Since this update brings a new version of stunnel (3.26), several
 other fixes and minor changes are included as well[5].


SOLUTION
 All stunnel users should upgrade.
 
 Please note that after the upgrade all instances of stunnel and all
 active network connections being served by it must be restarted
 manually.
 
 
 REFERENCES:
 1.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1563
 2.http://marc.theaimsgroup.com/?l=stunnel-users&m=103600188215117&w=2
 3.http://www.securityfocus.com/archive/1/335996
 4.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0740
 5.http://www.stunnel.org/news/


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/stunnel-3.26-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/stunnel-3.26-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/stunnel-3.26-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/stunnel-3.26-1U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/stunnel-3.26-21517U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/stunnel-3.26-21517U90_1cl.src.rpm


ADDITIONAL INSTRUCTIONS
 The apt tool can be used to perform RPM packages upgrades:

 - 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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Copyright (c) 2003 Conectiva Inc.
http://www.conectiva.com

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