Articles / Debian: New openvpn package…

Debian: New openvpn packages fix denial of service

Several security related problems have been discovered in openvpn, a Virtual Private Network daemon. Wrong processing of failed certificate authentication when running with "verb 0" and without TLS authentication can lead to a denial of service by disconnecting the wrong client. Wrong handling of packets that can't be decrypted on the server can lead to the disconnection of unrelated clients. When running in "dev tap" Ethernet bridging mode, openvpn can exhaust its memory by receiving a large number of spoofed MAC addresses and hence denying service. Simultaneous TCP connections from multiple clients with the same client certificate can cause a denial of service when --duplicate-cn is not enabled. Fixed packages are available from security.debian.org.
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Debian Security Advisory DSA 851-1                     security@debian.org
http://www.debian.org/security/                             Martin Schulze
October 9th, 2005                       http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : openvpn
Vulnerability  : programming errors
Problem type   : remote
Debian-specific: no
CVE ID         : CAN-2005-2531 CAN-2005-2532 CAN-2005-2533 CAN-2005-2534
Debian Bug     : 324167

Several security related problems have been discovered in openvpn, a
Virtual Private Network daemon.  The Common Vulnerabilities and
Exposures project identifies the following problems:

CAN-2005-2531

   Wrong processing of failed certificate authentication when running
   with "verb 0" and without TLS authentication can lead to a denial
   of service by disconnecting the wrong client.

CAN-2005-2532

   Wrong handling of packets that can't be decrypted on the server
   can lead to the disconnection of unrelated clients.

CAN-2005-2533

   When running in "dev tap" Ethernet bridging mode, openvpn can
   exhaust its memory by receiving a large number of spoofed MAC
   addresses and hence denying service.

CAN-2005-2534

   Simultaneous TCP connections from multiple clients with the same
   client certificate can cause a denial of service when
   --duplicate-cn is not enabled.

The old stable distribution (woody) does not contain openvpn packages.

For the stable distribution (sarge) these problems have been fixed in
version 2.0-1sarge1.

For the unstable distribution (sid) these problems have been fixed in
version 2.0.2-1.

We recommend that you upgrade your openvpn package.


Upgrade Instructions
- --------------------

wget url
       will fetch the file for you
dpkg -i file.deb
       will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
       will update the internal database
apt-get upgrade
       will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian GNU/Linux 3.1 alias sarge
- --------------------------------

 Source archives:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1.dsc
     Size/MD5 checksum:      629 1fee867074a153eac1f82d11e75aa833
   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1.diff.gz
     Size/MD5 checksum:    51566 578da11dd408ea72e4791646e700dac4
   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0.orig.tar.gz
     Size/MD5 checksum:   639201 7401faebc6baee9add32608709c54eec

 Alpha architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_alpha.deb
     Size/MD5 checksum:   347184 ed8f3706d9f7af8b4baf148786141e5a

 AMD64 architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_amd64.deb
     Size/MD5 checksum:   316422 3dfdd5a007c62ceb28153e63677a884a

 ARM architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_arm.deb
     Size/MD5 checksum:   296464 20f23e0a9f251eedc340e926f455c8e0

 Intel IA-32 architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_i386.deb
     Size/MD5 checksum:   302424 fe92352695fd5fdfa85a4ffea6b7cffe

 Intel IA-64 architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_ia64.deb
     Size/MD5 checksum:   395514 04207a2bfd92cd56c79a4d434f514bee

 HP Precision architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_hppa.deb
     Size/MD5 checksum:   316716 8065982ef523c653e8d25bedf716fb03

 Motorola 680x0 architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_m68k.deb
     Size/MD5 checksum:   276388 33de460a73afad6cb44a6753ea862c27

 Big endian MIPS architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_mips.deb
     Size/MD5 checksum:   317632 d8f4dd1ea4fce2c4c48a3e096d3da12c

 Little endian MIPS architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_mipsel.deb
     Size/MD5 checksum:   319404 c9a918128a56462a98049b160bfeb9d0

 PowerPC architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_powerpc.deb
     Size/MD5 checksum:   308772 1f7300816c44924fc10b5ba6e59ff00c

 IBM S/390 architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_s390.deb
     Size/MD5 checksum:   307220 bf9b59dab82ff1bd49ce7b4a3c9f2d7f

 Sun Sparc architecture:

   http://security.debian.org/pool/updates/main/o/openvpn/openvpn_2.0-1sarge1_sparc.deb
     Size/MD5 checksum:   294696 503317cf10f2976dffa8d25056517925


 These files will probably be moved into the stable distribution on
 its next update.

- ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show ' and http://packages.debian.org/

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