DSA 851-1: New openvpn packages fix denial of service
Posted on: 10/09/2005 03:22 AM

The Debian Security Team published a new security update for Debian GNU/Linux. Here the announcement:

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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
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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
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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
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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.

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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 lt;pkggt;' and http://packages.debian.org/lt;pkggt;

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