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UNIRAS Brief - 77/04 - Debian Security Bulletin - New gnupg packages fix cryptographic weakness



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 77/04 dated 16.02.04  Time: 15:30  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

Debian Security Bulletin:

New gnupg packages fix cryptographic weakness.

Detail
====== 

Phong Nguyen identified a severe bug in the way GnuPG creates and uses ElGamal keys 
for signing.  This is a significant security failure which can lead to a compromise 
of almost all ElGamal keys used for signing.

The update provided in DSA 459-1 disables the use of this type of key, using an 
interim fix.  This update, DSA 459-2, implements a more correct and permanent fix. 




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Debian Security Advisory DSA 429-2                     security@xxxxxxxxxx
http://www.debian.org/security/                             Matt Zimmerman
February 13th, 2004                     http://www.debian.org/security/faq
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Package        : gnupg
Vulnerability  : cryptographic weakness
Problem-Type   : local
Debian-specific: no
CVE Ids        : CAN-2003-0971

Phong Nguyen identified a severe bug in the way GnuPG creates and uses ElGamal keys for signing.  This is a significant security failure which can lead to a compromise of almost all ElGamal keys used for signing.

The update provided in DSA 459-1 disables the use of this type of key, using an interim fix.  This update, DSA 459-2, implements a more correct and permanent fix provided by David Shaw.

For the current stable distribution (woody) this problem has been fixed in version 1.0.6-4woody3.

We recommend that you update your gnupg 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 3.0 alias woody
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  Source archives:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3.dsc
      Size/MD5 checksum:      577 f5a742233c584754c479daf7dfe58a9e
    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3.diff.gz
      Size/MD5 checksum:     5262 1ecf9f459e0b05c31128adac05ef2fe4
    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6.orig.tar.gz
      Size/MD5 checksum:  1941676 7c319a9e5e70ad9bc3bf0d7b5008a508

  Alpha architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_alpha.deb
      Size/MD5 checksum:  1150082 724d4fcb6f2ff0969b5ceba82e8aabe5

  ARM architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_arm.deb
      Size/MD5 checksum:   986748 8efdbc409f140c1aaefadb97646944d6

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_i386.deb
      Size/MD5 checksum:   966408 50e5e44b2efa34d7c7d3a8fd630dc96a

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_ia64.deb
      Size/MD5 checksum:  1271406 4c5e77defc13bf4bae3d11431257e6a3

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_hppa.deb
      Size/MD5 checksum:  1058822 02516b6984cf695ef31c970980d36864

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_m68k.deb
      Size/MD5 checksum:   942188 ed7d9d16820608b3172be64f6b470b97

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_mips.deb
      Size/MD5 checksum:  1035630 9b25dd3f06580549bfa93ee429605d0e

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_mipsel.deb
      Size/MD5 checksum:  1035864 740243a767cc1ff53f116d0e97aa66a7

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_powerpc.deb
      Size/MD5 checksum:  1009152 678b2fc28d01eac452d96f925d2d40b2

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_s390.deb
      Size/MD5 checksum:  1001666 c5a70add4dfa1cb3828d9892513d3c15

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_sparc.deb
      Size/MD5 checksum:  1003634 32490333505f1804e9fcf4a786fbc293

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

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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@xxxxxxxxxxxxxxxx
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>

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For additional information or assistance, please contact the HELP Desk by 
telephone or Not Protectively Marked information may be sent via 
EMail to: uniras@xxxxxxxxxxxx

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Tel: +44 (0) 20 7821 1330 and follow the prompts

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UNIRAS wishes to acknowledge the contributions of Debian for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
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Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
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with the usage of information contained within this notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>

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