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Test ID:1.3.6.1.4.1.25623.1.0.51490
Category:Conectiva Local Security Checks
Title:Conectiva Security Advisory CLA-2003:798
Summary:Conectiva Security Advisory CLA-2003:798
Description:
The remote host is missing updates announced in
advisory CLA-2003:798.

GnuPG[1] is an OpenPGP-compliant tool for secure communication used
to, for example, sign emails, encrypt, decrypt and verify (signed)
data.

Phong Nguyen discovered[2] a vulnerability (CVE-2003-0971[3]) in the
way GnuPG deals with type 20 ElGamal sign+encrypt keys which allows
an attacker to recover the corresponding private key from a
signature. Other keys, such as ElGamal type 16 used only for
encryption, are not affected.

This is a serious vulnerability with immediate impact: all ElGamal
type 20 keys should be revoked and considered to be compromised, as
well as data signed or encrypted with such a key.

Please note that:
- by default, GnuPG does not generate this type of key

- in order to create an ElGamal type 20 key, one must (in recent
versions of GnuPG) add the --expert command line option, and even
then a warning is given saying that this key should not be used. In
older versions, only the warning is given.

To identify the vulnerable type 20 ElGamal keys, look for the G
identifier in a key listing such as the example below:

pub 2048G/xxxxxxxx 2001-01-05 John Doe

Other keys (including the ones identified by g, lower case) are not
affected.

The packages provided with this update have a patch[4] created by
David Shaw which disables the creation of these keys and no longer
allows them to be used to create signatures.


Solution:
The apt tool can be used to perform RPM package upgrades
by running 'apt-get update' followed by 'apt-get upgrade'

http://www.gnupg.org/
http://lists.gnupg.org/pipermail/gnupg-announce/2003q4/000276.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0971
http://lists.gnupg.org/pipermail/gnupg-announce/2003q4/000277.html
http://www.securityspace.com/smysecure/catid.html?in=CLA-2003:798
http://distro.conectiva.com.br/atualizacoes/index.php?id=a&anuncio=002003

Risk factor : Medium
Cross-Ref: BugTraq ID: 9115
Common Vulnerability Exposure (CVE) ID: CVE-2003-0971
Bugtraq: 20031127 GnuPG's ElGamal signing keys compromised (Google Search)
http://marc.theaimsgroup.com/?l=bugtraq&m=106995769213221&w=2
http://www.mandriva.com/security/advisories?name=MDKSA-2003:109
Conectiva Linux advisory: CLA-2003:798
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000798
SGI Security Advisory: 20040202-01-U
ftp://patches.sgi.com/support/free/security/advisories/20040202-01-U.asc
SuSE Security Announcement: SuSE-SA:2003:048 (Google Search)
http://www.novell.com/linux/security/advisories/2003_048_gpg.html
http://www.redhat.com/support/errata/RHSA-2003-390.html
http://www.redhat.com/support/errata/RHSA-2003-395.html
Debian Security Information: DSA-429 (Google Search)
http://www.debian.org/security/2004/dsa-429
CERT/CC vulnerability note: VU#940388
http://www.kb.cert.org/vuls/id/940388
http://www.securityfocus.com/bid/9115
http://oval.mitre.org/repository/data/getDef?id=oval:org.mitre.oval:def:10982
http://secunia.com/advisories/10304
http://secunia.com/advisories/10349
http://secunia.com/advisories/10399
http://secunia.com/advisories/10400
CopyrightCopyright (c) 2005 E-Soft Inc. http://www.securityspace.com

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