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
Copyright	Copyright (c) 2005 E-Soft Inc. http://www.securityspace.com

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