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Sicherheit: Unsichere ElGamal-Schlüssel in gnupg
Aktuelle Meldungen Distributionen
Name: Unsichere ElGamal-Schlüssel in gnupg
ID: MDKSA-2003:109
Distribution: Mandrake
Plattformen: Mandrake 9.0, Mandrake Multi Network Firewall 8.2, Mandrake Corporate Server 2.1, Mandrake 9.1, Mandrake 9.2
Datum: Sa, 29. November 2003, 12:00
Referenzen: http://lists.gnupg.org/pipermail/gnupg-announce/2003q4/000276.html
Applikationen: The GNU Privacy Guard

Originalnachricht

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_______________________________________________________________________

Mandrake Linux Security Update Advisory
_______________________________________________________________________

Package name: gnupg
Advisory ID: MDKSA-2003:109
Date: November 28th, 2003

Affected versions: 9.0, 9.1, 9.2, Corporate Server 2.1,
Multi Network Firewall 8.2
______________________________________________________________________

Problem Description:

A severe vulnerability was discovered in GnuPG by Phong Nguyen
relating to ElGamal sign+encrypt keys. From Werner Koch's email
message:

"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. Note that this is a real world vulnerability which will
reveal your private key within a few seconds.

Please *take immediate action and revoke your ElGamal signing keys*.
Furthermore you should take whatever measures necessary to limit the
damage done for signed or encrypted documents using that key."

And also:

"Note that the standard keys as generated by GnuPG (DSA and ElGamal
encryption) as well as RSA keys are NOT vulnerable. Note also that
ElGamal signing keys cannot be generated without the use of a special
flag to enable hidden options and even then overriding a warning
message about this key type. See below for details on how to identify
vulnerable keys."

MandrakeSoft urges any users who use the ElGamal sign+encrypt keys to
immediately revoke these keys and discontinue use of them. Updated
packages are provided that remove the ability to create these keys and
to create signatures using these keys (thanks to David Shaw for
writing the patch).
_______________________________________________________________________

References:

http://lists.gnupg.org/pipermail/gnupg-announce/2003q4/000276.html
______________________________________________________________________

Updated Packages:

Corporate Server 2.1:
d134c826e4fae506ccde3be7686888bc
corporate/2.1/RPMS/gnupg-1.0.7-3.2.C21mdk.i586.rpm
9294c6b3587a3a177b1d7ac57c1a0db2
corporate/2.1/SRPMS/gnupg-1.0.7-3.2.C21mdk.src.rpm

Corporate Server 2.1/x86_64:
7c4be5a2e952dd10c10f9242b91b51de
x86_64/corporate/2.1/RPMS/gnupg-1.0.7-3.2.C21mdk.x86_64.rpm
9294c6b3587a3a177b1d7ac57c1a0db2
x86_64/corporate/2.1/SRPMS/gnupg-1.0.7-3.2.C21mdk.src.rpm

Mandrake Linux 9.0:
f4f876cd0988362fba3718450727fd95 9.0/RPMS/gnupg-1.0.7-3.2.90mdk.i586.rpm
a459cb6e80e56562eac4a40a2ece3777 9.0/SRPMS/gnupg-1.0.7-3.2.90mdk.src.rpm

Mandrake Linux 9.1:
cdec75d7675fdb36874e61795800f582 9.1/RPMS/gnupg-1.2.2-1.2.91mdk.i586.rpm
08bba4f56d5d5eb581be7170e058133a 9.1/SRPMS/gnupg-1.2.2-1.2.91mdk.src.rpm

Mandrake Linux 9.1/PPC:
4c41071186f40d9895a1032ced8d0601 ppc/9.1/RPMS/gnupg-1.2.2-1.2.91mdk.ppc.rpm
08bba4f56d5d5eb581be7170e058133a ppc/9.1/SRPMS/gnupg-1.2.2-1.2.91mdk.src.rpm

Mandrake Linux 9.2:
03d66699b92149590b078298063a1744 9.2/RPMS/gnupg-1.2.3-3.1.92mdk.i586.rpm
0f5d1244d156a0b229c0d27e07c67b35 9.2/SRPMS/gnupg-1.2.3-3.1.92mdk.src.rpm

Multi Network Firewall 8.2:
b59a3c9a6c27c8d0c52e7a83d1ca3c75 mnf8.2/RPMS/gnupg-1.0.7-3.2.M82mdk.i586.rpm
d4dbfe3968a94705f7a7e175e00d03c9 mnf8.2/SRPMS/gnupg-1.0.7-3.2.M82mdk.src.rpm
_______________________________________________________________________

To upgrade automatically use MandrakeUpdate or urpmi. The verification
of md5 checksums and GPG signatures is performed automatically for you.

A list of FTP mirrors can be obtained from:

http://www.mandrakesecure.net/en/ftp.php

All packages are signed by MandrakeSoft for security. You can obtain
the GPG public key of the Mandrake Linux Security Team by executing:

gpg --recv-keys --keyserver www.mandrakesecure.net 0x22458A98

Please be aware that sometimes it takes the mirrors a few hours to
update.

You can view other update advisories for Mandrake Linux at:

http://www.mandrakesecure.net/en/advisories/

MandrakeSoft has several security-related mailing list services that
anyone can subscribe to. Information on these lists can be obtained by
visiting:

http://www.mandrakesecure.net/en/mlist.php

If you want to report vulnerabilities, please contact

security_linux-mandrake.com

Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team
<security linux-mandrake.com>
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=bcUF
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