GnuPG Multiple Signed Message Modification Vulnerability

BID:1797

Info

GnuPG Multiple Signed Message Modification Vulnerability

Bugtraq ID: 1797
Class: Design Error
CVE:
Remote: Yes
Local: No
Published: Oct 12 2000 12:00AM
Updated: Oct 12 2000 12:00AM
Credit: First posted to Bugtraq by Jim Small <[email protected]> on October 11, 2000. Followup posted to Bugtraq by Werner Koch <[email protected]> on Oct 13, 2000.
Vulnerable: GNU GNU Privacy Guard 1.0.3
GNU GNU Privacy Guard 1.0.2
GNU GNU Privacy Guard 1.0.1
GNU GNU Privacy Guard 1.0
Not Vulnerable: GNU GNU Privacy Guard 1.0.3 b

Discussion

GnuPG Multiple Signed Message Modification Vulnerability

GnuPG is an open-source public/private key encryption system. There is a serious vulnerability in all versions of GnuPG below version 1.0.3b involving verifying the integrity of files with multiple signed messages. When verifying the integrity of these multiple-message files, GnuPG fails to verify each signature, rather flagging the document as either valid or invalid (integrity wise) based on the first message and signature. As a result, it is possible for an attacker to make modifications to signed messages within these files that will go unnoticed by GnuPG so long as the first signed message remains intact. More detailed technical information is available in Werner Koch's post to Bugtraq on the subject.

Exploit / POC

GnuPG Multiple Signed Message Modification Vulnerability

See discussion.

Solution / Fix

GnuPG Multiple Signed Message Modification Vulnerability

Solution:
A snapshot of the updated GnuPG source tree is available at:

ftp://ftp.guug.de/gcrypt/devel/gnupg-1.0.3b.tar.gz (1681k)
ftp://ftp.guug.de/gcrypt/devel/gnupg-1.0.3b.tar.gz.sig

Trustix recently released several updated packages:

RedHat

iputils: Fixes serveral problems in ping including a buffer overflow.
gnupg: Fixed a serious bug which could lead to false signature verification results when more than one signature is fed to gpg.

ypbind: Local root exploit. Linux ypbind

Users of TSL 1.0x and 1.1 that worry about local security should
definitely upgrade.

MD5sums:
9e2bbf3ddd728da4cbab3ece1ba390b7 gnupg-1.0.4-2tr.i586.rpm
43d503eb306f202c794ca064980574ad iputils-20001011-1tr.i586.rpm
8625657f6edea52b88e0cff1dfff4bb4 ypbind-3.3-29tr.i586.rpm

Get them at:
ftp://ftp.trustix.com/pub/Trustix/updates/1.1/RPMS/ or
http://www.trustix.net/download/Trustix/updates/1.1/RPMS/

Conectiva Linux:

ftp://atualizacoes.conectiva.com.br/4.0/SRPMS/gnupg-1.0.4-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.0/i386/gnupg-1.0.4-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/SRPMS/gnupg-1.0.4-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/i386/gnupg-1.0.4-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.1/SRPMS/gnupg-1.0.4-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.1/i386/gnupg-1.0.4-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.2/SRPMS/gnupg-1.0.4-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.2/i386/gnupg-1.0.4-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/gnupg-1.0.4-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/gnupg-1.0.4-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/gnupg-1.0.4-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/gnupg-1.0.4-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/gnupg-1.0.4-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/gnupg-1.0.4-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/gnupg-1.0.4-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/gnupg-1.0.4-1cl.i386.rpm


GNU GNU Privacy Guard 1.0

GNU GNU Privacy Guard 1.0.1

GNU GNU Privacy Guard 1.0.2

GNU GNU Privacy Guard 1.0.3

References

GnuPG Multiple Signed Message Modification Vulnerability

References:
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