Date: Thu, 19 Oct 2000 11:14:17 -0600
From: Caldera Support Info sup-info@LOCUTUS4.CALDERASYSTEMS.COM
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: Security Update: verification bug in gnupg
Caldera Systems, Inc. Security Advisory
Subject: verification bug in gnupg
Advisory number: CSSA-2000-038.0
Issue date: 2000 October, 18
Cross reference:
1. Problem Description
There is a bug in the signature verification of GNUpg, the GNU
replacement for PGP.
Normally, signature verification with gnupg works as expected;
gnupg properly detects when digitally signed data has been tampered
with.
However, these checks do not work properly if there are several
sections with inline signatures within a single file. In this case,
GNUpg does not always detect when some of the signed portions have
been modified, and incorrectly claims that all signatures are
valid.
2. Vulnerable Versions
System Package
-----------------------------------------------------------
OpenLinux Desktop 2.3 not vulnerable
OpenLinux eServer 2.3 not vulnerable
and OpenLinux eBuilder
OpenLinux eDesktop 2.4 All packages previous to
gnupg-1.0.4-2
3. Solution
Workaround:
None
4. OpenLinux Desktop 2.3
not vulnerable
5. OpenLinux eServer 2.3 and OpenLinux eBuilder for ECential
3.0
not vulnerable
6. OpenLinux eDesktop 2.4
6.1 Location of Fixed Packages
The upgrade packages can be found on Caldera’s FTP site at:
ftp://ftp.calderasystems.com/pub/updates/eDesktop/2.4/current/RPMS/
The corresponding source code package can be found at:
ftp://ftp.calderasystems.com/pub/updates/eDesktop/2.4/current/SRPMS
6.2 Verification
3892693d729a46acc587dcece5a59f7c RPMS/gnupg-1.0.4-2.i386.rpm
407234b6c1381ed0e4e22ae99b88ba3f SRPMS/gnupg-1.0.4-2.src.rpm
6.3 Installing Fixed Packages
Upgrade the affected packages with the following commands:
rpm -Fhv gnupg-1.0.4-2.i386.rpm
7. References
This and other Caldera security resources are located at:
http://www.calderasystems.com/support/security/index.html
This security fix closes Caldera’s internal Problem Report
7996.
8. Disclaimer
Caldera Systems, Inc. is not responsible for the misuse of any
of the information we provide on this website and/or through our
security advisories. Our advisories are a service to our customers
intended to promote secure installation and use of Caldera
OpenLinux.
9. Acknowledgements
Caldera Systems wishes to thank Werner Koch, the author of
GNUpg, for his work, and cooperation.