From bugzilla@redhat.com Fri Aug 8 16:53:16 2003 From: bugzilla@redhat.com To: redhat-watch-list@redhat.com, bugtraq@securityfocus.com, full-disclosure@lists.netsys.com Date: Fri, 8 Aug 2003 12:36 -0400 Subject: [Full-Disclosure] [RHSA-2003:255-01] up2date improperly checks GPG signature of packages [ The following text is in the "iso-8859-1" character set. ] [ Your display is set for the "US-ASCII" character set. ] [ Some characters may be displayed incorrectly. ] -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - --------------------------------------------------------------------- Red Hat Security Advisory Synopsis: up2date improperly checks GPG signature of packages Advisory ID: RHSA-2003:255-01 Issue date: 2003-08-08 Updated on: 2003-08-08 Product: Red Hat Linux Keywords: up2date gpg Red Hat Network RHN rpm Cross references: Obsoletes: CVE Names: CAN-2003-0546 - --------------------------------------------------------------------- 1. Topic: Updated up2date packages for Red Hat Linux 8.0 and 9 fix RPM GPG signature verification. 2. Relevant releases/architectures: Red Hat Linux 8.0 - i386 Red Hat Linux 9 - i386 3. Problem description: The Red Hat Update Agent, up2date, automatically queries the Red Hat Network servers and determines which packages need to be updated on your machine. up2date versions 3.0.7 and 3.1.23 incorrectly check RPM GPG signatures. These are the versions found in Red Hat Linux 8.0 and 9. This bug allows packages which have no GPG signature to be installed by up2date if they are provided by the Red Hat Network servers. The intended behaviour is that only packages signed with the Red Hat package signing key will be installed. For an attacker to make use of this flaw, they would have to make unsigned packages appear on the Red Hat Network. Connections to the Red Hat Network servers are authenticated and verified by the use of SSL, so it is not possible to intercept the connection to Red Hat Network servers and give unsigned packages. To make use of this flaw, an attacker would have to compromise the Red Hat Network servers at Red Hat. Because of these factors, the risk of exploiting this bug is low. However, we advise that all users of up2date update to these erratum packages. Note that all other variations of package signature checks work correctly. The fix was to change the code so that packages with no GPG signature are rejected in the same way as those with bad GPG signatures (the up2date client refuses to install them). Red Hat would like to thank Barry Nathan for finding and reporting this error. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. To update all RPMs for your particular architecture, run: rpm -Fvh [filenames] where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs. Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. 5. RPMs required: Red Hat Linux 8.0: SRPMS: ftp://updates.redhat.com/8.0/en/os/SRPMS/up2date-3.0.7.1-2.src.rpm i386: ftp://updates.redhat.com/8.0/en/os/i386/up2date-3.0.7.1-2.i386.rpm ftp://updates.redhat.com/8.0/en/os/i386/up2date-gnome-3.0.7.1-2.i386.rpm Red Hat Linux 9: SRPMS: ftp://updates.redhat.com/9/en/os/SRPMS/up2date-3.1.23.1-5.src.rpm i386: ftp://updates.redhat.com/9/en/os/i386/up2date-3.1.23.1-5.i386.rpm ftp://updates.redhat.com/9/en/os/i386/up2date-gnome-3.1.23.1-5.i386.rpm 6. Verification: MD5 sum Package Name - -------------------------------------------------------------------------- 606193c00a7fb419b4952b68f1245082 8.0/en/os/SRPMS/up2date-3.0.7.1-2.src.rpm be91944cf454244846a96b94a3efaa74 8.0/en/os/i386/up2date-3.0.7.1-2.i386.rpm 0adeb9cf7fff1754d183894fa40111bc 8.0/en/os/i386/up2date-gnome-3.0.7.1-2.i386.rpm 99d3b05223b596cf8d949c27b48e2ebd 9/en/os/SRPMS/up2date-3.1.23.1-5.src.rpm c6e89c3f118b5734a34d7275d8156596 9/en/os/i386/up2date-3.1.23.1-5.i386.rpm bf0b79cfeaaa6ed947609a27da5c2d65 9/en/os/i386/up2date-gnome-3.1.23.1-5.i386.rpm These packages are GPG signed by Red Hat for security. Our key is available from http://www.redhat.com/security/keys.html You can verify each package with the following command: rpm --checksig -v If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command: md5sum 7. References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0546 8. Contact: The Red Hat security contact is . More contact details at http://www.redhat.com/solutions/security/news/contact.html Copyright 2003 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (GNU/Linux) iD8DBQE/M9GWXlSAg2UNWIIRAvj6AJ9vxYutNeN6thdPT+ahlT1znB/eGQCdHXD+ xaGoUfY5bmYFoCJXN+gU158= =x/iL -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html