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Category:   Application (Security)  >   GnuPG (Gnu Privacy Guard) Vendors:   Gnupg.org
(Red Hat Issues Fix) GnuPG Filename Input Validation Flaw Lets Remote Users Spoof Status Messages
SecurityTracker Alert ID:  1041277
SecurityTracker URL:  http://securitytracker.com/id/1041277
CVE Reference:   CVE-2018-12020   (Links to External Site)
Date:  Jul 12 2018
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in GnuPG. A remote user can spoof status messages.

A remote user can send a signed and encrypted email message that includes the specially crafted name of the original input file to trigger an input validation flaw in the processing of filenames when displaying the filename. This can be exploited to spoof status messages and fake the verification status of a signed email message.

Applications that use the GPGME library are not affected.

Marcus Brinkmann reported this vulnerability.

Impact:   A remote user can spoof status messages and fake the verification status of a signed email message.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:2181

Vendor URL:  access.redhat.com/errata/RHSA-2018:2181 (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Jun 10 2018 GnuPG Filename Input Validation Flaw Lets Remote Users Spoof Status Messages



 Source Message Contents

Subject:  [RHSA-2018:2181-01] Important: gnupg2 security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: gnupg2 security update
Advisory ID:       RHSA-2018:2181-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:2181
Issue date:        2018-07-11
CVE Names:         CVE-2018-12020 
=====================================================================

1. Summary:

An update for gnupg2 is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le, s390x
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, ppc64le, s390x

3. Description:

The GNU Privacy Guard (GnuPG or GPG) is a tool for encrypting data and
creating digital signatures, compliant with OpenPGP and S/MIME standards.

Security Fix(es):

* gnupg2: Improper sanitization of filenames allows for the display of fake
status messages and the bypass of signature verification (CVE-2018-12020)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1589620 - CVE-2018-12020 gnupg2: Improper sanitization of filenames allows for the display of fake status messages and the bypass of signature verification

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
gnupg2-2.0.22-5.el7_5.src.rpm

x86_64:
gnupg2-2.0.22-5.el7_5.x86_64.rpm
gnupg2-debuginfo-2.0.22-5.el7_5.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
gnupg2-debuginfo-2.0.22-5.el7_5.x86_64.rpm
gnupg2-smime-2.0.22-5.el7_5.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
gnupg2-2.0.22-5.el7_5.src.rpm

x86_64:
gnupg2-2.0.22-5.el7_5.x86_64.rpm
gnupg2-debuginfo-2.0.22-5.el7_5.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
gnupg2-debuginfo-2.0.22-5.el7_5.x86_64.rpm
gnupg2-smime-2.0.22-5.el7_5.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
gnupg2-2.0.22-5.el7_5.src.rpm

ppc64:
gnupg2-2.0.22-5.el7_5.ppc64.rpm
gnupg2-debuginfo-2.0.22-5.el7_5.ppc64.rpm

ppc64le:
gnupg2-2.0.22-5.el7_5.ppc64le.rpm
gnupg2-debuginfo-2.0.22-5.el7_5.ppc64le.rpm

s390x:
gnupg2-2.0.22-5.el7_5.s390x.rpm
gnupg2-debuginfo-2.0.22-5.el7_5.s390x.rpm

x86_64:
gnupg2-2.0.22-5.el7_5.x86_64.rpm
gnupg2-debuginfo-2.0.22-5.el7_5.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source:
gnupg2-2.0.22-5.el7_5.src.rpm

aarch64:
gnupg2-2.0.22-5.el7_5.aarch64.rpm
gnupg2-debuginfo-2.0.22-5.el7_5.aarch64.rpm

ppc64le:
gnupg2-2.0.22-5.el7_5.ppc64le.rpm
gnupg2-debuginfo-2.0.22-5.el7_5.ppc64le.rpm

s390x:
gnupg2-2.0.22-5.el7_5.s390x.rpm
gnupg2-debuginfo-2.0.22-5.el7_5.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
gnupg2-debuginfo-2.0.22-5.el7_5.ppc64.rpm
gnupg2-smime-2.0.22-5.el7_5.ppc64.rpm

ppc64le:
gnupg2-debuginfo-2.0.22-5.el7_5.ppc64le.rpm
gnupg2-smime-2.0.22-5.el7_5.ppc64le.rpm

s390x:
gnupg2-debuginfo-2.0.22-5.el7_5.s390x.rpm
gnupg2-smime-2.0.22-5.el7_5.s390x.rpm

x86_64:
gnupg2-debuginfo-2.0.22-5.el7_5.x86_64.rpm
gnupg2-smime-2.0.22-5.el7_5.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):

aarch64:
gnupg2-debuginfo-2.0.22-5.el7_5.aarch64.rpm
gnupg2-smime-2.0.22-5.el7_5.aarch64.rpm

ppc64le:
gnupg2-debuginfo-2.0.22-5.el7_5.ppc64le.rpm
gnupg2-smime-2.0.22-5.el7_5.ppc64le.rpm

s390x:
gnupg2-debuginfo-2.0.22-5.el7_5.s390x.rpm
gnupg2-smime-2.0.22-5.el7_5.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
gnupg2-2.0.22-5.el7_5.src.rpm

x86_64:
gnupg2-2.0.22-5.el7_5.x86_64.rpm
gnupg2-debuginfo-2.0.22-5.el7_5.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
gnupg2-debuginfo-2.0.22-5.el7_5.x86_64.rpm
gnupg2-smime-2.0.22-5.el7_5.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2018-12020
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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