ESB-2018.1728.2 - UPDATE [Ubuntu] gnupg: Provide misleading information - Remote/unauthenticated 2018-06-15

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             AUSCERT External Security Bulletin Redistribution

                              ESB-2018.1728.2
                           GnuPG vulnerabilities
                               15 June 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           gnupg
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-12020 CVE-2018-9234 

Reference:         ESB-2018.1722

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3675-1
   http://www.ubuntu.com/usn/usn-3675-2

Comment: This bulletin contains two (2) Ubuntu security advisories.

Revision History:  June 15 2018: Updated for gnugpg2 for 16.04 and 14.04
                   June 12 2018: Initial Release

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==========================================================================
Ubuntu Security Notice USN-3675-1
June 11, 2018

gnupg, gnupg2 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- - Ubuntu 18.04 LTS
- - Ubuntu 17.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in GnuPG.

Software Description:
- - gnupg2: GNU privacy guard - a free PGP replacement
- - gnupg: GNU privacy guard - a free PGP replacement

Details:

Marcus Brinkmann discovered that during decryption or verification,
GnuPG did not properly filter out terminal sequences when reporting the
original filename. An attacker could use this to specially craft a file
that would cause an application parsing GnuPG output to incorrectly
interpret the status of the cryptographic operation reported by GnuPG.
(CVE-2018-12020)

Lance Vick discovered that GnuPG did not enforce configurations where
key certification required an offline master Certify key. An attacker
with access to a signing subkey could generate certifications that
appeared to be valid. This issue only affected Ubuntu 18.04 LTS.
(CVE-2018-9234)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
  gnupg                           2.2.4-1ubuntu1.1
  gpg                             2.2.4-1ubuntu1.1

Ubuntu 17.10:
  gnupg                           2.1.15-1ubuntu8.1

Ubuntu 16.04 LTS:
  gnupg                           1.4.20-1ubuntu3.2

Ubuntu 14.04 LTS:
  gnupg                           1.4.16-1ubuntu2.5

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3675-1
  CVE-2018-12020, CVE-2018-9234

Package Information:
  https://launchpad.net/ubuntu/+source/gnupg2/2.2.4-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/gnupg2/2.1.15-1ubuntu8.1
  https://launchpad.net/ubuntu/+source/gnupg/1.4.20-1ubuntu3.2
  https://launchpad.net/ubuntu/+source/gnupg/1.4.16-1ubuntu2.5

- --------------------------------------------------------------------------

==========================================================================
Ubuntu Security Notice USN-3675-2
June 15, 2018

gnupg2 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

GnuPG 2 could be made to present validity information incorrectly.

Software Description:
- - gnupg2: GNU privacy guard - a free PGP replacement

Details:

USN-3675-1 fixed a vulnerability in GnuPG 2 for Ubuntu 18.04 LTS and
Ubuntu 17.10. This update provides the corresponding update for GnuPG 2
in Ubuntu 16.04 LTS and Ubuntu 14.04 LTS.

Original advisory details:

 Marcus Brinkmann discovered that during decryption or verification,
 GnuPG did not properly filter out terminal sequences when reporting the
 original filename. An attacker could use this to specially craft a file
 that would cause an application parsing GnuPG output to incorrectly
 interpret the status of the cryptographic operation reported by GnuPG.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS:
  gnupg2                          2.1.11-6ubuntu2.1

Ubuntu 14.04 LTS:
  gnupg2                          2.0.22-3ubuntu1.4

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3675-2
  https://usn.ubuntu.com/usn/usn-3675-1
  CVE-2018-12020

Package Information:
  https://launchpad.net/ubuntu/+source/gnupg2/2.1.11-6ubuntu2.1
  https://launchpad.net/ubuntu/+source/gnupg2/2.0.22-3ubuntu1.4

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