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Ubuntu Security Notice USN-3675-3
June 18, 2018

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

- Ubuntu 12.04 ESM

Summary:

GnuPG could be made to incorrectly interpret the status of the
cryptographic operation if it received specially crafted file.

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

Details:

USN-3675-1 fixed a vulnerability in GnuPG. This update provides
the corresponding update for Ubuntu 12.04 ESM.

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. (CVE-2018-12020)

Update instructions:

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

Ubuntu 12.04 ESM:
  gnupg                           1.4.11-3ubuntu2.11

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

References:
  https://usn.ubuntu.com/usn/usn-3675-3
  https://usn.ubuntu.com/usn/usn-3675-1
  CVE-2018-12020