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Ubuntu Security Notice USN-5503-1

Ubuntu Security Notice 5503-1 - Demi Marie Obenour discovered that GnuPG incorrectly handled injection in the status message. A remote attacker could possibly use this issue to forge signatures.

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#vulnerability#ubuntu

==========================================================================
Ubuntu Security Notice USN-5503-1
July 05, 2022

gnupg2 vulnerability

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

  • Ubuntu 22.04 LTS
  • Ubuntu 21.10
  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 LTS

Summary:

GnuPG could allow forged signatures.

Software Description:

  • gnupg2: GNU privacy guard - a free PGP replacement

Details:

Demi Marie Obenour discovered that GnuPG incorrectly handled injection in
the status message. A remote attacker could possibly use this issue to
forge signatures.

Update instructions:

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

Ubuntu 22.04 LTS:
gnupg 2.2.27-3ubuntu2.1
gnupg2 2.2.27-3ubuntu2.1
gpg 2.2.27-3ubuntu2.1

Ubuntu 21.10:
gnupg 2.2.20-1ubuntu4.1
gnupg2 2.2.20-1ubuntu4.1
gpg 2.2.20-1ubuntu4.1

Ubuntu 20.04 LTS:
gnupg 2.2.19-3ubuntu2.2
gnupg2 2.2.19-3ubuntu2.2
gpg 2.2.19-3ubuntu2.2

Ubuntu 18.04 LTS:
gnupg 2.2.4-1ubuntu1.6
gnupg2 2.2.4-1ubuntu1.6
gpg 2.2.4-1ubuntu1.6

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

References:
https://ubuntu.com/security/notices/USN-5503-1
CVE-2022-34903

Package Information:
https://launchpad.net/ubuntu/+source/gnupg2/2.2.27-3ubuntu2.1
https://launchpad.net/ubuntu/+source/gnupg2/2.2.20-1ubuntu4.1
https://launchpad.net/ubuntu/+source/gnupg2/2.2.19-3ubuntu2.2
https://launchpad.net/ubuntu/+source/gnupg2/2.2.4-1ubuntu1.6

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Ubuntu Security Notice USN-5503-2

Ubuntu Security Notice 5503-2 - USN-5503-1 fixed a vulnerability in GnuPG. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. Demi Marie Obenour discovered that GnuPG incorrectly handled injection in the status message. A remote attacker could possibly use this issue to forge signatures.

CVE-2022-34903: ⚓ T6027 Revisit write_status_text_and buffer

GnuPG through 2.3.6, in unusual situations where an attacker possesses any secret-key information from a victim's keyring and other constraints (e.g., use of GPGME) are met, allows signature forgery via injection into the status line.

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