A new release of the Ubuntu Cloud Images for stable Ubuntu release 18.04 LTS (Bionic Beaver) is available at [1]. These new images superseded the existing images [2]. Images are available for download or immediate use on EC2 via publish AMI ids. Users who wish to update their existing installations can do so with:
   'sudo apt-get update && sudo apt-get dist-upgrade && sudo reboot'.

The following packages have been updated. Please see the full changelogs
for a complete listing of changes:
 * distro-info-data: 0.37ubuntu0.10 => 0.37ubuntu0.11 
 * openssl: 1.1.1-1ubuntu2.1~18.04.10 => 1.1.1-1ubuntu2.1~18.04.13 


The following is a complete changelog for this image.
new: {}
removed: {}
changed: ['distro-info-data', 'libssl1.1:amd64', 'openssl']
new snaps: {}
removed snaps: {}
changed snaps: []
==== distro-info-data: 0.37ubuntu0.10 => 0.37ubuntu0.11 ====
====     distro-info-data
  * Move Ubuntu EoLs off weekend days. (LP: #1939457)
==== openssl: 1.1.1-1ubuntu2.1~18.04.10 => 1.1.1-1ubuntu2.1~18.04.13 ====
====     libssl1.1:amd64 openssl
  * SECURITY UPDATE: SM2 Decryption Buffer Overflow
    - debian/patches/CVE-2021-3711-1.patch: correctly calculate the length
      of SM2 plaintext given the ciphertext in crypto/sm2/sm2_crypt.c,
      crypto/sm2/sm2_pmeth.c, crypto/include/internal/sm2.h,
      test/sm2_internal_test.c.
    - debian/patches/CVE-2021-3711-2.patch: extend tests for SM2 decryption
      in test/recipes/30-test_evp_data/evppkey.txt.
    - debian/patches/CVE-2021-3711-3.patch: check the plaintext buffer is
      large enough when decrypting SM2 in crypto/sm2/sm2_crypt.c.
    - CVE-2021-3711
  * SECURITY UPDATE: Read buffer overrun in X509_aux_print()
    - debian/patches/CVE-2021-3712.patch: fix a read buffer overrun in
      X509_aux_print() in crypto/x509/t_x509.c.
    - debian/patches/CVE-2021-3712-2.patch: fix i2v_GENERAL_NAME to not
      assume NUL terminated strings in crypto/x509v3/v3_alt.c,
      crypto/x509v3/v3_utl.c, crypto/include/internal/x509_int.h.
    - debian/patches/CVE-2021-3712-3.patch: fix POLICYINFO printing to not
      assume NUL terminated strings in crypto/x509v3/v3_cpols.c.
    - debian/patches/CVE-2021-3712-4.patch: fix printing of
      PROXY_CERT_INFO_EXTENSION to not assume NUL terminated strings in
      crypto/x509v3/v3_pci.c.
    - debian/patches/CVE-2021-3712-5.patch: fix the name constraints code
      to not assume NUL terminated strings in crypto/x509v3/v3_ncons.c.
    - debian/patches/CVE-2021-3712-6.patch: fix test code to not assume NUL
      terminated strings in test/x509_time_test.c.
    - debian/patches/CVE-2021-3712-7.patch: fix append_ia5 function to not
      assume NUL terminated strings in crypto/x509v3/v3_utl.c.
    - debian/patches/CVE-2021-3712-8.patch: fix NETSCAPE_SPKI_print
      function to not assume NUL terminated strings in
      crypto/asn1/t_spki.c.
    - debian/patches/CVE-2021-3712-9.patch: fix
      EC_GROUP_new_from_ecparameters to check the base length in
      crypto/ec/ec_asn1.c.
    - debian/patches/CVE-2021-3712-10.patch: allow fuzz builds to detect
      string overruns in crypto/asn1/asn1_lib.c.
    - debian/patches/CVE-2021-3712-11.patch: fix the error handling in
      i2v_AUTHORITY_KEYID in crypto/x509v3/v3_akey.c.
    - debian/patches/CVE-2021-3712-12.patch: allow fuzz builds to detect
      string overruns in crypto/asn1/asn1_lib.c.
    - debian/patches/CVE-2021-3712-13.patch: fix the name constraints code
      to not assume NUL terminated strings in crypto/x509v3/v3_ncons.c.
    - debian/patches/CVE-2021-3712-14.patch: fix i2v_GENERAL_NAME to not
      assume NUL terminated strings in crypto/x509v3/v3_utl.c.
    - CVE-2021-3712

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[1] http://cloud-images.ubuntu.com/releases/bionic/release-20210825/
[2] http://cloud-images.ubuntu.com/releases/bionic/release-20210817/