Operating System:

[Ubuntu]

Published:

24 September 2021

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3209
                    USN-5088-1: EDK II vulnerabilities
                             24 September 2021

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

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

Product:           EDK II
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Create Arbitrary Files          -- Remote/Unauthenticated
                   Increased Privileges            -- Console/Physical      
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-38575 CVE-2021-23840 CVE-2021-3712
                   CVE-2019-11098  

Reference:         ESB-2021.3001
                   ESB-2021.2891
                   ESB-2021.2885

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5088-1

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USN-5088-1: EDK II vulnerabilities
23 September 2021

Several security issues were fixed in EDK II.
Releases

  o Ubuntu 21.04
  o Ubuntu 20.04 LTS

Packages

  o edk2 - UEFI firmware for virtual machines

Details

It was discovered that EDK II incorrectly handled input validation in
MdeModulePkg. A local user could possibly use this issue to cause EDK II to
crash, resulting in a denial of service, obtain sensitive information or
execute arbitrary code. ( CVE-2019-11098 )

Paul Kehrer discovered that OpenSSL used in EDK II incorrectly handled
certain input lengths in EVP functions. An attacker could possibly use this
issue to cause EDK II to crash, resulting in a denial of service.
( CVE-2021-23840 )

Ingo Schwarze discovered that OpenSSL used in EDK II incorrectly handled
certain ASN.1 strings. An attacker could use this issue to cause EDK II to
crash, resulting in a denial of service, or possibly obtain sensitive
information. ( CVE-2021-3712 )

It was discovered that EDK II incorrectly decoded certain strings. A remote
attacker could use this issue to cause EDK II to crash, resulting in a
denial of service, or possibly execute arbitrary code. ( CVE-2021-38575 )

Update instructions

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

Ubuntu 21.04

  o qemu-efi-arm - 2020.11-4ubuntu0.1
  o qemu-efi - 2020.11-4ubuntu0.1
  o ovmf-ia32 - 2020.11-4ubuntu0.1
  o qemu-efi-aarch64 - 2020.11-4ubuntu0.1
  o ovmf - 2020.11-4ubuntu0.1

Ubuntu 20.04

  o qemu-efi-arm - 0~20191122.bd85bf54-2ubuntu3.3
  o qemu-efi - 0~20191122.bd85bf54-2ubuntu3.3
  o qemu-efi-aarch64 - 0~20191122.bd85bf54-2ubuntu3.3
  o ovmf - 0~20191122.bd85bf54-2ubuntu3.3

After a standard system update you need to restart the virtual machines
that use the affected firmware to make all the necessary changes.

References

  o CVE-2019-11098
  o CVE-2021-3712
  o CVE-2021-23840
  o CVE-2021-38575

Related notices

  o USN-5051-1 : libssl-doc, libssl-dev, libssl1.1, openssl
  o USN-5051-2 : libssl-doc, libssl1.0.0, libssl-dev, openssl
  o USN-5051-3 : libssl1.0.0, openssl1.0, libssl1.0-dev
  o USN-4738-1 : libssl-doc, libssl1.0.0, libssl1.1, libcrypto1.1-udeb,
    libssl1.0-dev, libcrypto1.0.0-udeb, libssl-dev, libssl1.1-udeb,
    libssl1.0.0-udeb, openssl1.0, openssl

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