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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3134
                   USN-5080-2: Libgcrypt vulnerabilities
                             17 September 2021

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

Product:           Libgcrypt
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-40528 CVE-2021-33560 

Reference:         ESB-2021.2242
                   ESB-2021.2234
                   ESB-2021.2188

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5080-2
   https://ubuntu.com/security/notices/USN-5080-1

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

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-5080-2: Libgcrypt vulnerabilities
16 September 2021

Libgcrypt could be made to expose sensitive information.
Releases

  o Ubuntu 16.04 ESM

Packages

  o libgcrypt20 - LGPL Crypto library

Details

USN-5080-1 fixed several vulnerabilities in Libgcrypt. This update provides
the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

It was discovered that Libgcrypt incorrectly handled ElGamal encryption. An
attacker could possibly use this issue to recover sensitive information.

Update instructions

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

Ubuntu 16.04

  o libgcrypt20 - 1.6.5-2ubuntu0.6+esm1
    Available with UA Infra or UA Desktop

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

References

  o CVE-2021-33560
  o CVE-2021-40528

Related notices

  o USN-5080-1 : libgcrypt-mingw-w64-dev, libgcrypt20-doc, libgcrypt11-dev,
    libgcrypt20-dev, libgcrypt20


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

USN-5080-1: Libgcrypt vulnerabilities
16 September 2021

Libgcrypt could be made to expose sensitive information.
Releases

  o Ubuntu 21.04
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS

Packages

  o libgcrypt20 - LGPL Crypto library

Details

It was discovered that Libgcrypt incorrectly handled ElGamal encryption. An
attacker could possibly use this issue to recover sensitive information.

Update instructions

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

Ubuntu 21.04

  o libgcrypt20 - 1.8.7-2ubuntu2.1

Ubuntu 20.04

  o libgcrypt20 - 1.8.5-5ubuntu1.1

Ubuntu 18.04

  o libgcrypt20 - 1.8.1-4ubuntu1.3

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

References

  o CVE-2021-33560
  o CVE-2021-40528

Related notices

  o USN-5080-2 : libgcrypt20-doc, libgcrypt11-dev, libgcrypt20, libgcrypt20-dev

- --------------------------END INCLUDED TEXT--------------------

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