ESB-2020.4320 – [Win][UNIX/Linux][Ubuntu] OpenSSL: Denial of service – Remote/unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.4320
                     USN-4662-1: OpenSSL vulnerability
                              9 December 2020

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

Product:           OpenSSL
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-1971  

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4662-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running OpenSSL check for an updated version of the software for 
         their operating system.

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USN-4662-1: OpenSSL vulnerability
08 December 2020

OpenSSL could be made to crash if it processed specially crafted input.
Releases

  o Ubuntu 20.10
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Packages

  o openssl - Secure Socket Layer (SSL) cryptographic library and tools
  o openssl1.0 - Secure Socket Layer (SSL) cryptographic library and tools

Details

David Benjamin discovered that OpenSSL incorrectly handled comparing
certificates containing a EDIPartyName name type. A remote attacker could
possibly use this issue to cause OpenSSL to crash, resulting in a denial of
service.

Update instructions

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

Ubuntu 20.10

  o libssl1.1 - 1.1.1f-1ubuntu4.1

Ubuntu 20.04

  o libssl1.1 - 1.1.1f-1ubuntu2.1

Ubuntu 18.04

  o libssl1.0.0 - 1.0.2n-1ubuntu5.5
  o libssl1.1 - 1.1.1-1ubuntu2.1~18.04.7

Ubuntu 16.04

  o libssl1.0.0 - 1.0.2g-1ubuntu4.18

After a standard system update you need to reboot your computer to make all
the necessary changes.

References

  o CVE-2020-1971

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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
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NOTE: This is only the original release of the security bulletin.  It may
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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