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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3103
                     USN-4491-1: GnuTLS vulnerability
                             10 September 2020

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

Product:           GnuTLS
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-24659  

Original Bulletin: 
   https://usn.ubuntu.com/4491-1/

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

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USN-4491-1: GnuTLS vulnerability
09 September 2020

GnuTLS could be made to crash or run programs if it received specially
crafted network traffic.
Releases

  o Ubuntu 20.04 LTS

Packages

  o gnutls28 - GNU TLS library

Details

It was discovered that GnuTLS incorrectly handled certain alerts when being
used with TLS 1.3 servers. A remote attacker could use this issue to cause
GnuTLS to crash, resulting in a denial of service, or possibly execute
arbitrary code.

Update instructions

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

Ubuntu 20.04

  o libgnutls30 - 3.6.13-2ubuntu1.3

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

References

  o CVE-2020-24659

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