libx11: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3066
                    USN-4487-2: libx11 vulnerabilities
                             9 September 2020

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        AusCERT Security Bulletin Summary
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Product:           libx11
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Increased Privileges            -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-14363 CVE-2020-14344 

Reference:         ESB-2020.3019

Original Bulletin: 
   https://usn.ubuntu.com/4487-2/

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USN-4487-2: libx11 vulnerabilities
08 September 2020

Several security issues were fixed in libx11.
Releases

  o Ubuntu 14.04 ESM
  o Ubuntu 12.04 ESM

Packages

  o libx11 - None

Details

USN-4487-1 fixed several vulnerabilities in libx11. This update provides
the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM.

Original advisory details:

Todd Carson discovered that libx11 incorrectly handled certain memory
operations. A local attacker could possibly use this issue to escalate
privileges. (CVE-2020-14344)

Jayden Rivers discovered that libx11 incorrectly handled locales. A local
attacker could possibly use this issue to escalate privileges.
(CVE-2020-14363)

Update instructions

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

Ubuntu 14.04

  o libx11-6 - 2:1.6.2-1ubuntu2.1+esm1

Ubuntu 12.04

  o libx11-6 - 2:1.4.99.1-0ubuntu2.5

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

References

  o CVE-2020-14344
  o CVE-2020-14363

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