Operating System:

[Ubuntu]

Published:

23 January 2020

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.0238
                     USN-4246-1: zlib vulnerabilities
                              23 January 2020

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

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

Product:           zlib
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Denial of Service               -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-9843 CVE-2016-9842 CVE-2016-9841
                   CVE-2016-9840  

Original Bulletin: 
   https://usn.ubuntu.com/4246-1/

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USN-4246-1: zlib vulnerabilities
22 January 2020

zlib vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 16.04 LTS

Summary

Several security issues were fixed in zlib

Software Description

  o zlib - Lossless data-compression library

Details

It was discovered that zlib incorrectly handled pointer arithmetic. An attacker
could use this issue to cause zlib to crash, resulting in a denial of service,
or possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841)

It was discovered that zlib incorrectly handled vectors involving left shifts
of negative integers. An attacker could use this issue to cause zlib to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2016-9842)

It was discovered that zlib incorrectly handled vectors involving big-endian
CRC calculation. An attacker could use this issue to cause zlib to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2016-9843)

Update instructions

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

Ubuntu 16.04 LTS
    lib32z1 - 1:1.2.8.dfsg-2ubuntu4.3
    lib64z1 - 1:1.2.8.dfsg-2ubuntu4.3
    libn32z1 - 1:1.2.8.dfsg-2ubuntu4.3
    libx32z1 - 1:1.2.8.dfsg-2ubuntu4.3
    zlib1g - 1:1.2.8.dfsg-2ubuntu4.3

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

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

References

  o CVE-2016-9840
  o CVE-2016-9841
  o CVE-2016-9842
  o CVE-2016-9843

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