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             AUSCERT External Security Bulletin Redistribution

                    USN-4971-1: libwebp vulnerabilities
                                2 June 2021


        AusCERT Security Bulletin Summary

Product:           libwebp
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-36332 CVE-2020-36331 CVE-2020-36330
                   CVE-2020-36329 CVE-2020-36328 CVE-2018-25014
                   CVE-2018-25013 CVE-2018-25012 CVE-2018-25011
                   CVE-2018-25010 CVE-2018-25009 

Original Bulletin: 

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

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USN-4971-1: libwebp vulnerabilities
01 June 2021

libwebp could be made to crash or run programs as your login if it
opened a specially crafted file.

  o Ubuntu 21.04
  o Ubuntu 20.10
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS


  o libwebp - Lossy compression of digital photographic images.


It was discovered that libwebp incorrectly handled certain malformed
images. If a user or automated system were tricked into opening a specially
crafted image file, a remote attacker could use this issue to cause libwebp
to crash, resulting in a denial of service, or possibly execute arbitrary

Update instructions

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

Ubuntu 21.04

  o libwebp6 - 0.6.1-2ubuntu0.21.04.1
  o libwebpmux3 - 0.6.1-2ubuntu0.21.04.1
  o libwebpdemux2 - 0.6.1-2ubuntu0.21.04.1

Ubuntu 20.10

  o libwebp6 - 0.6.1-2ubuntu0.20.10.1
  o libwebpmux3 - 0.6.1-2ubuntu0.20.10.1
  o libwebpdemux2 - 0.6.1-2ubuntu0.20.10.1

Ubuntu 20.04

  o libwebp6 - 0.6.1-2ubuntu0.20.04.1
  o libwebpmux3 - 0.6.1-2ubuntu0.20.04.1
  o libwebpdemux2 - 0.6.1-2ubuntu0.20.04.1

Ubuntu 18.04

  o libwebp6 - 0.6.1-2ubuntu0.18.04.1
  o libwebpmux3 - 0.6.1-2ubuntu0.18.04.1
  o libwebpdemux2 - 0.6.1-2ubuntu0.18.04.1

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


  o CVE-2020-36331
  o CVE-2018-25010
  o CVE-2018-25011
  o CVE-2020-36330
  o CVE-2020-36329
  o CVE-2018-25013
  o CVE-2018-25009
  o CVE-2020-36332
  o CVE-2020-36328
  o CVE-2018-25014
  o CVE-2018-25012

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