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             AUSCERT External Security Bulletin Redistribution

                      USN-5638-3: Expat vulnerability
                             24 November 2022


        AusCERT Security Bulletin Summary

Product:           Expat
Publisher:         Ubuntu
Operating System:  Ubuntu
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-43680  

Original Bulletin: 

Comment: CVSS (Max):  7.5 CVE-2022-43680 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
         CVSS Source: NVD
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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USN-5638-3: Expat vulnerability
23 November 2022

Expat could be made to crash or execute arbitrary code.

  o Ubuntu 22.10
  o Ubuntu 22.04 LTS
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 ESM


  o expat - XML parsing C library


USN-5638-1 fixed a vulnerability in Expat. This update provides
the corresponding updates for Ubuntu 16.04 ESM, Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 22.10. ( CVE-2022-43680 )
This update also fixes a minor regression introduced in
Ubuntu 18.04 LTS.

We apologize for the inconvenience.

Original advisory details:

Rhodri James discovered that Expat incorrectly handled memory when
processing certain malformed XML files. An attacker could possibly
use this issue to cause a crash or execute arbitrary code.

Update instructions

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

Ubuntu 22.10

  o expat - 2.4.8-2ubuntu0.22.10.1
  o libexpat1 - 2.4.8-2ubuntu0.22.10.1

Ubuntu 22.04

  o expat - 2.4.7-1ubuntu0.2
  o libexpat1 - 2.4.7-1ubuntu0.2

Ubuntu 20.04

  o expat - 2.2.9-1ubuntu0.6
  o libexpat1 - 2.2.9-1ubuntu0.6

Ubuntu 18.04

  o expat - 2.2.5-3ubuntu0.9
  o libexpat1 - 2.2.5-3ubuntu0.9

Ubuntu 16.04

  o expat - 2.1.0-7ubuntu0.16.04.5+esm7
    Available with Ubuntu Pro (Infra-only)
  o libexpat1 - 2.1.0-7ubuntu0.16.04.5+esm7
    Available with Ubuntu Pro (Infra-only)
  o lib64expat1 - 2.1.0-7ubuntu0.16.04.5+esm7
    Available with Ubuntu Pro (Infra-only)

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


  o CVE-2022-43680

Related notices

  o USN-5638-2 : libexpat1-dev, libexpat1, expat

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