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AUSCERT External Security Bulletin Redistribution
ESB-2019.2316
USN-4040-1: Expat vulnerability and USN-4040-2: Expat vulnerability
27 June 2019
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AusCERT Security Bulletin Summary
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Product: Expat
Publisher: Ubuntu
Operating System: Ubuntu
Linux variants
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-20843
Original Bulletin:
https://usn.ubuntu.com/4040-1/
https://usn.ubuntu.com/4040-2/
Comment: This bulletin contains two (2) Ubuntu security advisories.
This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running Expat check for an updated version of the software for their
operating system.
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USN-4040-1: Expat vulnerability
26 June 2019
expat vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.04
o Ubuntu 18.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
Expat could be made to consume a high amount of RAM and CPU resources if it
received a specially crafted XML file.
Software Description
o expat - XML parsing C library
Details
It was discovered that Expat incorrectly handled certain XML files. An attacker
could possibly use this issue to cause a denial of service.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 19.04
libexpat1 - 2.2.6-1ubuntu0.19.04
Ubuntu 18.10
libexpat1 - 2.2.6-1ubuntu0.18.10
Ubuntu 18.04 LTS
libexpat1 - 2.2.5-3ubuntu0.1
Ubuntu 16.04 LTS
lib64expat1 - 2.1.0-7ubuntu0.16.04.4
libexpat1 - 2.1.0-7ubuntu0.16.04.4
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-2018-20843
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USN-4040-2: Expat vulnerability
26 June 2019
expat vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 14.04 ESM
o Ubuntu 12.04 ESM
Summary
Expat could be made to consume a high amount of RAM and CPU resources if it
received a specially crafted XML file.
Software Description
o expat - XML parsing C library
Details
USN-4040-1 fixed a vulnerability in expat. This update provides the
corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
Original advisory details:
It was discovered that Expat incorrectly handled certain XML files. An attacker
could possibly use this issue to cause a denial of service.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 14.04 ESM
lib64expat1 - 2.1.0-4ubuntu1.4+esm1
libexpat1 - 2.1.0-4ubuntu1.4+esm1
Ubuntu 12.04 ESM
lib64expat1 - 2.0.1-7.2ubuntu1.6
libexpat1 - 2.0.1-7.2ubuntu1.6
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 USN-4040-1
o CVE-2018-20843
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