Ubuntu Security Notice 3356-1 - It was discovered that Expat incorrectly handled certain external entities. A remote attacker could possibly use this issue to cause Expat to hang, resulting in a denial of service.
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Ubuntu Security Notice USN-3356-1
July 19, 2017
expat vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 17.04
- Ubuntu 16.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary:
Expat could be made to hang if it received specially crafted input.
Software Description:
- expat: XML parsing C library
Details:
It was discovered that Expat incorrectly handled certain external entities.
A remote attacker could possibly use this issue to cause Expat to hang,
resulting in a denial of service.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 17.04:
lib64expat1 2.2.0-2ubuntu0.1
libexpat1 2.2.0-2ubuntu0.1
Ubuntu 16.10:
lib64expat1 2.2.0-1ubuntu0.1
libexpat1 2.2.0-1ubuntu0.1
Ubuntu 16.04 LTS:
lib64expat1 2.1.0-7ubuntu0.16.04.3
libexpat1 2.1.0-7ubuntu0.16.04.3
Ubuntu 14.04 LTS:
lib64expat1 2.1.0-4ubuntu1.4
libexpat1 2.1.0-4ubuntu1.4
In general, a standard system update will make all the necessary changes.
References:
https://www.ubuntu.com/usn/usn-3356-1
CVE-2017-9233
Package Information:
https://launchpad.net/ubuntu/+source/expat/2.2.0-2ubuntu0.1
https://launchpad.net/ubuntu/+source/expat/2.2.0-1ubuntu0.1
https://launchpad.net/ubuntu/+source/expat/2.1.0-7ubuntu0.16.04.3
https://launchpad.net/ubuntu/+source/expat/2.1.0-4ubuntu1.4