Advisory Published

USN-3504-1: libxml2 vulnerability

First published: Tue Dec 05 2017(Updated: )

Wei Lei discovered that libxml2 incorrecty handled certain parameter entities. An attacker could use this issue with specially constructed XML data to cause libxml2 to consume resources, leading to a denial of service.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libxml2<2.9.4+dfsg1-4ubuntu1.1
2.9.4+dfsg1-4ubuntu1.1
=17.10
All of
ubuntu/libxml2-utils<2.9.4+dfsg1-4ubuntu1.1
2.9.4+dfsg1-4ubuntu1.1
=17.10
All of
ubuntu/python-libxml2<2.9.4+dfsg1-4ubuntu1.1
2.9.4+dfsg1-4ubuntu1.1
=17.10
All of
ubuntu/python3-libxml2<2.9.4+dfsg1-4ubuntu1.1
2.9.4+dfsg1-4ubuntu1.1
=17.10
All of
ubuntu/libxml2<2.9.4+dfsg1-2.2ubuntu0.2
2.9.4+dfsg1-2.2ubuntu0.2
=17.04
All of
ubuntu/libxml2-utils<2.9.4+dfsg1-2.2ubuntu0.2
2.9.4+dfsg1-2.2ubuntu0.2
=17.04
All of
ubuntu/python-libxml2<2.9.4+dfsg1-2.2ubuntu0.2
2.9.4+dfsg1-2.2ubuntu0.2
=17.04
All of
ubuntu/python3-libxml2<2.9.4+dfsg1-2.2ubuntu0.2
2.9.4+dfsg1-2.2ubuntu0.2
=17.04
All of
ubuntu/libxml2<2.9.3+dfsg1-1ubuntu0.4
2.9.3+dfsg1-1ubuntu0.4
=16.04
All of
ubuntu/libxml2-utils<2.9.3+dfsg1-1ubuntu0.4
2.9.3+dfsg1-1ubuntu0.4
=16.04
All of
ubuntu/python-libxml2<2.9.3+dfsg1-1ubuntu0.4
2.9.3+dfsg1-1ubuntu0.4
=16.04
All of
ubuntu/libxml2<2.9.1+dfsg1-3ubuntu4.11
2.9.1+dfsg1-3ubuntu4.11
=14.04
All of
ubuntu/libxml2-utils<2.9.1+dfsg1-3ubuntu4.11
2.9.1+dfsg1-3ubuntu4.11
=14.04
All of
ubuntu/python-libxml2<2.9.1+dfsg1-3ubuntu4.11
2.9.1+dfsg1-3ubuntu4.11
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability in USN-3504-1?

    USN-3504-1 is a vulnerability in libxml2 that allows an attacker to consume resources and cause a denial of service through specially constructed XML data.

  • Which versions of libxml2 are affected by USN-3504-1?

    Versions 2.9.4+dfsg1-4ubuntu1.1, 2.9.4+dfsg1-2.2ubuntu0.2, 2.9.3+dfsg1-1ubuntu0.4, and 2.9.1+dfsg1-3ubuntu4.11 of libxml2 are affected by USN-3504-1.

  • How can an attacker exploit USN-3504-1?

    An attacker can exploit USN-3504-1 by sending specially crafted XML data to the vulnerable system.

  • What is the remedy for USN-3504-1?

    The remedy for USN-3504-1 is to update libxml2 to version 2.9.4+dfsg1-4ubuntu1.1 or later.

  • Where can I find more information about USN-3504-1?

    You can find more information about USN-3504-1 at the following references: [link1] [link2] [link3].

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