Vulnerability of LXML: Cross Site Scripting via Spaced URLs

Synthesis of the vulnerability

An attacker can trigger a Cross Site Scripting via Spaced URLs of LXML, in order to run JavaScript code in the context of the web site.

Impacted products: Debian, Fedora, Solaris, Ubuntu.

Severity of this bulletin: 2/4.

Creation date: 10/12/2018.

Références of this threat: bulletinjul2019, CVE-2018-19787, DLA-1604-1, FEDORA-2018-4be0428ab2, USN-3841-1, USN-3841-2, VIGILANCE-VUL-27987.

Description of the vulnerability

An attacker can trigger a Cross Site Scripting via Spaced URLs of LXML, in order to run JavaScript code in the context of the web site.
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This computer weakness alert impacts software or systems such as Debian, Fedora, Solaris, Ubuntu.

Our Vigil@nce team determined that the severity of this weakness note is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this weakness bulletin.

Solutions for this threat

Debian 8: new lxml packages.
New packages are available:
Debian 8: lxml 3.4.0-1+deb8u1

Fedora 29: new python-lxml packages.
New packages are available:
Fedora 29: python-lxml 4.2.5-1.fc29

Oracle Solaris: patch for third party software of July 2019 v1.
A patch is available:
https://support.oracle.com/rs?type=doc&id=1448883.1

Ubuntu: new lxml packages.
New packages are available:
  Ubuntu 12.04 ESM: python-lxml 2.3.2-1ubuntu0.3
  Ubuntu 18.04 LTS: python-lxml 4.2.1-1ubuntu0.1
  Ubuntu 16.04 LTS: python-lxml 3.5.0-1ubuntu0.1
  Ubuntu 14.04 LTS: python-lxml 3.3.3-1ubuntu0.2
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