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Vulnerability of expat: denial of service via entities

Synthesis of the vulnerability 

An attacker can transmit malicious XML data to an application linked to expat, in order to force it to allocate large memory resources.
Vulnerable products: Domino by IBM, Notes by IBM, Slackware, Unix (platform) ~ not comprehensive.
Severity of this weakness: 2/4.
Creation date: 22/02/2013.
Références of this bulletin: BID-58233, CVE-2013-0340, SSA:2021-143-01, swg22010778, VIGILANCE-VUL-12450.

Description of the vulnerability 

The expat library processes XML data.

An XML entity (such as "&abc;") is used to define an alias of a text string.

However, if the same large entity is called several thousand times in an XML document, the library consumes numerous resources to store the XML tree.

An attacker can therefore transmit malicious XML data to an application linked to expat, in order to force it to allocate large memory resources.
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This threat alert impacts software or systems such as Domino by IBM, Notes by IBM, Slackware, Unix (platform) ~ not comprehensive.

Our Vigil@nce team determined that the severity of this computer vulnerability bulletin is medium.

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

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this weakness note.

Solutions for this threat 

IBM Domino/Notes: fixed versions for Expat.
Fixed versions are indicated in information sources.

Slackware: new expat packages.
New packages are available:
  Slackware 14.0: expat 2.4.1-*-1_slack14.0
  Slackware 14.1: expat 2.4.1-*-1_slack14.1
  Slackware 14.2: expat 2.4.1-*-1_slack14.2
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