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libxml_disable_entity_loader

(PHP 5 >= 5.2.11)

libxml_disable_entity_loaderDeshabilita la capacidad de cargar entidades externas

Descripción

bool libxml_disable_entity_loader ([ bool $disable = true ] )

Habilita/deshabilita la capacidad de cargar entidades externas.

Parámetros

disable

Deshabilita (TRUE) o habilita (FALSE) extensiones libxml (tal como DOM, XMLWriter y XMLReader) para cargar entidades externas.

Valores devueltos

Devuelve el valor anterior.

Ver también

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User Contributed Notes 4 notes

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2
simonsimcity
2 years ago
Using this function you can prevent a vulnerable to Local and Remote File Inclusion attacks.

You'll see it in an example where I load and validate the following string:

<!DOCTYPE scan [<!ENTITY test SYSTEM "php://filter/read=convert.base64-encode/resource=/etc/passwd">]>
<scan>&test;</scan>

One way to prevent that the file in given back is to set this value to 0.
Please take a closer look at the release of symfony 2.0.11
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2
daschtour at me dot com
8 months ago
This function was reported to be not thread safe. So this might affect php-scripts on the same server.
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1
phofstetter at sensational dot ch
7 months ago
Be mindful that this also disables url loading in simplexml_load_file() and likely other libxml based functions that deal with URLs
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0
brendan at bloodbone dot ws
5 months ago
This also seems to have an impact on <xsl:import /> statements if this is applied when loading XSLT for the XSLTProcessor class.
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