libxml_disable_entity_loader

(PHP 5 >= 5.2.11)

libxml_disable_entity_loader — Disable the ability to load external entities

说明

bool libxml_disable_entity_loader ([ bool $disable = true ] )

Disable/enable the ability to load external entities.

参数

disable: Disable (TRUE) or enable (FALSE) libxml extensions (such as DOM, XMLWriter and XMLReader) to load external entities.

返回值

Returns the previous value.

参见

libxml_use_internal_errors() - Disable libxml errors and allow user to fetch error information as needed
The LIBXML_NONET constant

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simonsimcity ¶

1 year 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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