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Revision:  375358
Date:      2014-12-23
Time:      21:24:55Z
Committer: rea

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VuXML IDDescription
edabe438-542f-11db-a5ae-00508d6a62dfphp -- open_basedir Race Condition Vulnerability

Stefan Esser reports:

PHP's open_basedir feature is meant to disallow scripts to access files outside a set of configured base directories. The checks for this are placed within PHP functions dealing with files before the actual open call is performed.

Obviously there is a little span of time between the check and the actual open call. During this time span the checked path could have been altered and point to a file that is forbidden to be accessed due to open_basedir restrictions.

Because the open_basedir restrictions often not call PHP functions but 3rd party library functions to actually open the file it is impossible to close this time span in a general way. It would only be possible to close it when PHP handles the actual opening on it's own.

While it seems hard to change the path during this little time span it is very simple with the use of the symlink() function combined with a little trick. PHP's symlink() function ensures that source and target of the symlink operation are allowed by open_basedir restrictions (and safe_mode). However it is possible to point a symlink to any file by the use of mkdir(), unlink() and at least two symlinks.


Discovery 2006-10-02
Entry 2006-10-05
Modified 2013-04-01
php4
php5
lt 4.4.4_1

ge 5 lt 5.1.6_2

php-suhosin
lt 0.9.6

php4-cli
php5-cli
php4-cgi
php5-cgi
php4-dtc
php5-dtc
php4-horde
php5-horde
php4-nms
php5-nms
mod_php4
mod_php5
ge 4 lt 4.4.4_1

ge 5 lt 5.1.6_2

20326
CVE-2006-5178
http://www.hardened-php.net/advisory_082006.132.html
http://secunia.com/advisories/22235/
edabe438-542f-11db-a5ae-00508d6a62dfphp -- open_basedir Race Condition Vulnerability

Stefan Esser reports:

PHP's open_basedir feature is meant to disallow scripts to access files outside a set of configured base directories. The checks for this are placed within PHP functions dealing with files before the actual open call is performed.

Obviously there is a little span of time between the check and the actual open call. During this time span the checked path could have been altered and point to a file that is forbidden to be accessed due to open_basedir restrictions.

Because the open_basedir restrictions often not call PHP functions but 3rd party library functions to actually open the file it is impossible to close this time span in a general way. It would only be possible to close it when PHP handles the actual opening on it's own.

While it seems hard to change the path during this little time span it is very simple with the use of the symlink() function combined with a little trick. PHP's symlink() function ensures that source and target of the symlink operation are allowed by open_basedir restrictions (and safe_mode). However it is possible to point a symlink to any file by the use of mkdir(), unlink() and at least two symlinks.


Discovery 2006-10-02
Entry 2006-10-05
Modified 2013-04-01
php4
php5
lt 4.4.4_1

ge 5 lt 5.1.6_2

php-suhosin
lt 0.9.6

php4-cli
php5-cli
php4-cgi
php5-cgi
php4-dtc
php5-dtc
php4-horde
php5-horde
php4-nms
php5-nms
mod_php4
mod_php5
ge 4 lt 4.4.4_1

ge 5 lt 5.1.6_2

20326
CVE-2006-5178
http://www.hardened-php.net/advisory_082006.132.html
http://secunia.com/advisories/22235/