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TITLE:
PHP "is_a()" Change in Functional Behaviour Security Issue

SECUNIA ADVISORY ID:
SA46107

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46107/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46107

RELEASE DATE:
2011-09-26

DISCUSS ADVISORY:
http://secunia.com/advisories/46107/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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http://secunia.com/advisories/46107/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=46107

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http://secunia.com/vulnerability_scanning/personal/
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DESCRIPTION:
A security issue has been reported in PHP, which potentially can be
exploited by malicious people to compromise a vulnerable system.

The security issue is caused due to a change in the behaviour of the
"is_a()" function when receiving strings as first argument, which can
lead to the "__autoload()" function being called unexpectedly. In
context of certain applications that rely on PHP's previous behaviour
and do not properly verify input in their "__autoload()" function,
this change can open up unexpected attack vectors, which can
potentially be exploited to e.g. execute arbitrary PHP code by
including arbitrary files from remote resources.

The security issue is reported in version 5.3.7 and 5.3.8. Other
versions may also be affected.

SOLUTION:
Fixed in the SVN repository.

PROVIDED AND/OR DISCOVERED BY:
Reported in a PHP bug by Mads, gartneriet.dk.

ORIGINAL ADVISORY:
https://bugs.php.net/bug.php?id=55475
http://www.byte.nl/blog/2011/09/23/security-bug-in-is_a-function-in-php-5-3-7-5-3-8/

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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