Dear Martin,you were already told in November that the bugs you reported were known and fixed over 3 month ago in the PHP-CVS.
From your advisory it is obvious that you have not analysed the vulnerability you describe at all:
This example clearly shows that you have no clue about what is going on. The bug in the unserializer is, that it tries to copy the next 9999999 Bytes (starting with the 'A') into a properly allocated memory block. Unfourtunately this will crash because it will try to read unpaged memory areas. There is no bufferoverflow and no memory corruption in your example.1) Memory Corruption / buffer overflow ====================================== DESCRIPTION: Insufficient input validation of serialized strings lead to memory corruption and information disclosre. EXAMPLE script - "Segfault": ---cut here--- <? $s = 's:9999999:"A";"'; $a = unserialize($s); print $a; ?> ---cut here---
REMARKS: leads to arbitrary code execution and file/information disclosure.
How does reading unpaged memory lead to arbitrary code execution?
Hardened-PHP has released an advisory about bugs in unserialize(). But the reported vulnerabilities are totally different from the stuff "you have found". The Hardened-PHP advisory does NOT cover the unserialize() vulnerabilities fixed about 3 month ago by Markus Boerger, because they were NOT found by me. And yeah some of the bugs Marcus fixed can lead to arbitrary code execution. (But the exploit will be a lot more unstable than an exploit for my buf [07])========================================================================================================================= FOR SOME STRANGE REASONS HARDENED-PHP.NET HAS RELEASED THIS ADVISORY TODAY TOGETHER WITH A BUNCH OF OTHER VULNERABILITIES ==========================================================================================================================
Greetings Stefan Esser