A vulnerability has been reported in PHP, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error within a hash generation function when hashing form posts and updating a hash table. This can be exploited to cause a hash collision resulting in high CPU consumption via a specially crafted form sent in a HTTP POST request.
The vulnerability is reported in version 5.3.8 and prior.
Solution: Update to version 5.3.9.
Provided and/or discovered by: Alexander Klink, n.runs AG and Julian Wälde, Technische Universität Darmstadt
Original Advisory: PHP:
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Subject: PHP Web Form Hash Collision Denial of Service Vulnerability
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