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Vulnerability Details : CVE-2011-4885

PHP before 5.3.9 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.
Vulnerability category: Input validationDenial of service
Published 2011-12-30 01:55:02
Updated 2018-01-09 02:29:01
Source MITRE
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2011-4885

Probability of exploitation activity in the next 30 days: 87.47%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 98 % EPSS Score History EPSS FAQ

Metasploit modules for CVE-2011-4885

  • Hashtable Collisions
    Disclosure Date : 2011-12-28
    auxiliary/dos/http/hashcollision_dos
    This module uses a denial-of-service (DoS) condition appearing in a variety of programming languages. This vulnerability occurs when storing multiple values in a hash table and all values have the same hash value. This can cause a web server parsing the POST parameters issued with a request into a hash table to consume hours of CPU with a single HTTP request. Currently, only the hash functions for PHP and Java are implemented. This module was tested with PHP + httpd, Tomcat, Glassfish and Geronimo. It also generates a random payload to bypass some IDS signatures. Authors: - Alexander Klink - Julian Waelde - Scott A. Crosby - Dan S. Wallach - Krzysztof Kotowicz - Christian Mehlmauer <[email protected]>

CVSS scores for CVE-2011-4885

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
5.0
 MEDIUM AV:N/AC:L/Au:N/C:N/I:N/A:P
10.0
2.9
 [email protected]

CWE ids for CVE-2011-4885

  • The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
    Assigned by: [email protected] (Primary)

References for CVE-2011-4885

Products affected by CVE-2011-4885

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