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Vulnerability Details : CVE-2011-4885 (2 public exploits)

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.
Publish Date : 2011-12-29 Last Update Date : 2018-01-08
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service

- Additional Vendor Supplied Data

Vendor Impact CVSS Score CVSS Vector Report Date Publish Date
Redhat moderate
AV:N/AC:L/Au:N/C:N/I:N/A:P 2011-11-01 2011-12-28
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- Related OVAL Definitions

Title Definition Id Class Family
DEPRECATED: ELSA-2012-0033 -- php security update (moderate) oval:org.mitre.oval:def:27656 unix
DEPRECATED: ELSA-2012-0019 -- php53 and php security update (moderate) oval:org.mitre.oval:def:27760 unix
DEPRECATED: ELSA-2012:0019: php53 and php security update (Moderate) oval:org.mitre.oval:def:23205 unix
DSA-2399-1 php5 -- several oval:org.mitre.oval:def:15401 unix
DSA-2399-2 php5 -- several oval:org.mitre.oval:def:14797 unix
ELSA-2012:0019: php53 and php security update (Moderate) oval:org.mitre.oval:def:23589 unix
ELSA-2012:0033: php security update (Moderate) oval:org.mitre.oval:def:23207 unix
HP-UX Apache Running Tomcat Servlet Engine, Remote Denial of Service (DoS), Access Restriction Bypass oval:org.mitre.oval:def:19791 unix
RHSA-2012:0019: php53 and php security update (Moderate) oval:com.redhat.rhsa:def:20120019 unix
RHSA-2012:0019: php53 and php security update (Moderate) oval:org.mitre.oval:def:21336 unix
RHSA-2012:0033: php security update (Moderate) oval:com.redhat.rhsa:def:20120033 unix
RHSA-2012:0033: php security update (Moderate) oval:org.mitre.oval:def:21346 unix
RHSA-2012:0071: php security update (Moderate) oval:com.redhat.rhsa:def:20120071 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2011-4885

# Product Type Vendor Product Version Update Edition Language
1 Application PHP PHP 5.0.0 RC3 Version Details Vulnerabilities
2 Application PHP PHP 5.0.0 Beta2 Version Details Vulnerabilities
3 Application PHP PHP 5.0.0 Beta3 Version Details Vulnerabilities
4 Application PHP PHP 5.0.0 Beta4 Version Details Vulnerabilities
5 Application PHP PHP 5.0.0 RC1 Version Details Vulnerabilities
6 Application PHP PHP 5.0.0 Version Details Vulnerabilities
7 Application PHP PHP 5.0.0 RC2 Version Details Vulnerabilities
8 Application PHP PHP 5.0.0 Beta1 Version Details Vulnerabilities
9 Application PHP PHP 5.0.1 Version Details Vulnerabilities
10 Application PHP PHP 5.0.2 Version Details Vulnerabilities
11 Application PHP PHP 5.0.3 Version Details Vulnerabilities
12 Application PHP PHP 5.0.4 Version Details Vulnerabilities
13 Application PHP PHP 5.0.5 Version Details Vulnerabilities
14 Application PHP PHP 5.1.1 Version Details Vulnerabilities
15 Application PHP PHP 5.1.2 Version Details Vulnerabilities
16 Application PHP PHP 5.1.3 Version Details Vulnerabilities
17 Application PHP PHP 5.1.4 Version Details Vulnerabilities
18 Application PHP PHP 5.1.5 Version Details Vulnerabilities
19 Application PHP PHP 5.1.6 Version Details Vulnerabilities
20 Application PHP PHP 5.2.0 Version Details Vulnerabilities
21 Application PHP PHP 5.2.1 Version Details Vulnerabilities
22 Application PHP PHP 5.2.2 Version Details Vulnerabilities
23 Application PHP PHP 5.2.3 Version Details Vulnerabilities
24 Application PHP PHP 5.2.4 Version Details Vulnerabilities
25 Application PHP PHP 5.2.5 Version Details Vulnerabilities
26 Application PHP PHP 5.2.6 Version Details Vulnerabilities
27 Application PHP PHP 5.2.7 Version Details Vulnerabilities
28 Application PHP PHP 5.2.8 Version Details Vulnerabilities
29 Application PHP PHP 5.2.9 Version Details Vulnerabilities
30 Application PHP PHP 5.2.10 Version Details Vulnerabilities
31 Application PHP PHP 5.2.11 Version Details Vulnerabilities
32 Application PHP PHP 5.2.12 Version Details Vulnerabilities
33 Application PHP PHP 5.2.14 Version Details Vulnerabilities
34 Application PHP PHP 5.2.15 Version Details Vulnerabilities
35 Application PHP PHP 5.2.16 Version Details Vulnerabilities
36 Application PHP PHP 5.2.17 Version Details Vulnerabilities
37 Application PHP PHP 5.3.0 Version Details Vulnerabilities
38 Application PHP PHP 5.3.1 Version Details Vulnerabilities
39 Application PHP PHP 5.3.2 Version Details Vulnerabilities
40 Application PHP PHP 5.3.3 Version Details Vulnerabilities
41 Application PHP PHP 5.3.4 Version Details Vulnerabilities
42 Application PHP PHP 5.3.5 Version Details Vulnerabilities
43 Application PHP PHP 5.3.6 Version Details Vulnerabilities
44 Application PHP PHP 5.3.7 Version Details Vulnerabilities
45 Application PHP PHP 5.3.8 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions

- References For CVE-2011-4885
XF php-hash-dos(72021)
SECTRACK 1026473
REDHAT RHSA-2012:0019
HP SSRT100826
EXPLOIT-DB 18296 PHP Hashtables Denial of Service Author:infodox Release Date:2012-01-01 (php) dos
EXPLOIT-DB 18305 PHP Hash Table Collision Proof Of Concept Author:Christian Mehlmauer Release Date:2012-01-03 (php) dos
CERT-VN VU#903934
BID 51193 PHP Web Form Hash Collision Denial Of Service Vulnerability Release Date:2014-11-14
SUSE openSUSE-SU-2012:0426
SUSE SUSE-SU-2012:0411
BUGTRAQ 20111228 n.runs-SA-2011.004 - web programming languages and platforms - DoS through hash table
APPLE APPLE-SA-2012-05-09-1

- Metasploit Modules Related To CVE-2011-4885

Hashtable Collisions
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.
Module type : auxiliary Rank : normal

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