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Vulnerability Details : CVE-2011-4858

Apache Tomcat before 5.5.35, 6.x before 6.0.35, and 7.x before 7.0.23 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 : 2012-01-05 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
CWE ID 399

- 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
CVE-2011-4858 unix
DEPRECATED: ELSA-2012-0474 -- tomcat5 security update (moderate) oval:org.mitre.oval:def:27313 unix
DEPRECATED: ELSA-2012-0475 -- tomcat6 security update (moderate) oval:org.mitre.oval:def:27374 unix
DSA-2401-1 tomcat6 -- several oval:org.mitre.oval:def:15309 unix
ELSA-2012:0474: tomcat5 security update (Moderate) oval:org.mitre.oval:def:23331 unix
ELSA-2012:0475: tomcat6 security update (Moderate) oval:org.mitre.oval:def:23745 unix
HP-UX Apache Running Tomcat Servlet Engine, Remote Denial of Service (DoS), Access Restriction Bypass, Unauthorized Mod... oval:org.mitre.oval:def:18886 unix
RHSA-2012:0474: tomcat5 security update (Moderate) oval:org.mitre.oval:def:21412 unix
RHSA-2012:0474: tomcat5 security update (Moderate) oval:com.redhat.rhsa:def:20120474 unix
RHSA-2012:0475: tomcat6 security update (Moderate) oval:org.mitre.oval:def:21312 unix
RHSA-2012:0475: tomcat6 security update (Moderate) oval:com.redhat.rhsa:def:20120475 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-2011-4858

# Product Type Vendor Product Version Update Edition Language
1 Application Apache Tomcat 5.5.35 Version Details Vulnerabilities
2 Application Apache Tomcat 6.0.0 Version Details Vulnerabilities
3 Application Apache Tomcat 6.0.1 Version Details Vulnerabilities
4 Application Apache Tomcat 6.0.2 Version Details Vulnerabilities
5 Application Apache Tomcat 6.0.3 Version Details Vulnerabilities
6 Application Apache Tomcat 6.0.4 Version Details Vulnerabilities
7 Application Apache Tomcat 6.0.5 Version Details Vulnerabilities
8 Application Apache Tomcat 6.0.6 Version Details Vulnerabilities
9 Application Apache Tomcat 6.0.7 Version Details Vulnerabilities
10 Application Apache Tomcat 6.0.8 Version Details Vulnerabilities
11 Application Apache Tomcat 6.0.9 Version Details Vulnerabilities
12 Application Apache Tomcat 6.0.10 Version Details Vulnerabilities
13 Application Apache Tomcat 6.0.11 Version Details Vulnerabilities
14 Application Apache Tomcat 6.0.12 Version Details Vulnerabilities
15 Application Apache Tomcat 6.0.13 Version Details Vulnerabilities
16 Application Apache Tomcat 6.0.14 Version Details Vulnerabilities
17 Application Apache Tomcat 6.0.15 Version Details Vulnerabilities
18 Application Apache Tomcat 6.0.16 Version Details Vulnerabilities
19 Application Apache Tomcat 6.0.17 Version Details Vulnerabilities
20 Application Apache Tomcat 6.0.18 Version Details Vulnerabilities
21 Application Apache Tomcat 6.0.19 Version Details Vulnerabilities
22 Application Apache Tomcat 6.0.20 Version Details Vulnerabilities
23 Application Apache Tomcat 6.0.21 Version Details Vulnerabilities
24 Application Apache Tomcat 6.0.22 Version Details Vulnerabilities
25 Application Apache Tomcat 6.0.23 Version Details Vulnerabilities
26 Application Apache Tomcat 6.0.24 Version Details Vulnerabilities
27 Application Apache Tomcat 6.0.25 Version Details Vulnerabilities
28 Application Apache Tomcat 6.0.26 Version Details Vulnerabilities
29 Application Apache Tomcat 6.0.27 Version Details Vulnerabilities
30 Application Apache Tomcat 6.0.28 Version Details Vulnerabilities
31 Application Apache Tomcat 6.0.29 Version Details Vulnerabilities
32 Application Apache Tomcat 6.0.30 Version Details Vulnerabilities
33 Application Apache Tomcat 6.0.31 Version Details Vulnerabilities
34 Application Apache Tomcat 6.0.32 Version Details Vulnerabilities
35 Application Apache Tomcat 6.0.33 Version Details Vulnerabilities
36 Application Apache Tomcat 6.0.34 Version Details Vulnerabilities
37 Application Apache Tomcat 7.0.0 Version Details Vulnerabilities
38 Application Apache Tomcat 7.0.1 Version Details Vulnerabilities
39 Application Apache Tomcat 7.0.2 Version Details Vulnerabilities
40 Application Apache Tomcat 7.0.3 Version Details Vulnerabilities
41 Application Apache Tomcat 7.0.4 Version Details Vulnerabilities
42 Application Apache Tomcat 7.0.5 Version Details Vulnerabilities
43 Application Apache Tomcat 7.0.6 Version Details Vulnerabilities
44 Application Apache Tomcat 7.0.7 Version Details Vulnerabilities
45 Application Apache Tomcat 7.0.8 Version Details Vulnerabilities
46 Application Apache Tomcat 7.0.9 Version Details Vulnerabilities
47 Application Apache Tomcat 7.0.10 Version Details Vulnerabilities
48 Application Apache Tomcat 7.0.11 Version Details Vulnerabilities
49 Application Apache Tomcat 7.0.12 Version Details Vulnerabilities
50 Application Apache Tomcat 7.0.13 Version Details Vulnerabilities
51 Application Apache Tomcat 7.0.14 Version Details Vulnerabilities
52 Application Apache Tomcat 7.0.15 Version Details Vulnerabilities
53 Application Apache Tomcat 7.0.16 Version Details Vulnerabilities
54 Application Apache Tomcat 7.0.17 Version Details Vulnerabilities
55 Application Apache Tomcat 7.0.18 Version Details Vulnerabilities
56 Application Apache Tomcat 7.0.19 Version Details Vulnerabilities
57 Application Apache Tomcat 7.0.20 Version Details Vulnerabilities
58 Application Apache Tomcat 7.0.21 Version Details Vulnerabilities
59 Application Apache Tomcat 7.0.22 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Apache Tomcat 59

- References For CVE-2011-4858
BID 51200 Apache Tomcat Hash Collision Denial Of Service Vulnerability Release Date:2014-06-09 CONFIRM
REDHAT RHSA-2012:0325
REDHAT RHSA-2012:0075
REDHAT RHSA-2012:0076
REDHAT RHSA-2012:0089[email protected]%3e
MLIST [announce] 20111228 [SECURITY] Apache Tomcat and the hashtable collision DoS vulnerability
REDHAT RHSA-2012:0078
REDHAT RHSA-2012:0077
REDHAT RHSA-2012:0406
REDHAT RHSA-2012:0074
CERT-VN VU#903934

- Metasploit Modules Related To CVE-2011-4858

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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