Apache Tomcat 7.x < 7.0.23 Hash Collision DoS

This script is Copyright (C) 2012-2016 Tenable Network Security, Inc.


Synopsis :

The remote web server is affected by a denial of service
vulnerability.

Description :

According to its self-reported version number, the instance of Apache
Tomcat 7.x listening on the remote host is prior to 7.0.23. It is,
therefore, affected by a denial of service vulnerability.

Large numbers of crafted form parameters can cause excessive CPU
consumption due to hash collisions.

Note that Nessus has not tested for this issue but has instead relied
only on the application's self-reported version number.

See also :

http://www.nessus.org/u?d97dc97c
http://www.nruns.com/_downloads/advisory28122011.pdf
http://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.23

Solution :

Upgrade to Apache Tomcat version 7.0.23 or later. Alternatively, as a
workaround, set the 'maxPostSize' configuration variable to the lowest
sensible value required to support your hosted applications.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.3
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Web Servers

Nessus Plugin ID: 57541 ()

Bugtraq ID: 51200
51447

CVE ID: CVE-2011-4858
CVE-2012-0022

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