Web sites must limit the number of simultaneous requests.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-2240	WG110 IIS7	SV-32323r2_rule	ECSC-1	Medium

Description
Resource exhaustion can occur when an unlimited number of concurrent requests are allowed on a web-site, facilitating a Denial of Service attack. Mitigating this kind of attack will include limiting the number of concurrent HTTP/HTTPS requests per IP address and may include, where feasible, limiting parameter values associated with keepalive (i.e., a parameter used to limit the amount of time a connection may be inactive).

Description

Resource exhaustion can occur when an unlimited number of concurrent requests are allowed on a web-site, facilitating a Denial of Service attack. Mitigating this kind of attack will include limiting the number of concurrent HTTP/HTTPS requests per IP address and may include, where feasible, limiting parameter values associated with keepalive (i.e., a parameter used to limit the amount of time a connection may be inactive).

STIG	Date
IIS 7.0 WEB SITE STIG	2014-12-05

Details

Check Text ( C-32730r3_chk )
1. Open an administrator command prompt. 2. CD \Windows\system32\inetserv 3. Enter the command: appcmd list config /section:system.applicationHost/sites>out.txt (opens output in Notepad). 4. Review the results and verify each web site has a value greater than zero listed for maxconnections parameter. If not, this is a finding. If nothing is listed, this is also a finding.

Fix Text (F-29195r4_fix)
For the site under review, determine the maximum number of connections needed. 1. Open an administrator command prompt. 2. CD \Windows\system32\inetserv 3. Enter the command: appcmd set config /section:system.applicationHost/sites "/[name='SITENAME'].limits. maxConnections:X" /commit:apphost Note: Replace SITENAME with the site under review and X with the maximum number of connections allowable. 5. Enter the command to verify changes: appcmd list config –section:system.applicationHost/sites>out.txt (opens output in Notepad).

Fix Text (F-29195r4_fix)

For the site under review, determine the maximum number of connections needed.

1. Open an administrator command prompt.
2. CD \Windows\system32\inetserv
3. Enter the command:
appcmd set config /section:system.applicationHost/sites "/[name='SITENAME'].limits. maxConnections:X" /commit:apphost

Note: Replace SITENAME with the site under review and X with the maximum number of connections allowable.

5. Enter the command to verify changes:
appcmd list config –section:system.applicationHost/sites>out.txt (opens output in Notepad).