Deutsche Telekom CERT Advisory [DTC-A-20140324-004] nagios vulnerability

[<CERT@xxxxxxxxxx>]

Deutsche Telekom CERT Advisory [DTC-A-20140324-004]

Summary:
An Off-by-one memory access was found in the web gui of nagios.

A patch was applied to the core master branch of nagios 
(http://sourceforge.net/p/nagios/nagioscore/ci/d97e03f32741a7d851826b03ed73ff4c9612a866/).
This resolution is announced to be rolled into the 4.0.3 version of Nagios Core 
once testing has been completed.

There has been no feedback regarding the Version 3.5 branch of nagios, but the 
current sources seem to indicate that the issue was patched in version 3.5 as 
well. The issue should be fixed in the next release.

Homepage: http://www.nagios.org/

Recommendations:
Bug fixes in the source code available. Install updated packages as soon these 
packages are available. 

Details:
a) application
b) problem
c) CVSS
d) detailed description
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
a1) Nagios 3.5.0 [CVE-2013-7108]
b1) Off-by-one memory access
c1) 4.9 AV:N/AC:M/Au:S/C:P/I:N/A:P
d1) The icinga and nagios web gui are susceptible to an "off-by-one read" 
error, which is resulting from an improper assumption in the handling of user 
submitted CGI parameters. To prevent buffer overflow attacks against the web 
gui, icinga/nagios checks for valid string length of user submitted parameters. 
Any parameter, which is bigger than MAX_INPUT_BUFFER-1 characters long will be 
discarded. However, by sending a specially crafted cgi parameter, the check 
routine can be forced to skip the terminating null pointer and read the heap 
address right after the end of the parameter list. Depending on the memory 
layout, this may result in a memory corruption condition/crash or reading of 
sensitive memory locations.

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