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Nagios NRPE 2.13 Code Execution

Nagios NRPE 2.13 Code Execution
Posted Feb 22, 2013
Authored by Rudolph Pereira | Site occamsec.com

Nagios NRPE versions 2.13 and below suffer from a remote command execution vulnerability.

tags | exploit, remote
advisories | CVE-2013-1362
MD5 | 4bb88c7ff6804d3843fb52e6d7d06bc9

Nagios NRPE 2.13 Code Execution

Change Mirror Download
Summary:
---------------
CVE-ID: CVE-2013-1362
CVSS: Base Score 7.5
CVSS2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P/E:U/RL:OF/RC:UC/CDP:N/TD:N/CR:L/IR:L/AR:L
Vendor: Nagios
Affected Products: NRPE
Affected Platforms: All
Affected versions: < 2.14
Remote Exploitable: Yes
Local Exploitable: No
Patch Status Vendor released a patch (See Solution)
URL: http://www.occamsec.com/vulnerabilities.html#nagios_metacharacter_vulnerability

Description
----------------
nrpe 2.13 has, in src/nrpc.c, line 52:

#define NASTY_METACHARS "|`&><'\"\\[]{};"

This allows the passing of $() to plugins/scripts which, if run under
bash, will execute that shell command under a subprocess and pass the
output as a parameter to the called script. Using this, it is possible
to get called scripts, such as check_http, to execute arbitrary
commands under the uid that NRPE/nagios is running as (typically,
'nagios').

Solution
------------
Upgrade to NRPE 2.14 or later, available at
http://sourceforge.net/projects/nagios/files/nrpe-2.x/

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