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TITLE:
ZABBIX "vfs.file.cksum" Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA29383

VERIFY ADVISORY:
http://secunia.com/advisories/29383/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
ZABBIX 1.x
http://secunia.com/product/12242/

DESCRIPTION:
Milen Rangelov has discovered a vulnerability in ZABBIX, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to the improper implementation of the
"vfs.file.cksum" command in "zabbix_agentd". This can be exploited to
disable the processing of valid requests via multiple
"vfs.file.cksum" commands, having e.g. "/dev/urandom" as a parameter,
sent to the port on which "zabbix_agentd" is listening (port 10050/TCP
by default).

Successful exploitation requires that the malicious requests are sent
from an authorized host.

The vulnerability is confirmed in version 1.4.4. Other versions may
also be affected.

SOLUTION:
Restrict access to trusted hosts only.

PROVIDED AND/OR DISCOVERED BY:
Milen Rangelov

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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