zabbix_agentd in Zabbix before 1.8.6 and 1.9.x before 1.9.4 allows context-dependent attackers to cause a denial of service (CPU consumption) by executing the vfs.file.cksum command for a special device, as demonstrated by the /dev/urandom device.

According to its self-reported version number, the instance of Zabbix listening on the remote host is 1.9.x prior to 1.9.4.  It could, therefore, be affected by a denial of service vulnerability related to 'zabbix_agentd' and 'vfs.file.cksum'.  An attacker can cause excessive CPU usage if the 'vfs.file.cksum' command is pointed at a special device such as '/dev/urandom'. 

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

The remote host is affected by the vulnerability described in GLSA-201311-15 (Zabbix: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Zabbix. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker may be able to execute arbitrary SQL statements, cause       a Denial of Service condition, or obtain sensitive information.
  Workaround :

    There is no known workaround at this time.

According to its self-reported version number, the instance of Zabbix listening on the remote host is earlier than 1.8.6.  It could, therefore, be affected by multiple vulnerabilities. 

  - An input validation error exists in the script     'acknow.php' that allows arbitrary script or HTML     injection via the 'backurl' parameter. (CVE-2011-2904)

  - An error exists related to 'zabbix_agentd' and     'vfs.file.cksum'. An attacker could cause excessive CPU     usage if the 'vfs.file.cksum' command is pointed at a     special device such as '/dev/urandom'. (CVE-2011-3263)

  - An information disclosure vulnerability exists in the     script 'popup.php' because the 'srcfld2' parameter is     not properly checked. This vulnerability can reveal     sensitive information such as the application's install     path. (CVE-2011-3264)

Note that Nessus has not tested for these flaws but has instead relied on the version in the Zabbix login page.

- update to 1.8.6

    - upstream changelog at       http://www.zabbix.com/rn1.8.6.php

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
71535	Zabbix 1.9.x < 1.9.4 zabbix_agentd DoS	Nessus	CGI abuses	medium
71089	GLSA-201311-15 : Zabbix: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
56091	Zabbix < 1.8.6 Multiple Vulnerabilities	Nessus	CGI abuses	medium
55947	Fedora 16 : zabbix-1.8.6-1.fc16 (2011-10583)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2011-3263

high

Tenable Plugins

medium

high

medium

medium