Ossim 中漏洞扫描详解

 

Openvas是一套开源漏洞扫描系统,如果手动搭建需要复杂的过程,花费不少人力和时间成本,因为它是套免费的漏洞扫描系统,功能上不逊色于商业版的漏洞扫描器,受到不少用户的青睐,下表对比了NeXpose、RSAS和启明的漏洞扫描器的主要功能。

wKioL1ZmSn-DvJ1AAA0R5JyJkC4100.jpg

 

有了以上背景之后,下文主要针对OSSIM平台下如何以图形化方式操作漏洞扫描的过程。

 

准备工作:首先确保没有运行的扫描进程和任务

wKiom1XtftnAx7HPAAF1CBy1EHI820.jpg

扫描漏洞同时升级漏洞库会导致升级失败。

 

第一步同步插件

#openvas-nvt-sync

[i] This script synchronizes an NVT collection with the 'OpenVAS NVT Feed'.

[i] The 'OpenVAS NVT Feed' is provided by 'The OpenVAS Project'.

[i] Online information about this feed: 'http://www.openvas.org/openvas-nvt-feed.html'.

[i] NVT dir: /var/lib/openvas/plugins

[i] Will use rsync

[i] Using rsync: /usr/bin/rsync

[i] Configured NVT rsync feed: rsync://feed.openvas.org:/nvt-feed

OpenVAS feed server - http://www.openvas.org/

This service is hosted by Intevation GmbH - http://intevation.de/

All transactions are logged.

Please report synchronization problems to openvas-feed@intevation.de.

If you have any other questions, please use the OpenVAS mailing lists

or the OpenVAS IRC chat. See http://www.openvas.org/ for details.

receiving incremental file list

deleting gb_openssl_38562.nasl.asc

deleting gb_openssl_38562.nasl

./

COPYING

         588 100%  574.22kB/s    0:00:00 (xfer#1, to-check=13347/13355)

COPYING.GPLv2

       18002 100%   17.17MB/s    0:00:00 (xfer#2, to-check=13346/13355)

COPYING.files

     1819904 100%    1.77MB/s    0:00:00 (xfer#3, to-check=13345/13355)

DDI_Directory_Scanner.nasl

       32957 100%   32.74kB/s    0:00:00 (xfer#4, to-check=13342/13355)

DDI_Directory_Scanner.nasl.asc

         198 100%    0.20kB/s    0:00:00 (xfer#5, to-check=13341/13355)

... ...

同步数万个插件时间比较长,消耗资源不大,可以去喝杯咖啡啦,或者了解一下插件的组成。

 

            表1 Openvas主要脚本分类及分布情况

 

规则名称

数量

备注

IIS_frontpage_DOS_2.nasl

1

phpbb

8

RA_ssh_detect

RA_www_css

RA_www_detect

3

RHSA_2009_03**

279

Redhat Security Advisory

3com_switches

1

weblogic*

3

cisco_ids

cisco_***

ciscoworks

16

awstats

4

apache

23

DDI

30

EZ_hotscripts

3

anti_nessus

1

basilix

8

bluecoat

1

bugbear

3

bugzilla

9

ca_unicenter

2

cacti

5

calendar

3

Spoll_7_5_sql_injection

2

avaya_switches

1

citrix

8

clamav

2

CUPS

12

cutenews

12

checkpoint

6

cheopsNG

4

cvstrac

24

DB2

4

deb_*.nasl

2595

Debian Linux

DNS

5

deluxeBB

3

eftp

3

ls exchange*

exchange

2

fcore

684

find_service

5

fortigate

1

freebsd

2009

ftp

30

gb_CESA

1528

gb_RHSA

871

gb_adobe

167

gb_apple

70

gb_baofeng_storm

3

gb_bpsoft

3

gb_clamav

16

gb_ccproxy

2

gb_clamav

16

gb_fedora

4679

gb_google

162

gb_hp_ux

242

HP-UNIX

gb_ibm_db2

27

gb_ibm_websphere

8

gb_ibm_tivoli

5

gb_ibm_was

16

gb_ibm_lotus

10

gb_mandriva

1684

gb_java

2

gb_kaspersky

6

gb_google_chrome

153

gb_foxmail

2

gb_fsecure

7

gb_ms

155

Windows 相关

gb_ubuntu

1261

gb_samba

12

gb_sun_java

35

gb_wireshark

87

glsa

1727

gb_vmware

41

IIS

20

lotus

5

ipswitch

5

mysql

5

gb_nmap

187

nortel

7

nagios

5

openssh

4

oscommerce

5

postgresql

5

phpgroupware

12

phpmyadmin

7

phpbb

8

smb

52

sendmail

15

suse

65

ssh

11

smtp

9

Ubuntu

179

tomcat

6

tftp

11

wu_ftpd

6

 

第二步更新插件(做这一步操作,建议在轻负载下进行)

#perl /usr/share/ossim/scripts/vulnmeter/updateplugins.pl migrate            /* 比较消耗CPU和磁盘I/O  */

2015-09-07 07:27:33   Framework profile has been found...

2015-09-07 07:27:33   Deleting all tasks in 192.168.11.150 ...

2015-09-07 07:27:33   updateplugins: configured to not updateplugins

2015-09-07 07:27:33   updateplugins: configured to not repair DB

2015-09-07 07:27:33   BEGIN  - DUMP PLUGINS

2015-09-07 07:29:01   FINISH - DUMP PLUGINS [ Process took 88 seconds ]

2015-09-07 07:29:01   BEGIN  - IMPORT PLUGINS

2015-09-07 07:30:00   FINISH - IMPORT PLUGINS [ 40473 plugins - Process took 59 seconds ]

2015-09-07 07:30:00   BEGIN  - UPDATE CATEGORIES

2015-09-07 07:30:00   FINISH - UPDATE CATEGORIES [ Process took 0 seconds ]

2015-09-07 07:30:00   BEGIN  - UPDATE FAMILIES

2015-09-07 07:30:00   FINISH - UPDATE FAMILIES [ Process took 0 seconds ]

2015-09-07 07:30:00   BEGIN  - UPDATE OPENVAS_PLUGINS

2015-09-07 07:30:03   FINISH - UPDATE OPENVAS_PLUGINS [ Process took 3 seconds ]

2015-09-07 07:30:03   BEGIN  - UPDATE NESSUS_PREFERENCES

2015-09-07 07:30:03   show tables like "vuln_nessus_preferences_defaults"

2015-09-07 07:30:03   updateprefs: Getting plugin preferences

2015-09-07 07:30:05   FINISH - UPDATE NESSUS_PREFERENCES [ Process took 2 seconds ]

 

2015-09-07 07:30:06   Creating Deep profile...

2015-09-07 07:30:06   Filling categories...............

2015-09-07 07:30:06   Done

2015-09-07 07:30:06   Filling families.............................................................

2015-09-07 07:30:06   Done

2015-09-07 07:30:06   Filling plugins...

2015-09-07 07:30:13   Filling preferences in Alienvault DB...

2015-09-07 07:30:14   Done

2015-09-07 07:30:14   Deep profile inserted

 

2015-09-07 07:30:15   Creating Default profile...

2015-09-07 07:30:15   Filling categories...............

2015-09-07 07:30:15   Done

2015-09-07 07:30:15   Filling families.............................................................

2015-09-07 07:30:15   Done

2015-09-07 07:30:15   Filling plugins...

2015-09-07 07:30:23   Filling preferences in Alienvault DB...

2015-09-07 07:30:24   Done

2015-09-07 07:30:24   Default profile inserted

 

2015-09-07 07:30:24   Creating Ultimate profile...

2015-09-07 07:30:24   Filling categories...............

2015-09-07 07:30:24   Done

2015-09-07 07:30:24   Filling families.............................................................

2015-09-07 07:30:24   Done

2015-09-07 07:30:24   Filling plugins...

2015-09-07 07:30:32   Filling preferences in Alienvault DB...

2015-09-07 07:30:33   Done

2015-09-07 07:30:33   Ultimate profile inserted

 

2015-09-07 07:30:33   BEGIN  - UPDATE PORT SCANNER

2015-09-07 07:30:35   FINISH - UPDATE PORT SCANNER [ Process took 2 seconds ]

 

Updating plugin_sid vulnerabilities scanner ids

plugins fetched

Updating...

Script id:94151, Name:IT-Grundschutz M4.288: Sichere Administration von VoIP-Endger?ten, Priority:0

Script id:703073, Name:Debian Security Advisory DSA 3073-1 (libgcrypt11 - security update), Priority:1

Script id:804624, Name:Adobe Reader Plugin Signature Bypass Vulnerability (Windows), Priority:2

Script id:868149, Name:Fedora Update for kernel FEDORA-2014-9959, Priority:5

Script id:95048, Name:IT-Grundschutz M5.145: Sicherer Einsatz von CUPS, Priority:0

Script id:842216, Name:Ubuntu Update for linux USN-2616-1, Priority:4

Script id:105036, Name:Open*** Detection, Priority:0

Script id:868005, Name:Fedora Update for audacious-plugins FEDORA-2014-8183, Priority:1

Script id:869350, Name:Fedora Update for springframework FEDORA-2015-6862, Priority:5

 

… …

 

Script id:105084, Name:Multiple ManageEngine Products  Arbitrary File Upload Vulnerability, Priority:3

Script id:867751, Name:Fedora Update for python-keystoneclient FEDORA-2014-5555, Priority:3

Script id:882209, Name:CentOS Update for nss CESA-2015:1185 centos6, Priority:2

Script id:842209, Name:Ubuntu Update for libmodule-signature-perl USN-2607-1, Priority:5

 

经过一刻钟等待终于更新完成。注意,该过程需要一气呵成,中途不能强制退出。

 

下面用时间轴表示每个步骤的演进顺序和所花费的时间,如下图所示。从某日的00:34:34开始到00:38:50结束的过程。

wKiom1XunICxpgxEAAIHATM9vVg625.jpg


如果有些用户不习惯在CLI下操作升级命令,这一工作同样可以在WebUI中完成。

wKioL1X0vLfA3pxgAAU5hxIK-AE652.jpg




第三步验证更新

wKioL1XtgIbA2ed0AAR2Om_EnAw841.jpg

我们看到最后一行显示总数为40473,这个数值和下载的插件数量一直,代表升级完成。


注意:漏洞升级视频大家可访问:http://www.tudou.com/programs/view/kyTmc42Ky14/


第四步:开始漏洞扫描-定制策略

首先扫描资产,建立资源池,这里就不详细介绍。在OSSIM系统里默认定义了三种策略,默认为Default,该策略最为常用。

wKioL1XtgxnBYERyAAFhgWecCV8590.jpg

如果需要更改策略,请点击CREATE NEW PROFILE按钮。

wKiom1XtgaeySCgUAAPyD_PqcrQ798.jpg接着开始扫描,填写任务名称,选择Sensor,选择策略,选择资源池内的主机,最后点击新建任务按钮。

wKioL1XthFPw2OLmAAbfSbhMeXQ389.jpg

 

扫描准备

wKioL1XthifBwPEPAAIscflNE6o315.jpg

 

漏洞扫描时那些进程最繁忙?

HtopLinux系统中的一个互动的进程查看工具命令可以帮助管理员了解扫描发生的变化。#htop  -d 50

wKiom1XunnSB3E1pAAJIvu_AV9k860.jpg

一次扫描多少机器合适?

如果所监控网段服务器数量超过25台,这里假设是100台,那么至少分4次扫描,例如直接输入“192.168.11.0/24”,这样表示一个网段,那么OSSIM系统负载将会明显增大,扫描等待时间明显延长,可能会长达数天,直到超过一个计划任务的周期,这样可能造成一个恶性循环,直到拖垮整个系统

wKiom1YMif6xBpKLAAJ3eeK0270268.jpg

进过300多分钟都没有结束的任务最后逃脱不了失败的命运。


wKioL1XuoFGDWCkTAAL-c7u2q-c994.jpg

扫描结果分析

wKiom1XtgtLD69KEAAMHdkgxZ68595.jpg

wKioL1XthPyyMvQxAANaYKVbrOs014.jpg

 不过在分析时,谈到“过时”的漏洞问题,在一些古老些操作系统Windows NT/2000Solaris7/8Linux2.2 2.4内核)曾经存在的那些系统漏洞、网络服务器漏洞,在现代系统中已经绝迹,受影响系统已经被修复,这种漏洞变得没有任何价值。对这些系统进行漏洞扫描变得没有意义。