[[267757]]

我們過去曾寫過兩篇關于這個主題的文章，每篇文章都是根據不同的要求發表的。如果你想在開始之前瀏覽這些文章。請通過以下鏈接：

• 如何檢查 RHEL 和 CentOS 上的可用安全更新？
• 在 RHEL 和 CentOS 上安裝安全更新的四種方法？

這些文章與其他文章相互關聯，因此，在深入研究之前，最好先閱讀這些文章。

在本文中，我們將向你展示如何檢查已安裝的安全更新。我會介紹兩種方法，你可以選擇最適合你的。

此外，我還添加了一個小的 shell 腳本，它為你提供已安裝的安全包計數。

運行以下命令獲取系統上已安裝的安全更新的列表。

# yum updateinfo list security installed
 
Loaded plugins: changelog, package_upload, product-id, search-disabled-repos,
              : subscription-manager, verify, versionlock
RHSA-2015:2315 Moderate/Sec.  ModemManager-glib-1.1.0-8.git20130913.el7.x86_64
RHSA-2015:2315 Moderate/Sec.  NetworkManager-1:1.0.6-27.el7.x86_64
RHSA-2016:2581 Low/Sec.       NetworkManager-1:1.4.0-12.el7.x86_64
RHSA-2017:2299 Moderate/Sec.  NetworkManager-1:1.8.0-9.el7.x86_64
RHSA-2015:2315 Moderate/Sec.  NetworkManager-adsl-1:1.0.6-27.el7.x86_64
RHSA-2016:2581 Low/Sec.       NetworkManager-adsl-1:1.4.0-12.el7.x86_64
RHSA-2017:2299 Moderate/Sec.  NetworkManager-adsl-1:1.8.0-9.el7.x86_64
RHSA-2015:2315 Moderate/Sec.  NetworkManager-bluetooth-1:1.0.6-27.el7.x86_64

要計算已安裝的安全包的數量，請運行以下命令：

# yum updateinfo list security installed | wc -l
1046

僅打印安裝包列表：

# yum updateinfo list security all | grep -w "i"
 
i RHSA-2015:2315 Moderate/Sec.  ModemManager-glib-1.1.0-8.git20130913.el7.x86_64
i RHSA-2015:2315 Moderate/Sec.  NetworkManager-1:1.0.6-27.el7.x86_64
i RHSA-2016:2581 Low/Sec.       NetworkManager-1:1.4.0-12.el7.x86_64
i RHSA-2017:2299 Moderate/Sec.  NetworkManager-1:1.8.0-9.el7.x86_64
i RHSA-2015:2315 Moderate/Sec.  NetworkManager-adsl-1:1.0.6-27.el7.x86_64
i RHSA-2016:2581 Low/Sec.       NetworkManager-adsl-1:1.4.0-12.el7.x86_64
i RHSA-2017:2299 Moderate/Sec.  NetworkManager-adsl-1:1.8.0-9.el7.x86_64
i RHSA-2015:2315 Moderate/Sec.  NetworkManager-bluetooth-1:1.0.6-27.el7.x86_64
i RHSA-2016:2581 Low/Sec.       NetworkManager-bluetooth-1:1.4.0-12.el7.x86_64
i RHSA-2017:2299 Moderate/Sec.  NetworkManager-bluetooth-1:1.8.0-9.el7.x86_64
i RHSA-2015:2315 Moderate/Sec.  NetworkManager-config-server-1:1.0.6-27.el7.x86_64
i RHSA-2016:2581 Low/Sec.       NetworkManager-config-server-1:1.4.0-12.el7.x86_64
i RHSA-2017:2299 Moderate/Sec.  NetworkManager-config-server-1:1.8.0-9.el7.noarch

要計算已安裝的安全包的數量，請運行以下命令：

# yum updateinfo list security all | grep -w "i" | wc -l
1043

或者，你可以檢查指定包修復的漏洞列表。

在此例中，我們將檢查 “openssh” 包中已修復的漏洞列表：

# rpm -q --changelog openssh | grep -i CVE
 
- Fix for CVE-2017-15906 (#1517226)
- CVE-2015-8325: privilege escalation via user's PAM environment and UseLogin=yes (#1329191)
- CVE-2016-1908: possible fallback from untrusted to trusted X11 forwarding (#1298741)
- CVE-2016-3115: missing sanitisation of input for X11 forwarding (#1317819)
- prevents CVE-2016-0777 and CVE-2016-0778
- Security fixes released with openssh-6.9 (CVE-2015-5352) (#1247864)
- only query each keyboard-interactive device once (CVE-2015-5600) (#1245971)
- add new option GSSAPIEnablek5users and disable using ~/.k5users by default CVE-2014-9278
- prevent a server from skipping SSHFP lookup - CVE-2014-2653 (#1081338)
- change default value of MaxStartups - CVE-2010-5107 (#908707)
- CVE-2010-4755
- merged cve-2007_3102 to audit patch
- fixed audit log injection problem (CVE-2007-3102)
- CVE-2006-5794 - properly detect failed key verify in monitor (#214641)
- CVE-2006-4924 - prevent DoS on deattack detector (#207957)
- CVE-2006-5051 - don't call cleanups from signal handler (#208459)
- use fork+exec instead of system in scp - CVE-2006-0225 (#168167)

同樣，你可以通過運行以下命令來檢查相應的包中是否修復了指定的漏洞：

# rpm -q --changelog openssh | grep -i CVE-2016-3115
 
- CVE-2016-3115: missing sanitisation of input for X11 forwarding (#1317819)

如何使用 Shell 腳本計算安裝的安全包？

我添加了一個小的 shell 腳本，它可以幫助你計算已安裝的安全包列表。

# vi /opt/scripts/security-check.sh
 
#!/bin/bash
echo "+-------------------------+"
echo "|Security Advisories Count|"
echo "+-------------------------+"
for i in Important Moderate Low
do
    sec=$(yum updateinfo list security installed | grep $i | wc -l)
    echo "$i: $sec"
done | column -t
echo "+-------------------------+"

給 security-check.sh 文件執行權限。

$ chmod +x security-check.sh

最后執行腳本統計。

# sh /opt/scripts/security-check.sh
 
+-------------------------+
|Security Advisories Count|
+-------------------------+
Important:  480
Moderate:   410
Low:        111
+-------------------------+