Find Out If Patch Number ( CVE ) Has Been Applied To RHEL / CentOS Linux

http://www.cyberciti.biz/faq/linux-find-out-patch-can-cve-applied

I know how to update my system using the yum command. But, how can I find out that patch has been applied to a package? How do I search CVE patch number applied to a package under a Red Hat Enterprise Linux/CentOS/RHEL/Fedora Linux based system?

You need to use the rpm command. Each rpm package stores information about patches including date, small description and CVE number. You can use the -q query option to display change information for the package.

rpm –changelog option

Use the command as follows:
rpm -q --changelog {package-name}
rpm -q --changelog {package-name} | more
rpm -q --changelog {package-name} | grep CVE-NUMBER

For example find out if CVE-2008-1927 has been applied to perl package or not, enter:
# rpm -q --changelog perl|grep CVE-2008-1927
Sample output:

- CVE-2008-1927 perl: double free on regular expressions with utf8 characters

List all applied patches for php, enter:
# rpm -q --changelog php
OR
# rpm -q --changelog php | more
Sample output:

* Tue Jun 03 2008 Joe Orton 5.1.6-20.el5_2.1 - add security fixes for CVE-2007-5898, CVE-2007-4782, CVE-2007-5899, CVE-2008-2051, CVE-2008-2107, CVE-2008-2108 (#445923)   * Tue Jan 15 2008 Joe Orton 5.1.6-20.el5 - use magic.mime provided by file (#240845) - fix possible crash with setlocale() (#428675)   * Thu Jan 10 2008 Joe Orton 5.1.6-19.el5 - ext/date: fix test cases for recent timezone values (#266441)   * Thu Jan 10 2008 Joe Orton 5.1.6-18.el5 - ext/date: updates for system tzdata support (#266441)   * Wed Jan 09 2008 Joe Orton 5.1.6-17.el5 - ext/date: use system timezone database (#266441)   * Tue Jan 08 2008 Joe Orton 5.1.6-16.el5 - add dbase extension in -common (#161639) - add /usr/share/php to builtin include_path (#238455) - ext/ldap: enable ldap_sasl_bind (#336221) - ext/libxml: reset stream context (#298031) ......... ... .... * Fri May 16 2003 Joe Orton 4.3.1-3 - link odbc module correctly - patch so that php -n doesn't scan inidir - run tests using php -n, avoid loading system modules   * Wed May 14 2003 Joe Orton 4.3.1-2 - workaround broken parser produced by bison-1.875   * Tue May 06 2003 Joe Orton 4.3.1-1 - update to 4.3.1; run test suite - open extension modules with RTLD_NOW rather than _LAZY

How do I find CVE for a rpm file itself?

Above command will query installed package only. To query rpm file, enter:
$ rpm -qp --changelog rsnapshot-1.3.0-1.noarch.rpm | more

Further readings:

• rpm command man page: rpm(8)