Re: No semantic av rules displayed by "sesearch -A -s httpd_sys_script_t -p name_bind -C | grep -v ^D"

[Shintaro Fujiwara <shintaro.fujiwara@xxxxxxxxx>]

Thanks, Dan.

I will re-think on boolean permission on my server.

And thank you on your blog post.

2014-11-05 6:04 GMT+09:00 Daniel J Walsh <dwalsh@xxxxxxxxxx>:

On 10/31/2014 10:57 PM, Shintaro Fujiwara wrote:

On my fedora20 box, I tried to check Bash Expoit as Dan did on his latest blog post.

What I got is,

[root@xxxx ~]# sesearch -A -s httpd_sys_script_t -p name_bind -C | grep -v ^D
Found 12 semantic av rules:

Though 12 rules caught by sesearch, but none displayed.

 Next I typed,

[root@xxxx ~]# sesearch -A -s httpd_sys_script_t -p name_connect -C | grep -v ^D
Found 24 semantic av rules:
   allow nsswitch_domain dns_port_t : tcp_socket { recv_msg send_msg name_connect } ;
   allow nsswitch_domain dnssec_port_t : tcp_socket name_connect ;
ET allow httpd_sys_script_t gds_db_port_t : tcp_socket name_connect ; [ httpd_can_network_connect_db ]
ET allow httpd_sys_script_t mysqld_port_t : tcp_socket { recv_msg send_msg name_connect } ; [ httpd_can_network_connect_db ]
ET allow nsswitch_domain ocsp_port_t : tcp_socket name_connect ; [ kerberos_enabled ]
ET allow httpd_sys_script_t postgresql_port_t : tcp_socket { recv_msg send_msg name_connect } ; [ httpd_can_network_connect_db ]
ET allow httpd_sys_script_t oracle_port_t : tcp_socket name_connect ; [ httpd_can_network_connect_db ]
ET allow httpd_sys_script_t mssql_port_t : tcp_socket name_connect ; [ httpd_can_network_connect_db ]
ET allow nsswitch_domain kerberos_port_t : tcp_socket { recv_msg send_msg name_connect } ; [ kerberos_enabled ]
ET allow httpd_sys_script_t port_type : tcp_socket { recv_msg send_msg name_connect } ; [ httpd_enable_cgi httpd_can_network_connect && ]

This is ok.

What's wrong with name_bind thing?

I use
setools-console                    x86_64                    3.3.7-41.fc20

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name_bind allows you to listen on a port, which could be used to establish a back door for incoming connections.  Since you turned on some booleans, you are allowed to connect to more network ports.

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日本にヘヴィメタル・ハードロックを根付かせるページ

http://heavymetalhardrock.no-ip.info/

世界中でセキュアＯＳのSELinuxを使いやすくするフリーソフト
http://sourceforge.net/projects/segatex/

CMS（PHPとPostgreSQLを使ったフリーソフト）

http://sourceforge.net/projects/webon/
https://github.com/intrajp/irforum_jp

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selinux mailing list
selinux@xxxxxxxxxxxxxxxxxxxxxxx
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