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Old 05-07-2012, 06:47 AM   #1
vitthal_jamdade
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Smile How to resolve attack done on server by some IP via httpd?


pl find below logs. can you please help me to analyse logs.

kernel: type=1400 audit(1319525689.800:13979617): avc: denied { getopt } for pid=16179 comm="httpd" laddr=209.x.x.x lport=52106 faddr=209.x.x.x fport=443 scontext=user_u:system_r:bootloader_t:s0 tcontext=user_u:system_r:bootloader_t:s0 tclass=tcp_socket

PS:IP addresses are changed for security reason.

Vitthal
 
Old 05-07-2012, 06:59 AM   #2
Slackyman
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First of all make sure you have granted httpd all security permission and grants: http://wiki.eri.ucsb.edu/sysadm/SELinux#HTTPD
Second: it's possible that a script (php, cgi etc) invokes a httpd legit function that it's blocked by SELinux.
Third: a Whois of the IP Address is often useul to check if the IP Address is in some blacklist.
The strange thing is the context of httpd: "user_u:system_r:bootloader_t:s0" why httpd has bootloader context access? Maybe it's really a kind of attack trying to access boot sector or bootloader or maybe, there's a misconfiguration in httpd or the problem happens at boot time during init (?!?).

Last edited by Slackyman; 05-07-2012 at 07:17 AM.
 
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Old 05-07-2012, 07:15 AM   #3
vitthal_jamdade
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Hi Slackyman,

Thanks for reply. Can u pl tel me is it better idea to stop SElinux if the servers are protected by network firewall.

vitthal
 
Old 05-07-2012, 07:15 AM   #4
vitthal_jamdade
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Hi Slackyman,

Thanks for reply. Can u pl tel me is it better idea to stop SElinux if the servers are protected by network firewall.

vitthal
 
Old 05-07-2012, 07:32 AM   #5
Slackyman
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I don't think that stopping SELinux is a great idea if the firewall is not well-configured.
I mean: I use Slackware without SELinux but I use iptables and my system keep a trace of any incoming and outcoming connection so that I can inspect what's happening and re-arrange my configuration but if you use Fedora or CentOS or any other distro using it I suggest you to keep it working.
 
Old 05-09-2012, 04:57 PM   #6
unSpawn
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Quote:
Originally Posted by vitthal_jamdade View Post
scontext=user_u:system_r:bootloader_t:s0 tcontext=user_u:system_r:bootloader_t:s0
...looks like the wrong context to me for the web server. Should be httpd_.* AFAIK.
 
  


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