[Snort-users] my logs is flooding with snort w/ some weird message about port 53

Ramin Alidousti ramin at ...2444...
Tue Sep 4 12:32:03 EDT 2001


I think that your dns server (named) has been told to send
out queries with port (53). These are the responses coming
back. Take a look at "/etc/named.conf" and see if you have
such an entry:

options {
	...
	query-source address * port 53;
	...
};

If you comment this out then the queries sent out by your
server will be from the unprivileged ports (>1023) and sort
will not complain. Otherwise, take a look at:

misc.rules:

alert udp $EXTERNAL_NET 53 -> $HOME_NET :1023 (msg:"MISC source port 53 to <1024"; classtype:bad-unknown; sid:515; rev:2;)

Hope it helps,
Ramin



On Tue, Sep 04, 2001 at 02:47:19PM -0400, alexus wrote:

> hello
> 
> for some reason i get a lot of traffic on my port 53, even though my
> nameserver is closed for public, can someone explain me what does that mean?
> 
> Sep  4 14:44:05 box snort[11565]: [1:515:2] MISC source port 53 to <1024
> [Classification: Potentially Bad Traffic] [Priority: 2]: {UDP}
> 24.69.255.195:53 -> 66.92.98.145:53
> Sep  4 14:44:08 box snort[11565]: [1:515:2] MISC source port 53 to <1024
> [Classification: Potentially Bad Traffic] [Priority: 2]: {UDP}
> 194.67.2.114:53 -> 66.92.98.145:53
> Sep  4 14:44:08 box snort[11565]: [1:515:2] MISC source port 53 to <1024
> [Classification: Potentially Bad Traffic] [Priority: 2]: {UDP}
> 207.236.57.98:53 -> 66.92.98.145:53
> Sep  4 14:44:08 box snort[11565]: [1:515:2] MISC source port 53 to <1024
> [Classification: Potentially Bad Traffic] [Priority: 2]: {UDP}
> 207.236.57.98:53 -> 66.92.98.145:53
> 
> just for example right now it's 2:45pm and since morning i already got
> 
> su-2.05# grep -c "MISC source port 53" /var/log/all.log
> 9222
> su-2.05#
> 
> of those entryes in my log
> 
> please help
> 
> if this a legit traffic which rule i can comment out so it wont show in my
> logs? and if this traffic is legit why is it shows as "potentially bad
> traffic"?
> 
> thanks in advance
> 
> 
> 
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