Strange new rules added to my iptables config… Was my server hacked?
Today, I listed my iptables for a routine check -- and discovered two strange UFW rules that I don't remember setting up myself, referring to two specific IP addresses that I can't identify:
-A ufw-before-input -d 224.0.0.251/32 -p udp -m udp --dport 5353 -j ACCEPT
-A ufw-before-input -d 239.255.255.250/32 -p udp -m udp --dport 1900 -j ACCEPT
This is kind of scary. Did someone manage to hack into my server and add these rules? If not, what happened?
(And if some malicious agent did hack into my firewall, why would they use ports 5353 and 1900, that aren't being forwarded by my router??)
iptables firewall ufw hacking
asked Feb 9 at 23:44
killer_rabbitkiller_rabbit
112
add a comment |
Today, I listed my iptables for a routine check -- and discovered two strange UFW rules that I don't remember setting up myself, referring to two specific IP addresses that I can't identify:
-A ufw-before-input -d 224.0.0.251/32 -p udp -m udp --dport 5353 -j ACCEPT
-A ufw-before-input -d 239.255.255.250/32 -p udp -m udp --dport 1900 -j ACCEPT
This is kind of scary. Did someone manage to hack into my server and add these rules? If not, what happened?
(And if some malicious agent did hack into my firewall, why would they use ports 5353 and 1900, that aren't being forwarded by my router??)
iptables firewall ufw hacking
asked Feb 9 at 23:44
killer_rabbitkiller_rabbit
112
add a comment |
Today, I listed my iptables for a routine check -- and discovered two strange UFW rules that I don't remember setting up myself, referring to two specific IP addresses that I can't identify:
-A ufw-before-input -d 224.0.0.251/32 -p udp -m udp --dport 5353 -j ACCEPT
-A ufw-before-input -d 239.255.255.250/32 -p udp -m udp --dport 1900 -j ACCEPT
This is kind of scary. Did someone manage to hack into my server and add these rules? If not, what happened?
(And if some malicious agent did hack into my firewall, why would they use ports 5353 and 1900, that aren't being forwarded by my router??)
iptables firewall ufw hacking
asked Feb 9 at 23:44
killer_rabbitkiller_rabbit
112
Today, I listed my iptables for a routine check -- and discovered two strange UFW rules that I don't remember setting up myself, referring to two specific IP addresses that I can't identify:
-A ufw-before-input -d 224.0.0.251/32 -p udp -m udp --dport 5353 -j ACCEPT
-A ufw-before-input -d 239.255.255.250/32 -p udp -m udp --dport 1900 -j ACCEPT
This is kind of scary. Did someone manage to hack into my server and add these rules? If not, what happened?
(And if some malicious agent did hack into my firewall, why would they use ports 5353 and 1900, that aren't being forwarded by my router??)
iptables firewall ufw hacking
iptables firewall ufw hacking
asked Feb 9 at 23:44
killer_rabbitkiller_rabbit
112
asked Feb 9 at 23:44
killer_rabbitkiller_rabbit
112
asked Feb 9 at 23:44
killer_rabbitkiller_rabbit
112
asked Feb 9 at 23:44
killer_rabbitkiller_rabbit
112
asked Feb 9 at 23:44
killer_rabbitkiller_rabbit
112
112
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Quoting man ufw:
NOTES
On installation, ufw is disabled with a default incoming policy of
deny, a default forward policy of deny, and a default outgoing policy
of allow, with stateful tracking for NEW connections for incoming and
forwarded connections. In addition to the above, a default ruleset is
put in place that does the following:
[ ... ]
- ACCEPT mDNS (zeroconf/bonjour/avahi 224.0.0.251 for IPv4 and ff02::fb
for IPv6) for service discovery (INPUT)
- ACCEPT UPnP (239.255.255.250 for IPv4 and ff02::f for IPv6) for ser‐
vice discovery (INPUT)
So these two rules you are seeing are part of ufw's default settings and allow mDNS and UPnP services to work.
answered Feb 10 at 20:02
Byte CommanderByte Commander
65.6k27179302
Aha! Right, I should have checked the manpage. Thanks for the clarification!
– killer_rabbit
Feb 11 at 9:56
add a comment |
Googling says that those IP addresses are related to Simple Service Discovery Protocol (SSDP)/uPnP and iTunes. So it is likely that these rules are related to software you installed and relate to sharing information on a LAN. whois doesn't return any information for either IP.
See
https://stackoverflow.com/questions/12483717/what-is-the-multicast-doing-on-224-0-0-251
and
https://wiki.wireshark.org/SSDP
answered Feb 10 at 2:43
Organic MarbleOrganic Marble
11.3k63459
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Quoting man ufw:
NOTES
On installation, ufw is disabled with a default incoming policy of
deny, a default forward policy of deny, and a default outgoing policy
of allow, with stateful tracking for NEW connections for incoming and
forwarded connections. In addition to the above, a default ruleset is
put in place that does the following:
[ ... ]
- ACCEPT mDNS (zeroconf/bonjour/avahi 224.0.0.251 for IPv4 and ff02::fb
for IPv6) for service discovery (INPUT)
- ACCEPT UPnP (239.255.255.250 for IPv4 and ff02::f for IPv6) for ser‐
vice discovery (INPUT)
So these two rules you are seeing are part of ufw's default settings and allow mDNS and UPnP services to work.
answered Feb 10 at 20:02
Byte CommanderByte Commander
65.6k27179302
Aha! Right, I should have checked the manpage. Thanks for the clarification!
– killer_rabbit
Feb 11 at 9:56
add a comment |
Quoting man ufw:
NOTES
On installation, ufw is disabled with a default incoming policy of
deny, a default forward policy of deny, and a default outgoing policy
of allow, with stateful tracking for NEW connections for incoming and
forwarded connections. In addition to the above, a default ruleset is
put in place that does the following:
[ ... ]
- ACCEPT mDNS (zeroconf/bonjour/avahi 224.0.0.251 for IPv4 and ff02::fb
for IPv6) for service discovery (INPUT)
- ACCEPT UPnP (239.255.255.250 for IPv4 and ff02::f for IPv6) for ser‐
vice discovery (INPUT)
So these two rules you are seeing are part of ufw's default settings and allow mDNS and UPnP services to work.
answered Feb 10 at 20:02
Byte CommanderByte Commander
65.6k27179302
Aha! Right, I should have checked the manpage. Thanks for the clarification!
– killer_rabbit
Feb 11 at 9:56
add a comment |
Quoting man ufw:
NOTES
On installation, ufw is disabled with a default incoming policy of
deny, a default forward policy of deny, and a default outgoing policy
of allow, with stateful tracking for NEW connections for incoming and
forwarded connections. In addition to the above, a default ruleset is
put in place that does the following:
[ ... ]
- ACCEPT mDNS (zeroconf/bonjour/avahi 224.0.0.251 for IPv4 and ff02::fb
for IPv6) for service discovery (INPUT)
- ACCEPT UPnP (239.255.255.250 for IPv4 and ff02::f for IPv6) for ser‐
vice discovery (INPUT)
So these two rules you are seeing are part of ufw's default settings and allow mDNS and UPnP services to work.
answered Feb 10 at 20:02
Byte CommanderByte Commander
65.6k27179302
Quoting man ufw:
NOTES
On installation, ufw is disabled with a default incoming policy of
deny, a default forward policy of deny, and a default outgoing policy
of allow, with stateful tracking for NEW connections for incoming and
forwarded connections. In addition to the above, a default ruleset is
put in place that does the following:
[ ... ]
- ACCEPT mDNS (zeroconf/bonjour/avahi 224.0.0.251 for IPv4 and ff02::fb
for IPv6) for service discovery (INPUT)
- ACCEPT UPnP (239.255.255.250 for IPv4 and ff02::f for IPv6) for ser‐
vice discovery (INPUT)
So these two rules you are seeing are part of ufw's default settings and allow mDNS and UPnP services to work.
answered Feb 10 at 20:02
Byte CommanderByte Commander
65.6k27179302
answered Feb 10 at 20:02
Byte CommanderByte Commander
65.6k27179302
answered Feb 10 at 20:02
Byte CommanderByte Commander
65.6k27179302
answered Feb 10 at 20:02
Byte CommanderByte Commander
65.6k27179302
65.6k27179302
Aha! Right, I should have checked the manpage. Thanks for the clarification!
– killer_rabbit
Feb 11 at 9:56
add a comment |
Aha! Right, I should have checked the manpage. Thanks for the clarification!
– killer_rabbit
Feb 11 at 9:56
Aha! Right, I should have checked the manpage. Thanks for the clarification!
– killer_rabbit
Feb 11 at 9:56
Aha! Right, I should have checked the manpage. Thanks for the clarification!
– killer_rabbit
Feb 11 at 9:56
add a comment |
Googling says that those IP addresses are related to Simple Service Discovery Protocol (SSDP)/uPnP and iTunes. So it is likely that these rules are related to software you installed and relate to sharing information on a LAN. whois doesn't return any information for either IP.
See
https://stackoverflow.com/questions/12483717/what-is-the-multicast-doing-on-224-0-0-251
and
https://wiki.wireshark.org/SSDP
answered Feb 10 at 2:43
Organic MarbleOrganic Marble
11.3k63459
add a comment |
Googling says that those IP addresses are related to Simple Service Discovery Protocol (SSDP)/uPnP and iTunes. So it is likely that these rules are related to software you installed and relate to sharing information on a LAN. whois doesn't return any information for either IP.
See
https://stackoverflow.com/questions/12483717/what-is-the-multicast-doing-on-224-0-0-251
and
https://wiki.wireshark.org/SSDP
answered Feb 10 at 2:43
Organic MarbleOrganic Marble
11.3k63459
add a comment |
Googling says that those IP addresses are related to Simple Service Discovery Protocol (SSDP)/uPnP and iTunes. So it is likely that these rules are related to software you installed and relate to sharing information on a LAN. whois doesn't return any information for either IP.
See
https://stackoverflow.com/questions/12483717/what-is-the-multicast-doing-on-224-0-0-251
and
https://wiki.wireshark.org/SSDP
answered Feb 10 at 2:43
Organic MarbleOrganic Marble
11.3k63459
Googling says that those IP addresses are related to Simple Service Discovery Protocol (SSDP)/uPnP and iTunes. So it is likely that these rules are related to software you installed and relate to sharing information on a LAN. whois doesn't return any information for either IP.
See
https://stackoverflow.com/questions/12483717/what-is-the-multicast-doing-on-224-0-0-251
and
https://wiki.wireshark.org/SSDP
answered Feb 10 at 2:43
Organic MarbleOrganic Marble
11.3k63459
answered Feb 10 at 2:43
Organic MarbleOrganic Marble
11.3k63459
answered Feb 10 at 2:43
Organic MarbleOrganic Marble
11.3k63459
answered Feb 10 at 2:43
Organic MarbleOrganic Marble
11.3k63459
11.3k63459
add a comment |
add a comment |
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