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suricata/rules/dns-events.rules

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DNS: add event rules file
12 years ago
# Malformed data in request. Malformed means length fields are wrong, etc.
rules: add missing classtypes for event.rules
8 years ago
alert dns any any -> any any (msg:"SURICATA DNS malformed request data"; flow:to_server; app-layer-event:dns.malformed_data; classtype:protocol-command-decode; sid:2240002; rev:2;)
alert dns any any -> any any (msg:"SURICATA DNS malformed response data"; flow:to_client; app-layer-event:dns.malformed_data; classtype:protocol-command-decode; sid:2240003; rev:2;)
DNS: add event rules file
12 years ago
# Response flag set on to_server packet
rules/dns: fix dns event names that have changed - not_a_request to not_request - not_a_response to not_reponse Ticket: #7361
4 months ago
alert dns any any -> any any (msg:"SURICATA DNS Not a request"; flow:to_server; app-layer-event:dns.not_request; classtype:protocol-command-decode; sid:2240004; rev:3;)
DNS: add event rules file
12 years ago
# Response flag not set on to_client packet
rules/dns: fix dns event names that have changed - not_a_request to not_request - not_a_response to not_reponse Ticket: #7361
4 months ago
alert dns any any -> any any (msg:"SURICATA DNS Not a response"; flow:to_client; app-layer-event:dns.not_response; classtype:protocol-command-decode; sid:2240005; rev:3;)
DNS: add event rules file
12 years ago
# Z flag (reserved) not 0
rules: add missing classtypes for event.rules
8 years ago
alert dns any any -> any any (msg:"SURICATA DNS Z flag set"; app-layer-event:dns.z_flag_set; classtype:protocol-command-decode; sid:2240006; rev:2;)
dns: parse and alert on invalid opcodes Accept DNS messages with an invalid opcode that are otherwise valid. Such DNS message will create a parser event. This is a change of behavior, previously an invalid opcode would cause the DNS message to not be detected or parsed as DNS. Issue: #5444
2 years ago
alert dns any any -> any any (msg:"SURICATA DNS Invalid opcode"; app-layer-event:dns.invalid_opcode; classtype:protocol-command-decode; sid:2240007; rev:1;)
dns: provide events for recoverable parse errors Add events for the following resource name parsing issues: - name truncated as its too long - maximum number of labels reached - infinite loop Currently these events are only registered when encountered, but recoverable. That is where we are able to return some of the name, usually in a truncated state. As name parsing has many code paths, we pass in a pointer to a flag field that can be updated by the name parser, this is done in addition to the flags being set on a specific name as when logging we want to designate which fields are truncated, etc. But for alerts, we just care that something happened during the parse. It also reduces errors as it won't be forgotten to check for the flags and set the event if some new parser is written that also parses names. Ticket: #7280
4 months ago
# A resource name was too long (over 1025 chars)
alert dns any any -> any any (msg:"SURICATA DNS Name too long"; app-layer-event:dns.name_too_long; classtype:protocol-command-decode; sid:224008; rev:1;)
# An infinite loop was found while decoding a DNS resource name.
alert dns any any -> any any (msg:"SURICATA DNS Infinite loop"; app-layer-event:dns.infinite_loop; classtype:protocol-command-decode; sid:224009; rev:1;)
# Suricata's maximum number of DNS name labels was reached while parsing a resource name.
alert dns any any -> any any (msg:"SURICATA DNS Too many labels"; app-layer-event:dns.too_many_labels; classtype:protocol-command-decode; sid:224010; rev:1;)
dns: improved handling of corrupt additionals Ticket: 7228 That means log the rest of queries and answers, even if the final field additionals is corrupt. Set an event in this case.
6 months ago
alert dns any any -> any any (msg:"SURICATA DNS invalid additionals"; app-layer-event:dns.invalid_additionals; classtype:protocol-command-decode; sid:2240011; rev:1;)
alert dns any any -> any any (msg:"SURICATA DNS invalid authorities"; app-layer-event:dns.invalid_authorities; classtype:protocol-command-decode; sid:2240012; rev:1;)