PROTOCOL-DNS -- Snort alerted on a Domain Name Server (DNS) protocol issue. These packets travel over UDP on port 53 to serve DNS queries--user website requests through a browser. Several vulnerability use-cases exist (ie, additional data could be sent with a request, which would contact a DNS server pre-prepared to send information back and forth).
PROTOCOL-DNS PHP dns_get_record out of bounds read attempt
This rule detects an attempted out of bound read in the dns_get_record function in vulnerable versions of PHP 7.x by looking for specific data within a DNS query response.
What To Look For
This rule detects an attempted out of bound read in the dns_get_record function in vulnerable versions of PHP 7.x.
No public information
No known false positives
Cisco Talos Intelligence Group
MITRE ATT&CK Framework
Tactic: Initial Access
Technique: External Remote Services
For reference, see the MITRE ATT&CK vulnerability types here:
Buffer Overflows occur when a memory location is filled past its expected boundaries. Computer attackers target systems without proper terminating conditions on buffers, which then write the additional information in other locations in memory, overwriting what is there. This could corrupt the data, making the system behave erratically or crash. The new information could include malicious executable code, which might be executed.
CVE Additional Information