Rule Category

SERVER-OTHER -- Snort has detected traffic exploiting vulnerabilities in a server in the network.

Alert Message

SERVER-OTHER Intel AMT HTTP invalid chunk size attempt

Rule Explanation

This rule looks for incoming negative chunk sizes in http packets.

What To Look For

Malformed HTTP requests with negative chunk sizes incoming to victim systems.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

MITRE ATT&CK Framework

Tactic: Impact

Technique: Firmware Corruption

For reference, see the MITRE ATT&CK vulnerability types here: https://attack.mitre.org

Rule Vulnerability

Buffer Overflow

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