CVE-2018-19417

An issue was discovered in the MQTT server in Contiki-NG before 4.2. The function parse_publish_vhdr() that parses MQTT PUBLISH messages with a variable length header uses memcpy to input data into a fixed size buffer. The allocated buffer can fit only MQTT_MAX_TOPIC_LENGTH (default 64) bytes, and a length check is missing. This could lead to Remote Code Execution via a stack-smashing attack (overwriting the function return address). Contiki-NG does not separate the MQTT server from other servers and the OS modules, so access to all memory regions is possible.

• CVE ID
• CVE-2018-19417

• Assigner
• cve@mitre.org

• Vulnerability Status
• Analyzed

• Published Version
• 2018-11-21T20:29:00

• Last Modified Date
• 2019-02-04T18:19:13

• Version
• 2.0

• Vector String
• AV:N/AC:L/Au:N/C:C/I:C/A:C

• Access Vector
• NETWORK

• Access Compatibility
• LOW

• Authentication
• NONE

• Confidentiality Impact
• COMPLETE

• Integrity Impact
• COMPLETE

• Availability Impact
• COMPLETE

• Base Score
• 10

• Severity
• HIGH

• Exploitability Score
• 10

• Impact Score
• 10

• Version
• 3.0

• Vector String
• CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

• Attack Vector
• NETWORK

• Attack Compatibility
• LOW

• Privileges Required
• NONE

• User Interaction
• NONE

• Scope
• CHANGED

• Confidentiality Impact
• HIGH

• Availability Impact
• HIGH

• Base Score
• 10

• Base Severity
• CRITICAL

• Exploitability Score
• 3.9

• Impact Score
• 6