CVE-2020-17437 Information

Description

An issue was discovered in uIP 1.0 as used in Contiki 3.0 and other products. When the Urgent flag is set in a TCP packet and the stack is configured to ignore the urgent data the stack attempts to use the value of the Urgent pointer bytes to separate the Urgent data from the normal data by calculating the offset at which the normal data should be present in the global buffer. However the length of this offset is not checked; therefore for large values of the Urgent pointer bytes the data pointer can point to memory that is way beyond the data buffer in uip_process in uip.c.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Reference

https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01 https://www.kb.cert.org/vuls/id/815128 https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

HIGH

Base Severity

8.2