CVE-2020-17437

 

Published at: - 12-12-2020 12:15

Last modified: - 08-08-2022 04:57

Total changes: - 4

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.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

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

 

Keywords

NVD

 

CVE-2020-17437

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures