CVE-2020-17438: uip_project uip Out-of-bounds Write

Vulnerability summary

CVE-2020-17438 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in uip_project uip. EPSS estimates a 19.29% chance of exploitation in the next 30 days, higher than 97.3% of scored vulnerabilities.

Timeline

1. 11-12-2020
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that reassembles fragmented packets fails to properly validate the total length of an incoming packet specified in its IP header, as well as the fragmentation offset value specified in the IP header. By crafting a packet with specific values of the IP header length and the fragmentation offset, attackers can write into the .bss section of the program (past the statically allocated buffer that is used for storing the fragmented data) and cause a denial of service in uip_reass() in uip.c, or possibly execute arbitrary code on some target architectures.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.