Buffer overflow in Contiki-Os Contiki
CVE-2020-17438
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.
Vulnerability class: Buffer Overflow
EPSS: 0.193 (97.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Contiki-os Contiki — versions 3.0
- Uip_project Uip — versions 1.0
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (US Government Resource, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (US Government Resource, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2020-17438?
- CVE-2020-17438 is a critical-severity vulnerability in Contiki-Os Contiki, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2020-12-11.
- How severe is CVE-2020-17438?
- Critical severity. CVSS v3 base score is 9.8 out of 10.