#VU59116 Out-of-bounds write in uIP and Contiki OS - CVE-2020-17438

Vulnerability identifier: #VU59116

Vulnerability risk: Critical

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Red]

CVE-ID: CVE-2020-17438

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
uIP
Server applications / Other server solutions
Contiki OS
Operating systems & Components / Operating system

Vendor: Adam Dunkels
contiki-os.org

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing IP packets. 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. A remote attacker can send specially crafted IP packets to the system, trigger an out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

uIP: 1.0

Contiki OS: 3.0

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External links
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
https://www.kb.cert.org/vuls/id/815128

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.