#VU59115 Out-of-bounds write in uIP and Contiki OS - CVE-2020-17437

Vulnerability identifier: #VU59115

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-2020-17437

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 TCP packets with Urgent flag. A remote attacker can send specially crafted traffic 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://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf
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.