#VU29089 Improper Handling of Length Parameter Inconsistency in TCP/IP stack - CVE-2020-11896

Vulnerability identifier: #VU29089

Vulnerability risk: High

CVSSv4.0: 8.9 [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:P/U:Amber]

CVE-ID: CVE-2020-11896

CWE-ID: CWE-130

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
TCP/IP stack
Other software / Other software solutions

Vendor: Placeful Inc.

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to improper handling of length parameter inconsistency in IPv4/UDP component. A remote attacker can send a specially crafted packet and execute arbitrary code on the target system. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

TCP/IP stack: before 6.0.1.66

---

External links
https://ics-cert.us-cert.gov/advisories/icsa-20-168-01
https://treck.com/vulnerability-response-information/
https://kb.cert.org/vuls/id/257161

---

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. However, proof of concept for this vulnerability is available.