#VU60340 Out-of-bounds write in SeaConnect 370W - CVE-2021-21970

Vulnerability identifier: #VU60340

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-21970

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SeaConnect 370W
Hardware solutions / Firmware

Vendor: Sealevel Systems

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in the HandleSeaCloudMessage functionality within the json name key value. A remote attacker can perform a man-in-the-middle attack, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SeaConnect 370W: 1.3.34

---

External links
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1396

---

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.