# What is CVE-2018-3856? > CVE-2018-3856 is a critical-severity flaw (CVSS 9.9) in Sth-Eth-250 from Samsung, published on 23 August 2018. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 3.4%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.edgeprotect.io/what-is/cve-2018-3856 ## At a glance - **Verdict:** Fix this soon. Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month. - **EdgeProtect risk score:** 60 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** Critical (CVSS 9.9 out of 10) - **Known to be exploited:** No, not on the list of flaws known to be exploited today - **Chance of use in the next 30 days:** 3.4% (latest exploit-likelihood forecast) - **Published:** 23 August 2018 - **Record last updated:** 3 December 2022 - **Main product:** Sth-Eth-250 from Samsung - **Affected products:** 2 ## What is CVE-2018-3856? In plain terms It can be attacked from anywhere on the internet with an ordinary user account, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### The official description An exploitable vulnerability exists in the smart cameras RTSP configuration of the Samsung SmartThings Hub STH-ETH-250 - Firmware version 0.20.17. The device incorrectly handles spaces in the URL field, leading to an arbitrary operating system command injection. An attacker can send a series of HTTP requests to trigger this vulnerability. ### What kind of flaw is it? - CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') ### How an attack on it works - Where an attacker can be: Anywhere on the internet - How hard it is to pull off: Easy: no special conditions - Login needed first: An ordinary user account - Does someone have to click: No, nobody has to do anything - What an attacker gets: Can read data, change data and take it offline Severity vector: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H` ## Is CVE-2018-3856 being exploited? Not that we know of It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 3.4%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 3.4%, 3.4%, 3.4%, 3.4%, 3.4%, 3.4%, 3.4%. ### Timeline - 23 August 2018: Published - 3 December 2022: Record last updated ### How EdgeProtect ranks it CVE-2018-3856 scores **60 out of 100 (Medium)**, with the action "Plan remediation". Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less: - Evidence it is being exploited: biggest factor - How severe it is: strong factor - How widely exposed it is: key context - Real threat activity around it: key context 85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it. ## Who is affected by CVE-2018-3856? The published record lists 2 products. - [Sth-Eth-250](https://www.edgeprotect.io/product/samsung/sth-eth-250) by [Samsung](https://www.edgeprotect.io/vendors/samsung) (Hardware): version not specified - [Sth-Eth-250 Firmware](https://www.edgeprotect.io/product/samsung/sth-eth-250_firmware) by [Samsung](https://www.edgeprotect.io/vendors/samsung) (Operating system): 0.20.17 ## How do I fix CVE-2018-3856? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? EdgeProtect can work it out from your public website, or you can pick it from a list. 2. **Apply the vendor’s fix.** Install the latest update from the vendor. The references list where the vendor has published details. 3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in. 4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood. ### References - [talosintelligence.com](https://talosintelligence.com/vulnerability_reports/TALOS-2018-0539) (Exploit, Third-party advisory) ## Questions ### What is CVE-2018-3856? CVE-2018-3856 is a critical-severity flaw in Sth-Eth-250 from Samsung, published on 23 August 2018. It can be attacked from anywhere on the internet with an ordinary user account, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### How serious is CVE-2018-3856? It scores 9.9 out of 10 on the CVSS severity scale, which is critical. Our risk score for CVE-2018-3856 is 60 out of 100, which is Medium. Its action is "Plan remediation". Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month. ### Is CVE-2018-3856 being exploited? It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 3.4%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2018-3856 affect? For Sth-Eth-250 from Samsung: version not specified. The record lists 2 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2018-3856? Install the update the vendor names in its advisory. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2018-3856 affect you? EdgeProtect keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.edgeprotect.io/register Book a demo: https://www.edgeprotect.io/contact