# What is CVE-2019-3930? > CVE-2019-3930 is a critical-severity flaw (CVSS 9.8) in Am-100 Firmware from Crestron, published on 30 April 2019. 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 7.0%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2019-3930 ## 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. - **Precursor Intelligence risk score:** 61 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** Critical (CVSS 9.8 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:** 7.0% (latest exploit-likelihood forecast) - **Published:** 30 April 2019 - **Record last updated:** 16 October 2020 - **Main product:** Am-100 Firmware from Crestron - **Affected products:** 24 ## What is CVE-2019-3930? In plain terms It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### The official description The Crestron AM-100 firmware 1.6.0.2, Crestron AM-101 firmware 2.7.0.1, Barco wePresent WiPG-1000P firmware 2.3.0.10, Barco wePresent WiPG-1600W before firmware 2.4.1.19, Extron ShareLink 200/250 firmware 2.0.3.4, Teq AV IT WIPS710 firmware 1.1.0.7, SHARP PN-L703WA firmware 1.4.2.3, Optoma WPS-Pro firmware 1.0.0.5, Blackbox HD WPS firmware 1.0.0.5, InFocus LiteShow3 firmware 1.0.16, and InFocus LiteShow4 2.0.0.7 are vulnerable to a stack buffer overflow in libAwgCgi.so's PARSERtoCHAR function. A remote, unauthenticated attacker can use this vulnerability to execute arbitrary code as root via a crafted request to the return.cgi endpoint. ### What kind of flaw is it? - CWE-787: Out-of-bounds Write - CWE-121: Stack-based Buffer Overflow ### 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: No login needed - 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:N/UI:N/S:U/C:H/I:H/A:H` ## Is CVE-2019-3930 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 7.0%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 7.0%, 7.0%, 7.0%, 7.0%, 7.0%, 7.0%, 7.0%. ### Timeline - 30 April 2019: Published - 16 October 2020: Record last updated ### How Precursor Intelligence ranks it CVE-2019-3930 scores **61 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: smaller factor - Threat activity around it: smaller factor 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-2019-3930? The published record lists 24 products. Versions are as published: "before 2.4.1.19" means every version up to, but not including, 2.4.1.19. - [Am-100 Firmware](https://www.precursorintelligence.com/product/crestron/am-100_firmware) by [Crestron](https://www.precursorintelligence.com/vendors/crestron) (Operating system): 1.6.0.2 - [Am-100](https://www.precursorintelligence.com/product/crestron/am-100) by [Crestron](https://www.precursorintelligence.com/vendors/crestron) (Hardware): version not specified - [Am-101](https://www.precursorintelligence.com/product/crestron/am-101) by [Crestron](https://www.precursorintelligence.com/vendors/crestron) (Hardware): version not specified - [Am-101 Firmware](https://www.precursorintelligence.com/product/crestron/am-101_firmware) by [Crestron](https://www.precursorintelligence.com/vendors/crestron) (Operating system): 2.7.0.2 - [Hd Wireless Presentation System](https://www.precursorintelligence.com/product/blackbox/hd_wireless_presentation_system) by [Blackbox](https://www.precursorintelligence.com/vendors/blackbox) (Hardware): version not specified - [Hd Wireless Presentation System Firmware](https://www.precursorintelligence.com/product/blackbox/hd_wireless_presentation_system_firmware) by [Blackbox](https://www.precursorintelligence.com/vendors/blackbox) (Operating system): 1.0.0.5 - [Liteshow3](https://www.precursorintelligence.com/product/infocus/liteshow3) by [Infocus](https://www.precursorintelligence.com/vendors/infocus) (Hardware): version not specified - [Liteshow3 Firmware](https://www.precursorintelligence.com/product/infocus/liteshow3_firmware) by [Infocus](https://www.precursorintelligence.com/vendors/infocus) (Operating system): 1.0.16 - [Liteshow4](https://www.precursorintelligence.com/product/infocus/liteshow4) by [Infocus](https://www.precursorintelligence.com/vendors/infocus) (Hardware): version not specified - [Liteshow4 Firmware](https://www.precursorintelligence.com/product/infocus/liteshow4_firmware) by [Infocus](https://www.precursorintelligence.com/vendors/infocus) (Operating system): 2.0.0.7 - [Pn-L703wa](https://www.precursorintelligence.com/product/sharp/pn-l703wa) by [Sharp](https://www.precursorintelligence.com/vendors/sharp) (Hardware): version not specified - [Pn-L703wa Firmware](https://www.precursorintelligence.com/product/sharp/pn-l703wa_firmware) by [Sharp](https://www.precursorintelligence.com/vendors/sharp) (Operating system): 1.4.2.3 - [Sharelink 200](https://www.precursorintelligence.com/product/extron/sharelink_200) by [Extron](https://www.precursorintelligence.com/vendors/extron) (Hardware): version not specified - [Sharelink 200 Firmware](https://www.precursorintelligence.com/product/extron/sharelink_200_firmware) by [Extron](https://www.precursorintelligence.com/vendors/extron) (Operating system): 2.0.3.4 - [Sharelink 250](https://www.precursorintelligence.com/product/extron/sharelink_250) by [Extron](https://www.precursorintelligence.com/vendors/extron) (Hardware): version not specified - [Sharelink 250 Firmware](https://www.precursorintelligence.com/product/extron/sharelink_250_firmware) by [Extron](https://www.precursorintelligence.com/vendors/extron) (Operating system): 2.0.3.4 - [Wepresent Wipg-1000p](https://www.precursorintelligence.com/product/barco/wepresent_wipg-1000p) by [Barco](https://www.precursorintelligence.com/vendors/barco) (Hardware): version not specified - [Wepresent Wipg-1000p Firmware](https://www.precursorintelligence.com/product/barco/wepresent_wipg-1000p_firmware) by [Barco](https://www.precursorintelligence.com/vendors/barco) (Operating system): 2.3.0.10 - [Wepresent Wipg-1600w](https://www.precursorintelligence.com/product/barco/wepresent_wipg-1600w) by [Barco](https://www.precursorintelligence.com/vendors/barco) (Hardware): version not specified - [Wepresent Wipg-1600w Firmware](https://www.precursorintelligence.com/product/barco/wepresent_wipg-1600w_firmware) by [Barco](https://www.precursorintelligence.com/vendors/barco) (Operating system): before 2.4.1.19 - [Wips710](https://www.precursorintelligence.com/product/teqavit/wips710) by [Teqavit](https://www.precursorintelligence.com/vendors/teqavit) (Hardware): version not specified - [Wips710 Firmware](https://www.precursorintelligence.com/product/teqavit/wips710_firmware) by [Teqavit](https://www.precursorintelligence.com/vendors/teqavit) (Operating system): 1.1.0.7 - [Wps-Pro](https://www.precursorintelligence.com/product/optoma/wps-pro) by [Optoma](https://www.precursorintelligence.com/vendors/optoma) (Hardware): version not specified - [Wps-Pro Firmware](https://www.precursorintelligence.com/product/optoma/wps-pro_firmware) by [Optoma](https://www.precursorintelligence.com/vendors/optoma) (Operating system): 1.0.0.5 ## How do I fix CVE-2019-3930? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence 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 - [tenable.com](https://www.tenable.com/security/research/tra-2019-20) (Exploit, Third-party advisory) ## Questions ### What is CVE-2019-3930? CVE-2019-3930 is a critical-severity flaw in Am-100 Firmware from Crestron, published on 30 April 2019. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data, change data and take it offline. ### How serious is CVE-2019-3930? It scores 9.8 out of 10 on the CVSS severity scale, which is critical. Our risk score for CVE-2019-3930 is 61 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-2019-3930 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 7.0%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2019-3930 affect? For Am-100 Firmware from Crestron: 1.6.0.2. The record lists 24 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2019-3930? 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-2019-3930 affect you? Precursor Intelligence 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.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact