Quantum Secular Labs / Blog / Advisories

CVE-2019-3929: Crestron Multiple Products Command Injection Vulnerability

CVE-2019-3929 is rated critical with a CVSS v3.1 base score of 9.8 and affects Crestron Multiple Products, along with 5 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available. CISA added it to its Known Exploited Vulnerabilities catalog on 2022-04-15, which means exploitation in the wild has been observed.

Vulnerability 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 command injection via the file_transfer.cgi HTTP endpoint. A remote, unauthenticated attacker can use this vulnerability to execute operating system commands as root.

Severity breakdown

CVSS v3.1 9.8: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-79: Improper Neutralization of Input During Web Page Generation

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

CWE-78: Improper Neutralization of Special Elements used in an OS Command

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component.

Affected products

  • Crestron Am 100 Firmware: 1.6.0.2
  • Crestron Am 101 Firmware: 2.7.0.2
  • Barco Wepresent Wipg 1000p Firmware: 2.3.0.10
  • Teqavit Wips710 Firmware: 1.1.0.7
  • Sharp Pn L703wa Firmware: 1.4.2.3
  • Optoma Wps Pro Firmware: 1.0.0.5
  • Infocus Liteshow3 Firmware: 1.0.16
  • Barco Wepresent Wipg 1600w Firmware: before 2.4.1.19
  • Extron Sharelink 200 Firmware: 2.0.3.4
  • Extron Sharelink 250 Firmware: 2.0.3.4
  • Blackbox Hd Wireless Presentation System Firmware: 1.0.0.5
  • Infocus Liteshow4 Firmware: 2.0.0.7

References