SB2021062306 - Multiple vulnerabilities in CODESYS V2 web server
Published: June 23, 2021 Updated: September 18, 2023
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 secuirty vulnerabilities.
1) Stack-based buffer overflow (CVE-ID: CVE-2021-30189)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
2) Improper access control (CVE-ID: CVE-2021-30190)
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions in the user management. A remote attacker can use a specially crafted web server request to bypass user management and read or write values on the PLC without authentication.
3) Buffer overflow (CVE-ID: CVE-2021-30191)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.
4) Improperly implemented security check for standard (CVE-ID: CVE-2021-30192)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to improperly implemented security check. A remote attacker can use a specially crafted web server request to bypass the security checks for boot project-related files.
5) Out-of-bounds write (CVE-ID: CVE-2021-30193)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input. A remote attacker can use a specially crafted web server request, trigger out-of-bounds write and execute arbitrary code on the target system.
6) Out-of-bounds read (CVE-ID: CVE-2021-30194)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to a boundary condition. A remote attacker can trigger out-of-bounds read error and read contents of memory on the system or perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.