Out-of-bounds read in Siemens products - CVE-2021-31885

Vulnerability identifier: #VU58085

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-31885

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition. A remote attacker can send specially crafted TFTP commands, trigger out-of-bounds read error and read contents of memory on the system.

Nucleus NET
Nucleus Source Code
Capital VSTAR
Nucleus ReadyStart
APOGEE MBC (PPC) (BACnet)
APOGEE MBC (PPC) (P2 Ethernet)
APOGEE MEC (PPC) (BACnet)
APOGEE MEC (PPC) (P2 Ethernet)
APOGEE PXC Compact (BACnet)
APOGEE PXC Compact (P2 Ethernet)
APOGEE PXC Modular (BACnet)
APOGEE PXC Modular (P2 Ethernet)
TALON TC Compact (BACnet)
TALON TC Modular (BACnet)
PLUSCONTROL 1st Gen

Install updates from vendor's website.

Nucleus ReadyStart - addressed in versions 4.1.1, 2017.02.4

• https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf

• Multiple vulnerabilities in Siemens Nucleus RTOS TCP/IP Stack
• Multiple vulnerabilities in Siemens APOGEE and TALON Products
• Multiple vulnerabilities in Siemens PLUSCONTROL 1st Gen