A stack buffer overflow vulnerability exists in the Wincor Nixdorf wnBios64.sys kernel driver (version 1.2.0.0) in the IOCTL handler for code 0x80102058. The vulnerability is caused by missing bounds checking on the user-controlled Options parameter before copying data into a 40-byte stack buffer (Src[40]) using memmove. An attacker with local access can exploit this vulnerability by sending a crafted IOCTL request with Options > 40, causing a stack buffer overflow that may lead to kernel code execution, local privilege escalation, or denial of service (system crash). Additionally, the same IOCTL handler can leak kernel addresses and other sensitive stack data when reading beyond the buffer boundaries.

Diebold Nixdorf Vynamic Security Suite through 4.3.0 SR01 does not validate file attributes or the contents of /root during integrity validation. This allows code execution, recovery of TPM Disk Encryption keys, decryption of the Windows system partition, and full control of the Windows OS, e.g., through ~/.profile changes.

Diebold Nixdorf Vynamic Security Suite through 4.3.0 SR06 contains functionality that allows the removal of critical system files before the filesystem is properly mounted (e.g., leveraging a delete call in /etc/rc.d/init.d/mountfs to remove the /etc/fstab file). This can allow code execution and, in some versions, enable recovery of TPM Disk Encryption keys and decryption of the Windows system partition.

Diebold Nixdorf Vynamic Security Suite (VSS) before 3.3.0 SR17, 4.0.0 SR07, 4.1.0 SR04, 4.2.0 SR04, and 4.3.0 SR02 fails to validate file attributes during the Pre-Boot Authorization (PBA) process. This can be exploited by a physical attacker who is able to manipulate the contents of the system's hard disk.

Diebold Nixdorf Vynamic Security Suite (VSS) before 3.3.0 SR16, 4.0.0 SR06, 4.1.0 SR04, 4.2.0 SR03, and 4.3.0 SR01 fails to validate symlinks during the Pre-Boot Authorization (PBA) process. This can be exploited by a physical attacker who is able to manipulate the contents of the system's hard disk.

Diebold Nixdorf Vynamic Security Suite (VSS) before 3.3.0 SR15, 4.0.0 SR05, 4.1.0 SR03, and 4.2.0 SR02 fails to validate the directory contents of certain directories (e.g., ensuring the expected hash sum) during the Pre-Boot Authorization (PBA) process. This can be exploited by a physical attacker who is able to manipulate the contents of the system's hard disk.

Diebold Nixdorf Vynamic Security Suite (VSS) before 3.3.0 SR4 fails to validate /etc/initab during the Pre-Boot Authorization (PBA) process. This can be exploited by a physical attacker who is able to manipulate the contents of the system's hard disk.

Diebold Nixdorf Vynamic Security Suite (VSS) before 3.3.0 SR10 fails to validate /etc/mtab during the Pre-Boot Authorization (PBA) process. This can be exploited by a physical attacker who is able to manipulate the contents of the system's hard disk.

Diebold Nixdorf Vynamic Security Suite (VSS) before 3.3.0 SR12, 4.0.0 SR04, 4.1.0 SR02, and 4.2.0 SR01 fails to validate the directory structure of the root file system during the Pre-Boot Authorization (PBA) process. This can be exploited by a physical attacker who is able to manipulate the contents of the system's hard disk.

An issue in Diebold Aglis XFS for Opteva v.4.1.61.1 allows a remote attacker to execute arbitrary code via a crafted payload to the ResolveMethod() parameter.

An issue in Diebold Nixdorf Vynamic View Console v.5.3.1 and before allows a local attacker to execute arbitrary code via not restricting the search path for required DLLs and not verifying the signature.

Diebold Nixdorf ProCash 2100xe USB ATMs running Wincor Probase version 1.1.30 do not encrypt, authenticate, or verify the integrity of messages between the CCDM and the host computer, allowing an attacker with physical access to internal ATM components to commit deposit forgery by intercepting and modifying messages to the host computer, such as the amount and value of currency being deposited.