Security vulnerabilities and automated fixes for emulation issues
3 posts found
A medium-severity vulnerability in `src/ddma.c` allowed a malicious guest OS to program DMA controllers with unconstrained transfer sizes and addresses, potentially enabling guest-to-host memory access in an emulated environment. The fix introduces strict bounds validation to ensure all DMA transfers stay within allocated memory regions, closing a dangerous path to host memory disclosure and corruption.
A critical out-of-bounds memory read vulnerability was discovered and patched in a RISC-V emulator's MMU address translation logic, where insufficient bounds validation in `mmu_ifetch` allowed malicious guest programs to read arbitrary host process memory. This class of vulnerability represents one of the most dangerous bugs in virtualization and emulation software, as it breaks the fundamental isolation boundary between guest and host. The fix reinforces address validation before any memory acc
A critical buffer overflow vulnerability was discovered and patched in a NES emulator's port abstraction layer, where caller-supplied sizes were passed directly to memcpy without any bounds checking. This systemic flaw affected every supported platform port — SDL3, SDL2, RT-Thread, and the default port — meaning a crafted NES ROM could corrupt heap or stack memory across all targets. The fix introduces proper bounds validation before memory copy operations, closing a dangerous attack vector that