Security vulnerabilities and automated fixes for memcpy issues
11 posts found
A critical buffer overflow vulnerability was discovered in the nanosvg.h SVG parser where the `memcpy` call at line 913 copies gradient stop data using an attacker-controlled size (`nstops`) without validating buffer boundaries. A crafted SVG file with excessive `<stop>` elements could trigger heap corruption, potentially enabling arbitrary code execution. The fix adds a bounds check before the `memcpy` operation to prevent writes when no valid stops exist.
A critical buffer overflow vulnerability was discovered in `src/script_engine/core/script_engine_core.c` at line 392, where `memcpy` copied an error message into a buffer without validating the source length against any maximum. The fix introduces a length cap of 4096 bytes and ensures proper null-termination, preventing heap corruption and potential remote code execution through crafted script error messages.
A critical buffer overflow vulnerability was discovered in `modxo/modxo_queue.c`, where two `memcpy` operations in the `modxo_queue_insert` and `modxo_queue_remove` functions used `queue->item_size` as the copy length without validating it against the destination buffer's bounds. If `item_size` was corrupted or maliciously set to an oversized value, both the enqueue (line 49) and dequeue (line 61) operations could overflow adjacent heap or stack memory on the embedded target. The fix adds bounds
A critical out-of-bounds read vulnerability was discovered in `hep-tester/heptester.c` where `memcpy` calls at lines 200-201 read from fixed offsets in a packet buffer without verifying the buffer was large enough. An attacker could send a crafted packet shorter than 18 bytes to trigger the read, potentially leaking memory contents or crashing the capture agent. The fix adds a single bounds check against `pkthdr->caplen` before any memory copy operations.
A critical buffer overflow vulnerability was discovered in RapidSpeech's `audio_processor.cpp`, where multiple `memcpy` calls used externally-influenced size parameters without validating destination buffer capacity. An attacker supplying crafted audio or model input could trigger out-of-bounds memory writes, potentially leading to crashes, memory corruption, or arbitrary code execution. The fix introduces explicit bounds checking before each copy operation, ensuring offsets never exceed allocat
A high-severity vulnerability in ESP32 firmware allowed attackers to trigger stack and heap corruption by sending malformed UART frames shorter than expected to an mmWave sensor driver. Multiple `memcpy` operations copied data into fixed-size local variables without first verifying the source buffer was large enough, opening the door to arbitrary code execution. The fix replaces magic-number length guards with `sizeof()`-based checks that are portable, self-documenting, and provably correct.
A critical buffer overflow vulnerability was discovered and patched in `common/scanner.h`, where serialization macros wrote scanner state data into caller-supplied buffers without validating available capacity. Left unpatched, a crafted input could corrupt adjacent heap memory, potentially enabling remote code execution or application crashes. This post breaks down how the vulnerability worked, how it was fixed, and what every C/C++ developer should know to avoid similar pitfalls.
A critical heap buffer overflow vulnerability was discovered and patched in `src/opkit_compile.c`, where multiple `memcpy` calls copied user-controlled data into heap-allocated buffers without verifying destination buffer sizes. Left unpatched, this flaw could allow attackers to overwrite heap metadata or function pointers, potentially achieving arbitrary code execution. The fix ensures proper bounds checking before all memory copy operations.
A critical heap buffer overflow vulnerability was discovered and patched in a C++ speech-to-text component, where unchecked `memcpy` calls at lines 122, 152, and 580 allowed attacker-controlled input to corrupt adjacent heap memory. This class of vulnerability can enable remote code execution, privilege escalation, or application crashes — making it one of the most dangerous bugs a C++ developer can introduce. The fix enforces explicit bounds validation before every memory copy operation, closin
A critical buffer overflow vulnerability was discovered and patched in matfunc.c, where three memcpy calls used unvalidated, user-influenced lengths that could write beyond allocated buffer boundaries. If exploited, an attacker supplying maliciously crafted matrix dimensions could corrupt adjacent heap or stack memory, potentially leading to arbitrary code execution. The fix adds proper bounds validation before each copy operation, closing a dangerous attack surface.
A critical buffer overflow vulnerability was discovered and patched in opencstl.h, where multiple memcpy operations blindly trusted caller-supplied length parameters without verifying destination buffer capacity. Left unpatched, attackers could exploit oversized type strings or manipulated size calculations to corrupt heap memory, potentially achieving remote code execution or privilege escalation. This post breaks down how the vulnerability works, how it was fixed, and what every C/C++ develope