Security vulnerabilities and automated fixes for heap exploitation issues
7 posts found
A high-severity vulnerability in `src/parser/koala.l` allowed an attacker to craft a malicious `.kl` source file that, when parsed by the Koala compiler, could trigger a chain of memory safety bugs — integer overflow, use-after-free, and out-of-bounds access — ultimately enabling arbitrary code execution at the privilege level of the compiler process. The fix introduces strict input validation guards that break this exploitation chain before it can begin. This is a reminder that parsers and comp
A critical heap buffer overflow vulnerability was discovered and patched in a vendored copy of `stb_image.h`, a popular single-header image loading library. The root cause was a missing bounds check that allowed attacker-controlled image data to trigger memory writes beyond allocated heap buffers, potentially enabling arbitrary code execution. A single defensive guard — rejecting negative buffer lengths before any memory operation — closes this dangerous attack vector.
A heap buffer overflow vulnerability in MAME's drawgfx.c allowed attackers to craft malicious ROM files with manipulated width/height values, causing memcpy to write beyond allocated buffer boundaries and potentially overwrite function pointers for arbitrary code execution. The fix introduces proper buffer-length validation before the copy operation, closing a dangerous attack vector that existed wherever untrusted ROM data controlled memory operations. Understanding this class of vulnerability
A critical heap buffer overflow vulnerability was discovered and patched in the NanoSVG SVG parsing library, where missing bounds checks on memcpy operations allowed attacker-controlled SVG data to overflow heap buffers. Without validation of gradient stop counts and attribute array indices, a specially crafted SVG file could trigger arbitrary code execution. The fix adds proper bounds checking before all memory copy operations, closing a dangerous attack vector present in any application that p
A critical heap buffer overflow vulnerability was discovered and patched in `src/ssl.c`, where improper bounds checking during ALPN/NPN protocol list construction could allow an attacker to corrupt heap memory and potentially execute arbitrary code. The fix addresses both the missing capacity validation and a dangerous integer overflow in size arithmetic that could lead to undersized allocations followed by out-of-bounds writes. Understanding this class of vulnerability is essential for any deve
A critical vulnerability chain discovered in `src/trie/trie.c` combines heap buffer overflows and use-after-free bugs into a complete process compromise exploit. By corrupting glibc memory allocator metadata, an attacker could hijack execution flow and achieve arbitrary code execution. This post breaks down how these primitives chain together and what developers can do to prevent similar issues.
A critical heap buffer overflow vulnerability was discovered and patched in a GeoIP database parser, where raw `memcpy` operations were performed without proper bounds validation across three separate code locations. An attacker who could supply a malicious GeoIP database file could potentially achieve arbitrary code execution or crash the application. The fix introduces strict bounds checking before every memory copy operation, eliminating the attack surface entirely.