Security vulnerabilities and automated fixes for input validation issues
19 posts found
A high-severity argument injection vulnerability was discovered in the Copilot tool bridge (`bridge.ts`) where user-controlled `request.args` were passed directly to `tool.execute()` without any validation or sanitization. The fix introduces Zod schema validation at line 108, ensuring that tool arguments are parsed against a declared `inputSchema` before execution. This prevents malformed or malicious payloads — including prototype pollution attempts — from reaching the underlying tool implement
A high-severity denial-of-service vulnerability was discovered in the PH7 lexer where the `PH7_TokenizePHP()` function accepted arbitrarily large input sizes without validation. An attacker could submit gigabyte-scale PHP code, causing proportional CPU and memory exhaustion. The fix introduces a configurable input size cap enforced before lexer processing begins.
A critical command injection vulnerability in the `luci.natflow` RPC handler allowed authenticated attackers to pass arbitrary shell metacharacters through the `kick_user`, `block_user`, and `allow_user` functions, which forwarded the unsanitized input directly to `sys.call()` as root. The fix adds a strict IPv4 regex validation pattern before any shell command is constructed, ensuring only legitimate IP addresses can reach the dangerous sink. This kind of targeted input allowlisting is the gold
A high-severity path traversal vulnerability was discovered in `tool/update-doc.py`, where user-controlled input was passed directly to Python's `open()` function without sanitization. This flaw could allow an attacker to read arbitrary files on the server by manipulating the file path. The fix ensures that file paths are validated and restricted to an intended directory before being opened.
A critical command injection vulnerability was discovered in `drivers/local/util.go` where user-influenced file paths were passed directly to `ffmpeg.Input()` without any sanitization. Because many ffmpeg wrapper libraries construct shell command strings under the hood, an attacker could embed shell metacharacters in a file path to execute arbitrary OS commands with server-level privileges. The fix introduces a `sanitizeFilePath()` function that validates paths are absolute, clean, and point to
A high-severity vulnerability was discovered in `lvl_script_commands.c` where the use of the non-reentrant `strtok()` function during level script parsing created conditions for memory corruption and potential arbitrary code execution. The fix replaces all `strtok()` calls with the thread-safe `strtok_r()` variant, eliminating shared global state that could be exploited through maliciously crafted level files. This change is part of a broader effort to harden the game's script parsing pipeline a
A high-severity configuration injection vulnerability was discovered in an HAProxy dashboard where five form fields were written directly into the HAProxy configuration file without any sanitization. An attacker could exploit this by injecting newline characters and arbitrary HAProxy directives, effectively rewriting load balancer rules, adding unauthorized backends, or bypassing access controls. The fix introduces a sanitization layer that strips non-printable characters from all user-supplied
A critical path traversal vulnerability in a ZMODEM file receiver allowed a malicious sender to supply crafted filenames containing directory traversal sequences (like `../../.ssh/authorized_keys`), causing the receiver to write file contents to arbitrary locations on the filesystem. The fix strips path separators and validates filenames before use, ensuring received files can only be written to the intended download directory. This class of vulnerability is a stark reminder that any input origi
A critical buffer overflow vulnerability was discovered in the RC device request parser (`rcdevice.c`), where incoming packet data was written to a fixed-size buffer using an attacker-controlled length field as the only guard. Because the expected data length was parsed directly from the packet without being validated against the actual allocated buffer size, a malicious packet could overflow the buffer and overwrite adjacent stack or heap memory with arbitrary bytes. The fix adds a single, esse
A high-severity Regular Expression Denial of Service (ReDoS) vulnerability was discovered and patched in Nushell's interactive TUI explorer, where unvalidated user keystrokes could be passed directly into regex compilation, allowing adversarial inputs to consume 100% CPU and freeze the interface. This fix adds proper input validation and length limits to the search input handler, preventing catastrophic backtracking attacks. Understanding this vulnerability is essential for any developer buildin
A medium-severity vulnerability in a file transfer receiver allowed attackers to exhaust server resources by sending maliciously crafted import files with no size limits, no JSON depth restrictions, and millions of entries loaded directly into memory. The fix introduces explicit input validation guards that reject unauthenticated or malformed requests before any disk or network operations begin. Understanding this class of vulnerability is essential for any developer building file ingestion pipe
A medium-severity vulnerability in a Rust file transfer receiver allowed a malicious peer to trigger a panic (crash) by sending a crafted length value exceeding the allocated buffer size. The fix adds an explicit bounds check that returns a graceful error instead of crashing, demonstrating that even Rust's memory safety guarantees don't automatically protect against all logic-level vulnerabilities. Understanding this class of bug is essential for developers building networked applications in any