centos 7
format weakness #25

4

Weakness Breakdown


Definition:

A format string exploit occurs when the data of an input string is evaluated as a command by the program. This class of attacks is very similar to buffer overflows since an attacker could execute code, read the stack or cause new behaviors that compromise security. Learn more about format string attacks on OWASP attack index.

Warning code(s):

If format strings can be influenced by an attacker, they can be exploited.

File Name:

libusbmuxd-1.0.10/src/libusbmuxd.c

Context:

The highlighted line of code below is the trigger point of this particular Centos 7 format weakness.

 #define EVENT_BUF_LEN (1024 * (EVENT_SIZE + 16))
#define USBMUXD_DIRNAME "/var/run"
#define USBMUXD_SOCKET_NAME "usbmuxd"
#endif /* HAVE_INOTIFY */

#include <unistd.h>
#include <signal.h>

#include <plist/plist.h>
#define PLIST_BUNDLE_ID "org.libimobiledevice.usbmuxd"
#define PLIST_CLIENT_VERSION_STRING "usbmuxd built for freedom"
#define PLIST_PROGNAME "libusbmuxd"
#define PLIST_LIBUSBMUX_VERSION 3

// usbmuxd public interface
#include "usbmuxd.h"
// usbmuxd protocol
#include "usbmuxd-proto.h"
// socket utility functions
#include "socket.h"
// misc utility functions
#include "collection.h"

static int libusbmuxd_debug = 0;
#define DEBUG(x, y, ...) if (x <= libusbmuxd_debug) fprintf(stderr, (y), __VA_ARGS__); fflush(stderr);

static struct collection devices;
static usbmuxd_event_cb_t event_cb = NULL;
#ifdef WIN32
HANDLE devmon = NULL;
#else
pthread_t devmon;
#endif
static int listenfd = -1;

static volatile int use_tag = 0;
static volatile int proto_version = 1;
static volatile int try_list_devices = 1;

/**
 * Finds a device info record by its handle.
 * if the record is not found, NULL is returned.
 */
static usbmuxd_device_info_t *devices_find(uint32_t handle)
{
	FOREACH(usbmuxd_device_info_t *dev, &devices) {
		if (dev && dev->handle == handle) {
			return dev;
		}
	} ENDFOREACH 

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