centos 6
buffer weakness #19

5

Weakness Breakdown


Definition:

Buffer overflows are one of the most well-known software vulnerabilities. Even though most developers know what buffer overflows are, attacks against the vulnerabilities are common in both legacy and newer applications. A classic buffer overflow exploit begins with the attacker sending data to a program, which it then stores in an undersized stack buffer. Besides stack buffer overflows, other kinds of buffer overflows include heap overflows, off-by-one errors and many others. Learn more about buffer overflows on OWASP attack index.

Warning code(s):

Easily used incorrectly.

File Name:

compat-db-4.6.21/db-4.2.52/tcl/tcl_env.c

Context:

The highlighted line of code below is the trigger point of this particular Centos 6 buffer weakness.

 	Tcl_Obj *res;

	static const struct {
		u_int32_t flag;
		char *arg;
	} encrypt_flags[] = {
		{ DB_ENCRYPT_AES, "-encryptaes" },
		{ 0, NULL }
	};

	if (objc != 2) {
		Tcl_WrongNumArgs(interp, 1, objv, NULL);
		return (TCL_ERROR);
	}

	ret = dbenv->get_encrypt_flags(dbenv, &flags);
	if ((result = _ReturnSetup(interp, ret, DB_RETOK_STD(ret),
	    "env get_encrypt_flags")) == TCL_OK) {
		buf[0] = '\0';

		for (i = 0; encrypt_flags[i].flag != 0; i++)
			if (LF_ISSET(encrypt_flags[i].flag)) {
				if (strlen(buf) > 0)
					strncat(buf, " ", sizeof(buf));
				strncat(buf, encrypt_flags[i].arg, sizeof(buf));
			}

		res = Tcl_NewStringObj(buf, strlen(buf));
		Tcl_SetObjResult(interp, res);
	}

	return (result);
}

/*
 * env_GetLockDetect --
 *	Implements the ENV->get_lk_detect command.
 */
static int
env_GetLockDetect(interp, objc, objv, dbenv)
	Tcl_Interp *interp;		/* Interpreter */
	int objc;			/* How many arguments? */
	Tcl_Obj *CONST objv[];		/* The argument objects */
	DB_ENV *dbenv;
{
	int i, ret, result;
	u_int32_t lk_detect;
	const char *answer;
	Tcl_Obj *res;
	static const struct { 

The registered trademark Linux® is used pursuant to a sublicense from the Linux Foundation, the exclusive licensee of Linus Torvalds, owner of the mark on a world­wide basis.