centos 6
buffer weakness #18

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-4.3.29/tcl/tcl_db.c

Context:

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

 		{ DB_CREATE, "-create" },
		{ DB_DEGREE_2, "-degree_2" },
		{ DB_DIRTY_READ, "-dirty" },
		{ DB_EXCL, "-excl" },
		{ DB_NOMMAP, "-nommap" },
		{ DB_RDONLY, "-rdonly" },
		{ DB_THREAD, "-thread" },
		{ DB_TRUNCATE, "-truncate" },
		{ 0, NULL }
	};

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

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

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

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

	return (result);
}

/*
 * tcl_DbCount --
 */
static int
tcl_DbCount(interp, objc, objv, dbp)
	Tcl_Interp *interp;		/* Interpreter */
	int objc;			/* How many arguments? */
	Tcl_Obj *CONST objv[];		/* The argument objects */
	DB *dbp;			/* Database pointer */
{
	Tcl_Obj *res;
	DBC *dbc;
	DBT key, data;
	void *ktmp; 

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