alpine 3.6
tmpfile weakness #92

4

Weakness Breakdown


Definition:

A temporary file weakness occurs when a temporary file that is created and used by a high-privilege process is accidentally shared with a low-privilege process, on account of it being temporary and generated after all security controls have been applied. This allows the low-privilege process to read data from the high-privilege process (information leakage), or worse, influence the high-privilege process by modifying the shared temporary file.

Warning code(s):

Temporary file race condition.

File Name:

fontconfig/src/fontconfig-2.12.1/test/test-migration.c

Context:

The highlighted line of code below is the trigger point of this particular Alpine 3.6 tmpfile weakness.

  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <dirent.h>
#ifndef HAVE_STRUCT_DIRENT_D_TYPE
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#endif
#include <fontconfig/fontconfig.h>

#ifdef HAVE_MKDTEMP
#define fc_mkdtemp	mkdtemp
#else
char *
fc_mkdtemp (char *template)
{
    if (!mktemp (template) || mkdir (template, 0700))
	return NULL;

    return template;
}
#endif

FcBool
mkdir_p(const char *dir)
{
    char *parent;
    FcBool ret;

    if (strlen (dir) == 0)
	return FcFalse;
    parent = (char *) FcStrDirname ((const FcChar8 *)dir);
    if (!parent)
	return FcFalse;
    if (access (parent, F_OK) == 0)
	ret = mkdir (dir, 0755) == 0 && chmod (dir, 0755) == 0;
    else if (access (parent, F_OK) == -1)
	ret = mkdir_p (parent) && (mkdir (dir, 0755) == 0) && chmod (dir, 0755) == 0;
    else
	ret = FcFalse;
    free (parent);
 

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