alpine 3.6
access weakness #222


Weakness Breakdown


An access weakness occurs when software does not properly implement permissions that could have unintended consequences if exploited by malicious actors. An example of this weakness is when a default username and password are set by the developer but do not get changed by the system administrator.

Warning code(s):

Ensure that umask is given most restrictive possible setting.

File Name:



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


sink (int argc, char *argv[])
  static BUF buffer;
  struct stat stb;
  struct timeval tv[2];
  { YES, NO, DISPLAYED } wrerr;
  BUF *bp;
  off_t i, j;
  int amt, count, exists, first, mask, mode, ofd, omode;
  int setimes, size, targisdir, wrerrno;
  char ch, *cp, *np, *targ, *vect[1], buf[BUFSIZ];
  const char *why;

#define atime	tv[0]
#define mtime	tv[1]
#define SCREWUP(str)	{ why = str; goto screwup; }

  setimes = targisdir = 0;
  mask = umask (0);
  if (!preserve_option)
    umask (mask);
  if (argc != 1)
      run_err ("ambiguous target");
      exit (EXIT_FAILURE);
  targ = *argv;
  if (targetshouldbedirectory)
    verifydir (targ);
  write (rem, "", 1);
  if (stat (targ, &stb) == 0 && S_ISDIR (stb.st_mode))
    targisdir = 1;
  for (first = 1;; first = 0)
      cp = buf;
      if (read (rem, cp, 1) <= 0)
      if (*cp++ == '\n')
	SCREWUP ("unexpected <newline>");
	  if (read (rem, &ch, sizeof ch) != sizeof ch)
	    SCREWUP ("lost connection");
	  *cp++ = ch;
      while (cp < &buf[BUFSIZ - 1] && ch != '\n'); 

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