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* cons.saver.c (check_file): close fd on error. There was a bug, which

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allowed luser to write '\0' char to any symlinkable file in Linux
system which don't ensure that fd's 0, 1, and 2 are open on startup
of a SUID/SGID binary.

Based on patch from bugtrack by Maurycy Prodeus <z33d@ETH-SECURITY.NET>.
This commit is contained in:
Andrew V. Samoilov 2000-11-16 17:09:08 +00:00
parent 1e575f7011
commit 1cc4f6be7a
2 changed files with 40 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/ChangeLog
View File

@ -1,3 +1,11 @@
2000-11-16 Andrew V. Samoilov <sav@bcs.zp.ua>
* cons.saver.c (check_file): close fd on error. There was a bug, which
allowed luser to write '\0' char to any symlinkable file in Linux
system which don't ensure that fd's 0, 1, and 2 are open on startup
of a SUID/SGID binary.
Based on patch from bugtrack by Maurycy Prodeus <z33d@ETH-SECURITY.NET>.
2000-11-14 Andrew V. Samoilov <sav@bcs.zp.ua>
* layout.c (print_vfs_message): format string vulnerability fixed

59
src/cons.saver.c
View File

@ -42,6 +42,7 @@
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h> /* For isdigit() */
#include <string.h>
typedef struct WINDOW WINDOW;
#include "cons.saver.h"
@ -116,39 +117,43 @@ int check_file (char *filename, int check_console, char **msg)
if (fd == -1)
return -1;
if (fstat (fd, &stat_buf) == -1)
return -1;
do {
if (fstat (fd, &stat_buf) == -1)
break;
/* Must be character device */
if (!S_ISCHR (stat_buf.st_mode)){
*msg = "Not a character device";
return -1;
}
/* Must be character device */
if (!S_ISCHR (stat_buf.st_mode)){
*msg = "Not a character device";
break;
}
#ifdef DEBUG
fprintf (stderr, "Device: %x\n", stat_buf.st_rdev);
fprintf (stderr, "Device: %x\n", stat_buf.st_rdev);
#endif
if (check_console){
/* Second time: must be console */
if ((stat_buf.st_rdev & 0xff00) != 0x0400){
*msg = "Not a console";
return -1;
if (check_console){
/* Second time: must be console */
if ((stat_buf.st_rdev & 0xff00) != 0x0400){
*msg = "Not a console";
break;
}
if ((stat_buf.st_rdev & 0x00ff) > 63){
*msg = "Minor device number too big";
break;
}
/* Must be owned by the user */
if (stat_buf.st_uid != getuid ()){
*msg = "Not a owner";
break;
}
}
if ((stat_buf.st_rdev & 0x00ff) > 63){
*msg = "Minor device number too big";
return -1;
}
/* Must be owned by the user */
if (stat_buf.st_uid != getuid ()){
*msg = "Not a owner";
return -1;
}
}
/* Everything seems to be okay */
return fd;
return fd;
} while (0);
close (fd);
return -1;
}
/* Detect console */