<<< Date Index >>>     <<< Thread Index >>>

Fwd: Python 2.5 (Modules/zlib) minigzip local buffer overflow vulnerability

Description:

The source of python contain a various modules, the zlib module
contain a minigzip tool, ( * minigzip is a minimal implementation of
the gzip utility.  ).

Source error:

the error was found in:
- void file_compress(file, mode)
because the use of strcpy() is inapropriatly

--
#define MAX_NAME_LEN 1024
[..]
void file_compress(file, mode)
   char  *file;
     char  *mode;
{
   local char outfile[MAX_NAME_LEN];
   FILE  *in;
   gzFile out;

     strcpy(outfile, file);
   strcat(outfile, GZ_SUFFIX);
 --

the function file_compress() was called by main() function.

Proof of concept:

if you want test the vulnerability try:
$ minigzip `perl -e "print 'A'x1050"`

-- starcadi