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