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securityvulnsSecurityvulnsSECURITYVULNS:DOC:16351
HistoryMar 14, 2007 - 12:00 a.m.

[Full-disclosure] Python 2.5 (Modules/zlib) minigzip local buffer overflow vulnerability

2007-03-1400:00:00
vulners.com
8

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