[Patches] [ python-Patches-703471 ] (Security Problem) base64.decodestring exposes garbage value

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Patches item #703471, was opened at 2003-03-14 03:18
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=305470&aid=703471&group_id=5470

Category: Library (Lib)
Group: Python 2.3
Status: Open
Resolution: None
>Priority: 8
Submitted By: Hye-Shik Chang (perky)
Assigned to: Nobody/Anonymous (nobody)
Summary: (Security Problem) base64.decodestring exposes garbage value

Initial Comment:
>>> import base64
>>> base64.decodestring("###################")
'\x0cD\x1a\x08\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
>>> base64.decodestring(".....")
'ps2\x00\x00t'
>>> base64.decodestring("........................")
'\x0cF\x1a\x08\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
>>>
base64.decodestring(".................................................")
'.............................."\x00\x00\x00\x00\x00\x00\x00\x00'

This exposes unexpected values that deallocated recently.
(some my cgi script showed garbage that contains a
database password in offensive query)


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>Comment By: Tim Peters (tim_one)
Date: 2003-03-14 10:19

Message:
Logged In: YES 
user_id=31435

Yikes!  Boosted priority way up.  A quick check shows that 
my Python 2.2.2 also appears to "decode" free'd RAM here 
on Windows.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=305470&aid=703471&group_id=5470