[asterisk-bugs] [Asterisk 0015271]: [patch] BASE64_DECODE() adds garbage end end of decoded string

[Asterisk Bug Tracker]

The following issue has been UPDATED. 
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https://issues.asterisk.org/view.php?id=15271 
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Reported By:                chappell
Assigned To:                mnicholson
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Project:                    Asterisk
Issue ID:                   15271
Category:                   Functions/func_base64
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     closed
Target Version:             1.4.28
Asterisk Version:           SVN 
JIRA:                       SWP-265 
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
Resolution:                 fixed
Fixed in Version:           
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Date Submitted:             2009-06-04 10:16 CDT
Last Modified:              2009-11-10 16:22 CST
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Summary:                    [patch] BASE64_DECODE() adds garbage end end of
decoded string
Description: 
This problem has two causes:

1) BASE64_DECODE() fails to null terminate its return value. This becomes
evident if first a long string is decoded and then a short one.  The short
one will have have the last part of the long string appended to it.

2) What is more, ast_base64decode() does not recognize the equals signs
which pad the end of a string the length of which is not a multiple of
three bytes. Rather than stopping, it decodes the padding as data,
producing bogus output.  
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Relationships       ID      Summary
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related to          0011018 patch for 10979 breaks IAX RSA auth
related to          0010979 [path] main/util.c missed *dst='\0'; in...
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Issue History 
Date Modified    Username       Field                    Change               
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2009-11-10 16:22 lmadsen        Asterisk Version         1.4.24 => SVN       
2009-11-10 16:22 lmadsen        Target Version            => 1.4.28          
2009-11-10 16:22 lmadsen        Description Updated                          
2009-11-10 16:22 lmadsen        Additional Information Updated                  
 
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