[Devel] [ openser-Bugs-1620701 ] Buffer overflow by long lines in permissions

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Bugs item #1620701, was opened at 2006-12-22 11:50
Message generated for change (Comment added) made by bogdan_iancu
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Category: modules
Group: None
Status: Open
Resolution: Fixed
Priority: 5
Private: No
Submitted By: Bastian Friedrich (bastian)
Assigned to: Bogdan (bogdan_iancu)
Summary: Buffer overflow by long lines in permissions

Initial Comment:
Hi,

today a bug in OpenSER was reported on bugtraq (not found by me!):
http://www.securityfocus.com/archive/1/455097/30/0/threaded

String lengths are not properly checked in parse_expression_list (modules/permissions/parse_config.c) while copying from input variable str (up to 500 chars) to str2 (up to 100 chars).

I can reproduce the problem by using a line like
ALLLLLLL (500 L's) : ALLLLLLL (another 500 L's) in a permission file.

As the configuration file is under administrative control, no security breach is directly implied.

Best,
   Bastian


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>Comment By: Bogdan (bogdan_iancu)
Date: 2007-01-04 21:04

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Hi Bastian,

I run more tests and I found a bug in matching the "ALL" keyword - all
string starting with "ALL" were matching :(.....
So, if you were using the ALLLLL (250 L), it will never try to parse as
list as the string was considered "ALL"....

try now....at least it works for me.

thanks and regards,
bogdan

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Comment By: Bastian Friedrich (bastian)
Date: 2007-01-04 20:28

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Hi Bogdan,

looks good (although I wonder why I'm not able to trigger the "Expression
too long" warning...?! :)

Thx,
  Bastian

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Comment By: Bogdan (bogdan_iancu)
Date: 2007-01-04 19:45

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Hi Bastian,

I have just committed a patch for fixing this problem. Could you please
give it a try to see if it works? if everything ok, I will make a backport
to 1.1.0.

thanks and regards,
bogdan

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Comment By: Bogdan (bogdan_iancu)
Date: 2006-12-22 13:35

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Hi Bastian,

actually is more than this - there are also no check when copying from
file to the line buffer (500 chars max). Looks like there is a lot of work
to be done there.

Thanks for report - we will take care of it.

regards,
bogdan

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