Bug 134640 – CAN-2004-0882 unicode parsing overflow

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Bug 134640 - CAN-2004-0882 unicode parsing overflow

Summary:	CAN-2004-0882 unicode parsing overflow

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 3
Classification:	Red Hat
Component:	samba (Show other bugs)
Sub Component:
Version:	3.0
Hardware:	All Linux

Priority	medium Severity high
Target Milestone:	---
Target Release:	---
Assigned To:	Jay Fenlason
QA Contact:	David Lawrence
Docs Contact:

URL:
Whiteboard:	impact=important,embargo=20041115
Keywords:	Security

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2004-10-05 08:01 EDT by Mark J. Cox
Modified:	2014-08-31 19:26 EDT (History)
CC List:	2 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2004-11-16 12:37:56 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2004:632	high	SHIPPED_LIVE	Important: samba security update	2004-11-16 00:00:00 EST

Groups: None (edit)

Description Mark J. Cox 2004-10-05 08:01:33 EDT

Stefan Esser reported to vendor-sec on Sep27 a possible remote flaw in
call_trans2qfilepathinfo().   In 3.x the unicode complete filename is
copied into the packet. This will overflow the allocated memory on
longer filenames.

Samba team believe this is just a remote DoS

Embargo date currently not set.

Comment 1 Mark J. Cox 2004-11-12 04:33:02 EST

Stefan Esser has proved this allows arbitrary code execution.  Embargo
set to 20041115.

> the bug:
>
> trans2.c - static int call_trans2qfilepathinfo(connection_struct *conn,
>
>  data_size = max_data_bytes + 1024;
>  pdata = Realloc(*ppdata, data_size);
>
> max_data_bytes from client is trusted. Can f.e. be 0
> In 2.x this was no problem because only the dos8name was
> copied into the packet. (which was wrong)
>
> In 3.x the unicode complete filename is copied into the
> packet. This will overflow the allocated memory on longer
> filenames.

http://websvn.samba.org/cgi-bin/viewcvs.cgi/trunk/source/smbd/trans2.c?rev=2636&r1=2197&r2=2636

> The use of the new constant  #define DIR_ENTRY_SAFETY_MARGIN 4096
> fixes the problem.

Comment 2 Mark J. Cox 2004-11-12 04:39:26 EST

Verified fixed by RHSA-2004:632 in progress.

Comment 3 Mark J. Cox 2004-11-15 04:11:08 EST

Now public.

Comment 4 Josh Bressers 2004-11-16 11:01:08 EST

This issue does affect RHEL2.1.

Comment 5 Josh Bressers 2004-11-16 12:37:56 EST

An errata has been issued which should help the problem 
described in this bug report. This report is therefore being 
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files, 
please follow the link below. You may reopen this bug report 
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2004-632.html

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