NASI BSafe May Let Remote Users Bypass AS/400 FTP Access Controls
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SecurityTracker Alert ID: 1013808 |
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SecurityTracker URL: http://securitytracker.com/id/1013808
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Apr 26 2005
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Impact:
Host/resource access via network
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Exploit Included: Yes
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Description:
A vulnerability was reported in NASI BSafe. A remote authenticated user can bypass certain FTP access controls to access restricted AS/400 objects.
The software does not properly parse user-supplied requests in making access control decisions. As a result, a remote authenticated user can supply a specially crafted request to bypass BSafe FTP access restrictions and access potentially restricted files on the target AS/400 system.
Some demonstration exploit requests are provided:
Get /home/bp/outgoing/../../../qsys.lib/aplibf.lib/apcaccp.file/apcaccp.mbr
Get /home/bp/outgoing/./././../../bp/../../qsys.lib/aplibf.lib/apcaccp.file/apcaccp.mbr
The vendor was notified on March 2, 2005.
Shalom Carmel reported this vulnerability.
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Impact:
A remote authenticated user can bypass access restrictions and access potentially restricted files on the target AS/400 system.
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Solution:
No solution was available at the time of this entry.
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Vendor URL: www.nasi.com/BSafe.php (Links to External Site)
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Cause:
Access control error, Input validation error
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Underlying OS:
OS/400
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Message History:
None.
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Source Message Contents
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Date: Mon, 25 Apr 2005 21:24:05 -0400
Subject: http://www.venera.com/downloads/Canonicalization_problems_in_iSeries_FTP_security.pdf
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> Canonicalization problems in iSeries FTP security
> Several commercial iSeries security vendors were approached to see
> whether their products are vulnerable to this canonicalization attack.
> Raz Lee: notified on Feb 15, fix is available.
> Castlehill: notified on March 15, fix is available.
> Powertech: notified on March 15, fix is available.
> Bsafe: notified on March 2, vendor has no comment.
> SafeStone: notified on March 15, no reply received.
> NetIQ: notified on March 15, no reply received.
Some demonstration exploit requests are provided:
Get /home/bp/outgoing/../../../qsys.lib/aplibf.lib/
apcaccp.file/apcaccp.mbr
Get /home/bp/outgoing/./././../../bp/../../qsys.lib/aplibf.lib/
apcaccp.file/apcaccp.mbr
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