20263 : SUSE Permissions Bypass chkstat Arbitrary File Access
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Info

Last Modified
10 months ago

Percent Complete
100%

Disclosure
Oct 24, 2005

Discovery
Unknown

Dates

Exploit
Oct 24, 2005

Solution
Unknown

Description

 SUSE LINUX's permissions package contains a flaw that may lead to an unauthorized access control bypass. The issue is triggered when a malicious user creates a hardlink in certain world-writable directories before chkstat is run. chkstat will then set the target file with the permissions intended for the original file, resulting in a loss of confidentiality.

Classification

 Location: Local Access Required
Attack Type: Information Disclosure
Impact: Loss of Confidentiality
Exploit: Exploit Available
Disclosure: OSVDB Verified

Technical

 With the default settings, the attacker should only be able to make files world readable. If an administrator has edited /etc/permissions.easy, then it may be possible to make arbitrary files world writable as well.

Solution

 SUSE has released a patch to address this vulnerability. It is also possible to correct the flaw by implementing the following workaround(s): Switch to the permission level 'secure' or 'paranoid' before any potentially malicious users can log in. Only the 'easy' level is vulnerable.

Products
Novell, Inc.
Watch-list
SUSE LINUX
Watch-list
 9.0
9.1
9.2
9.3
10.0
SuSE Linux Desktop
Watch-list
 1.0
SuSE Linux Enterprise Server
Watch-list
 8
9
UnitedLinux
Watch-list
 1.0

References

Credit
  • Stefan Nordhausen - nordhausBrand New Doo Dooinformatik.hu-berlin.de -

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