6073 : OpenSSH on FreeBSD libutil Arbitrary File Read
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
14	671	over 8 years ago	over 4 years ago	0 times	90%

Timeline

Disclosure Date	Exploit Publish Date
2001-09-20	2001-09-20

Description

OpenSSH on FreeBSD platforms contains a flaw that may lead to an unauthorized information disclosure. The issue is triggered when the user sets welcome or copyright file parameters to system-sensitive files in their login.conf, which will disclose the contents of those files to that user, resulting in a loss of confidentiality.

Classification

Location: Local Access Required
Attack Type: Information Disclosure, Input Manipulation, Misconfiguration
Impact: Loss of Confidentiality
Exploit: Exploit Public
Disclosure: OSVDB Verified

Technical

OpenSSH's libutil fails to correctly drop privileges before interacting with the login class capability database. This is especially problematically coded in session.c, as this error allows users to read ANY file in system with superuser privileges by defining either of:

default:\
:copyright=/etc/master.passwd:
:welcome=/etc/master.passwd:

in the user's ~/.login_conf. (Substitute the file of your choice for /etc/master.passwd, although that would obviously be a popular choice.)

Solution

Upgrade to version 4.4-RELEASE or higher, as it has been reported to fix this vulnerability. It is also possible to correct the flaw by applying the vendor-supplied patch.

Products

FreeBSD Project	FreeBSD	3.x
		4.0x
		4.1x
		4.2x
		4.3x
		4.4-RC

References

CVE ID: 2001-1029 (see also: NVD)
Bugtraq ID: 8697
Mail List Post: http://archives.neohapsis.com/archives/bugtraq/2001-09/0173.html
http://cert.uni-stuttgart.de/archive/bugtraq/2001/09/msg00223.html

Credit

Przemyslaw Frasunek - venglinfreebsd.lublin.pl - Przemyslaw Frasunek

CVSSv2 Score

CVSSv2 Base Score = 2.1
Source: nvd.nist.gov | Generated: 2003-12-31 | Disagree?

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