M-054: OpenSSH Contains Remote Exploitable Vulnerability
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INFORMATION BULLETIN
M-054: OpenSSH Contains Remotely Exploitable Vulnerability
[Pine Internet Security Advisory 20020301]
March 7, 2002 18:00 GMT
|
| PROBLEM: |
A remotely exploitable vulnerability has been identified
in the channel code of OpenSSH.
|
| PLATFORM: |
All platforms using OpenSSH versions prior to version 3.1.
|
| DAMAGE: |
Users with an existing account could upgrade privileges,
up to and including root. Exploitability without an existing user account
has not been proven but is not considered impossible. A malicious ssh
server could also use this vulnerability to exploit a connecting vulnerable
client.
|
| SOLUTION: |
CIAC recommends that you upgrade to version 3.1 or apply
the included patch.
|
|
VULNERABILITY
ASSESSMENT: |
The risk is MEDIUM. Exploitability without an existing
user account has not been proven.
|
|
[***** Start Pine Internet Security Advisory 20020301 *****]
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Pine Internet Security Advisory
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Advisory ID : PINE-CERT-20020301
Authors : Joost Pol
Issue date : 2002-03-07
Application : OpenSSH
Version(s) : All versions between 2.0 and 3.0.2
Platforms : multiple
Vendor informed : 20020304
Availability : http://www.pine.nl/advisories/pine-cert-20020301.txt
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Synopsis
A bug exists in the channel code of OpenSSH versions 2.0 - 3.0.2
Users with an existing user account can abuse this bug to
gain root privileges. Exploitability without an existing
user account has not been proven but is not considered
impossible. A malicious ssh server could also use this bug
to exploit a connecting vulnerable client.
Impact
HIGH: Existing users will gain root privileges.
Description
Simple off by one error. Patch included.
Solution
The OpenSSH project will shortly release version 3.1.
Upgrading to this version is highly recommended.
This version will be made available at http://www.openssh.com
The FreeBSD port of OpenSSH has been updated to reflect the
patches as supplied in this document.
OpenSSH CVS has been updated, see
OpenBSD cvs entry for channels.c
Or apply the attached patch as provided by PINE Internet:
http://www.pine.nl/advisories/pine-cert-20020301.patch
[***** End Pine Internet Security Advisory 20020301 *****]
CIAC wishes to acknowledge the contributions of Pine CERT for the
information contained in this bulletin.
CIAC services are available to DOE, DOE Contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 925-422-8193 (7 x 24)
FAX: +1 925-423-8002
STU-III: +1 925-423-2604
E-mail: ciac@ciac.org
World Wide Web: http://www.ciac.org/
Anonymous FTP: ftp.ciac.org
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
owned rights. Reference herein to any specific commercial products,
process, or service by trade name, trademark, manufacturer, or
otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
advertising or product endorsement purposes.
UCRL-MI-119788
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