Bug 1298033 (CVE-2016-0778) - CVE-2016-0778 OpenSSH: Client buffer-overflow when using roaming connections
Summary: CVE-2016-0778 OpenSSH: Client buffer-overflow when using roaming connections
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2016-0778
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1298217 1298218 1298630 1298817 1298818
Blocks: 1298034
TreeView+ depends on / blocked
 
Reported: 2016-01-13 04:06 UTC by Huzaifa S. Sidhpurwala
Modified: 2023-05-12 16:49 UTC (History)
12 users (show)

Fixed In Version: openssh 7.1p2
Doc Type: Bug Fix
Doc Text:
A buffer overflow flaw was found in the way the OpenSSH client roaming feature was implemented. A malicious server could potentially use this flaw to execute arbitrary code on a successfully authenticated OpenSSH client if that client used certain non-default configuration options.
Clone Of:
Environment:
Last Closed: 2016-01-14 20:54:34 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Article) 2123781 0 None None None 2016-01-15 06:42:19 UTC
Red Hat Knowledge Base (Solution) 2126451 0 None None None 2016-01-15 06:42:41 UTC
Red Hat Product Errata RHSA-2016:0043 0 normal SHIPPED_LIVE Moderate: openssh security update 2016-01-15 01:20:12 UTC

Description Huzaifa S. Sidhpurwala 2016-01-13 04:06:52 UTC 
A buffer-overflow was found in the way OpenSSH client handled roaming connections. This buffer overflow, is present in the default configuration of the OpenSSH client but its exploitation requires two non-default options: a ProxyCommand, and either ForwardAgent (-A) or ForwardX11 (-X).

This buffer-overflow is not exploitable in the default configuration of OpenSSH package shipped with Red Hat Enterprise Linux.
Comment 2 Martin Prpič 2016-01-14 09:40:06 UTC 
Acknowledgements:

Red Hat would like to thank Qualys for reporting this issue.
Comment 3 Martin Prpič 2016-01-14 15:20:48 UTC 
Created openssh tracking bugs for this issue:

Affects: fedora-all [bug 1298630]
Comment 4 Martin Prpič 2016-01-14 15:22:03 UTC 
Public now via upstream release 7.1p2:

http://www.openssh.com/txt/release-7.1p2
Comment 5 Martin Prpič 2016-01-14 17:33:41 UTC 
A detailed analysis of this issue was published by Qualys at:

https://www.qualys.com/2016/01/14/cve-2016-0777-cve-2016-0778/openssh-cve-2016-0777-cve-2016-0778.txt
Comment 6 Tomas Hoger 2016-01-14 19:14:41 UTC 
External References:

http://www.openssh.com/txt/release-7.1p2
https://www.qualys.com/2016/01/14/cve-2016-0777-cve-2016-0778/openssh-cve-2016-0777-cve-2016-0778.txt
Comment 7 errata-xmlrpc 2016-01-14 20:21:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:0043 https://rhn.redhat.com/errata/RHSA-2016-0043.html
Comment 8 Tomas Hoger 2016-01-15 07:43:29 UTC 
Created gsi-openssh tracking bugs for this issue:

Affects: fedora-all [bug 1298817]
Affects: epel-7 [bug 1298818]
Comment 9 Fedora Update System 2016-01-29 00:21:50 UTC 
gsi-openssh-7.1p2-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 10 Fedora Update System 2016-02-01 06:32:35 UTC 
gsi-openssh-6.9p1-7.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Comment 11 Fedora Update System 2016-02-04 21:56:11 UTC 
gsi-openssh-6.6.1p1-3.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.
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