Bug 1298033 – CVE-2016-0778 OpenSSH: Client buffer-overflow when using roaming connections

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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

Status:	CLOSED ERRATA

Aliases:	CVE-2016-0778

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20160114,reported=2...
Keywords:	Security

Depends On:	1298217 1298218 1298630 1298817 1298818
Blocks:	1298034
	Show dependency tree / graph

Reported:	2016-01-12 23:06 EST by Huzaifa S. Sidhpurwala
Modified:	2016-02-09 03:25 EST (History)
CC List:	12 users (show)

See Also:
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.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-01-14 15:54:34 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Knowledge Base (Solution)	2126451	None	None	None	2016-01-15 01:42 EST
Red Hat Knowledge Base (Article)	2123781	None	None	None	2016-01-15 01:42 EST
Red Hat Product Errata	RHSA-2016:0043	normal	SHIPPED_LIVE	Moderate: openssh security update	2016-01-14 20:20:12 EST

Groups: None (edit)

Description Huzaifa S. Sidhpurwala 2016-01-12 23:06:52 EST

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 04:40:06 EST

Acknowledgements:

Red Hat would like to thank Qualys for reporting this issue.

Comment 3 Martin Prpič 2016-01-14 10:20:48 EST

Created openssh tracking bugs for this issue:

Affects: fedora-all [bug 1298630]

Comment 4 Martin Prpič 2016-01-14 10:22:03 EST

Public now via upstream release 7.1p2:

http://www.openssh.com/txt/release-7.1p2

Comment 5 Martin Prpič 2016-01-14 12:33:41 EST

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 14:14:41 EST

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 15:21:08 EST

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 02:43:29 EST

Created gsi-openssh tracking bugs for this issue:

Affects: fedora-all [bug 1298817]
Affects: epel-7 [bug 1298818]

Comment 9 Fedora Update System 2016-01-28 19:21:50 EST

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 01:32:35 EST

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 16:56:11 EST

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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