Vulnerability CVE-2016-1908
Published: 2017-04-11

Description:
The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server.

Type:

CWE-254

 (Security Features)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Openbsd -> Openssh 

 References:
http://openwall.com/lists/oss-security/2016/01/15/13
http://rhn.redhat.com/errata/RHSA-2016-0465.html
http://rhn.redhat.com/errata/RHSA-2016-0741.html
http://www.openssh.com/txt/release-7.2
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
http://www.securityfocus.com/bid/84427
http://www.securitytracker.com/id/1034705
https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416c
https://bugzilla.redhat.com/show_bug.cgi?id=1298741
https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
https://security.gentoo.org/glsa/201612-18
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