CVE-2016-1908

HIGH

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.

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

Details

Source: MITRE

Published: 2017-04-11

Updated: 2018-09-11

Type: CWE-254

Risk Information

CVSS v2.0

Base Score: 7.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 10

Severity: HIGH

CVSS v3.0

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 3.9

Severity: CRITICAL