CVE-2016-1908

critical
New! CVE Severity Now Using CVSS v3

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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

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

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

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:openbsd:openssh:*:p2:*:*:*:*:*:* versions up to 7.1 (inclusive)

Tenable Plugins

View all (22 total)

IDNameProductFamilySeverity
701160OpenSSH < 7.2 Input Validation ErrorNessus Network MonitorSSH
critical
127415NewStart CGSL MAIN 4.05 : openssh-latest Multiple Vulnerabilities (NS-SA-2019-0146)NessusNewStart CGSL Local Security Checks
high
99771EulerOS 2.0 SP1 : openssh (EulerOS-SA-2016-1008)NessusHuawei Local Security Checks
critical
95604GLSA-201612-18 : OpenSSH: Multiple vulnerabilitiesNessusGentoo Local Security Checks
critical
93735SUSE SLES11 Security Update : openssh (SUSE-SU-2016:2388-1)NessusSuSE Local Security Checks
critical
91655SUSE SLES11 Security Update : openssh (SUSE-SU-2016:1528-1)NessusSuSE Local Security Checks
critical
91540Scientific Linux Security Update : openssh on SL6.x i386/x86_64 (20160510)NessusScientific Linux Local Security Checks
critical
91413openSUSE Security Update : openssh (openSUSE-2016-668)NessusSuSE Local Security Checks
critical
91318SUSE SLED12 / SLES12 Security Update : openssh (SUSE-SU-2016:1386-1)NessusSuSE Local Security Checks
critical
91166CentOS 6 : openssh (CESA-2016:0741)NessusCentOS Local Security Checks
critical
91148Oracle Linux 6 : openssh (ELSA-2016-0741)NessusOracle Linux Local Security Checks
critical
91086Ubuntu 12.04 LTS / 14.04 LTS / 15.10 : openssh vulnerabilities (USN-2966-1)NessusUbuntu Local Security Checks
critical
91073RHEL 6 : openssh (RHSA-2016:0741)NessusRed Hat Local Security Checks
critical
90942AIX OpenSSH Advisory : openssh_advisory8.ascNessusAIX Local Security Checks
medium
9311OpenSSH < 7.2 X11Forwarding Fallback Bypass VulnerabilityNessus Network MonitorSSH
medium
90268Amazon Linux AMI : openssh (ALAS-2016-675)NessusAmazon Linux Local Security Checks
critical
90081Scientific Linux Security Update : openssh on SL7.x x86_64 (20160321)NessusScientific Linux Local Security Checks
critical
90078RHEL 7 : openssh (RHSA-2016:0465)NessusRed Hat Local Security Checks
critical
90074Oracle Linux 7 : openssh (ELSA-2016-0465)NessusOracle Linux Local Security Checks
critical
90068CentOS 7 : openssh (CESA-2016:0465)NessusCentOS Local Security Checks
critical
90022OpenSSH < 7.2 Untrusted X11 Forwarding Fallback Security BypassNessusMisc.
critical
89528Fedora 23 : gsi-openssh-7.1p2-3.fc23 (2016-4509765b4b)NessusFedora Local Security Checks
critical