The x11_open_helper function in channels.c in ssh in OpenSSH before 6.9, when ForwardX11Trusted mode is not used, lacks a check of the refusal deadline for X connections, which makes it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openssh | Openbsd | * | 6.8 (including) |
| Red Hat Enterprise Linux 6 | RedHat | openssh-0:5.3p1-117.el6 | * |
| Openssh | Ubuntu | devel | * |
| Openssh | Ubuntu | esm-infra-legacy/trusty | * |
| Openssh | Ubuntu | precise | * |
| Openssh | Ubuntu | trusty | * |
| Openssh | Ubuntu | trusty/esm | * |
| Openssh | Ubuntu | upstream | * |
| Openssh | Ubuntu | utopic | * |
| Openssh | Ubuntu | vivid | * |
| Openssh | Ubuntu | vivid/stable-phone-overlay | * |
| Openssh | Ubuntu | vivid/ubuntu-core | * |
References
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
- http://openwall.com/lists/oss-security/2015/07/01/10
- http://rhn.redhat.com/errata/RHSA-2016-0741.html
- http://www.openssh.com/txt/release-6.9
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://www.securityfocus.com/bid/75525
- http://www.securitytracker.com/id/1032797
- http://www.ubuntu.com/usn/USN-2710-1
- http://www.ubuntu.com/usn/USN-2710-2
- https://anongit.mindrot.org/openssh.git/commit/?h=V_6_9\u0026id=1bf477d3cdf1a864646d59820878783d42357a1d
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
- https://security.gentoo.org/glsa/201512-04
- https://security.netapp.com/advisory/ntap-20181023-0001/
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
- http://openwall.com/lists/oss-security/2015/07/01/10
- http://rhn.redhat.com/errata/RHSA-2016-0741.html
- http://www.openssh.com/txt/release-6.9
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://www.securityfocus.com/bid/75525
- http://www.securitytracker.com/id/1032797
- http://www.ubuntu.com/usn/USN-2710-1
- http://www.ubuntu.com/usn/USN-2710-2
- https://anongit.mindrot.org/openssh.git/commit/?h=V_6_9\u0026id=1bf477d3cdf1a864646d59820878783d42357a1d
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
- https://security.gentoo.org/glsa/201512-04
- https://security.netapp.com/advisory/ntap-20181023-0001/