SUSE SLED11 / SLES11 Security Update : openssh (SUSE-SU-2015:1695-1) (Logjam)

This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.


Synopsis :

The remote SUSE host is missing one or more security updates.

Description :

OpenSSH was updated to fix several security issues and bugs.

Please note that due to a bug in the previous shipped openssh version,
sshd might not correctly restart. Please verify that the ssh daemon is
running after installing this update.

These security issues were fixed :

- CVE-2015-5352: The x11_open_helper function, when
ForwardX11Trusted mode is not used, lacked a check of
the refusal deadline for X connections, which made it
easier for remote attackers to bypass intended access
restrictions via a connection outside of the permitted
time window. (bsc#936695)

- CVE-2015-5600: The kbdint_next_device function in
auth2-chall.c in sshd did not properly restrict the
processing of keyboard-interactive devices within a
single connection, which made it easier for remote
attackers to conduct brute-force attacks or cause a
denial of service (CPU consumption) via a long and
duplicative list in the ssh

-oKbdInteractiveDevices option, as demonstrated by a
modified client that provides a different password for
each pam element on this list. (bsc#938746)

- CVE-2015-4000: Removed and disabled weak DH groups to
address LOGJAM. (bsc#932483)

- Hardening patch to fix sftp RCE. (bsc#903649)

- CVE-2015-6563: The monitor component in sshd accepted
extraneous username data in MONITOR_REQ_PAM_INIT_CTX
requests, which allowed local users to conduct
impersonation attacks by leveraging any SSH login access
in conjunction with control of the sshd uid to send a
crafted MONITOR_REQ_PWNAM request, related to monitor.c
and monitor_wrap.c.

- CVE-2015-6564: Use-after-free vulnerability in the
mm_answer_pam_free_ctx function in monitor.c in sshd
might have allowed local users to gain privileges by
leveraging control of the sshd uid to send an
unexpectedly early MONITOR_REQ_PAM_FREE_CTX request.

Additional a bug was fixed that could lead to openssh not working in
chroot (bsc#947458).

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

See also :

https://bugzilla.suse.com/903649
https://bugzilla.suse.com/932483
https://bugzilla.suse.com/936695
https://bugzilla.suse.com/938746
https://bugzilla.suse.com/939932
https://bugzilla.suse.com/943006
https://bugzilla.suse.com/943010
https://bugzilla.suse.com/945484
https://bugzilla.suse.com/945493
https://bugzilla.suse.com/947458
https://www.suse.com/security/cve/CVE-2015-4000.html
https://www.suse.com/security/cve/CVE-2015-5352.html
https://www.suse.com/security/cve/CVE-2015-5600.html
https://www.suse.com/security/cve/CVE-2015-6563.html
https://www.suse.com/security/cve/CVE-2015-6564.html
http://www.nessus.org/u?a811b187

Solution :

To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Server 11-SP4 :

zypper in -t patch slessp4-openssh-12119=1

SUSE Linux Enterprise Desktop 11-SP4 :

zypper in -t patch sledsp4-openssh-12119=1

SUSE Linux Enterprise Debuginfo 11-SP4 :

zypper in -t patch dbgsp4-openssh-12119=1

To bring your system up-to-date, use 'zypper patch'.

Risk factor :

High / CVSS Base Score : 8.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:C)
CVSS Temporal Score : 7.0
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: SuSE Local Security Checks

Nessus Plugin ID: 86339 ()

Bugtraq ID: 74733
75525

CVE ID: CVE-2015-4000
CVE-2015-5352
CVE-2015-5600
CVE-2015-6563
CVE-2015-6564

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