SUSE SLED11 / SLES11 Security Update : openssh (SUSE-SU-2015:1581-1) (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.

These security issues were fixed :

- CVE-2015-5352: The x11_open_helper function in
channels.c in ssh in OpenSSH 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 in OpenSSH 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 in OpenSSH
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 in
OpenSSH 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.

These non-security issues were fixed :

- bsc#914309: sshd inherits oom_adj -17 on SIGHUP causing
DoS potential for oom_killer.

- bsc#673532: limits.conf fsize change in SLES10SP3
causing problems to WebSphere mqm user.

- bsc#916549: Fixed support for [email protected]

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/673532
https://bugzilla.suse.com/903649
https://bugzilla.suse.com/905118
https://bugzilla.suse.com/914309
https://bugzilla.suse.com/916549
https://bugzilla.suse.com/932483
https://bugzilla.suse.com/936695
https://bugzilla.suse.com/938746
https://bugzilla.suse.com/943006
https://bugzilla.suse.com/943010
https://bugzilla.suse.com/945493
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?b348f297

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 for VMWare 11-SP3 :

zypper in -t patch slessp3-openssh-12096=1

SUSE Linux Enterprise Server 11-SP3 :

zypper in -t patch slessp3-openssh-12096=1

SUSE Linux Enterprise Desktop 11-SP3 :

zypper in -t patch sledsp3-openssh-12096=1

SUSE Linux Enterprise Debuginfo 11-SP3 :

zypper in -t patch dbgsp3-openssh-12096=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: 86057 ()

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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