SUSE-SU-2015:1544-1: moderate: Security update for openssh

[sle-updates at lists.suse.com]

   SUSE Security Update: Security update for openssh
______________________________________________________________________________

Announcement ID:    SUSE-SU-2015:1544-1
Rating:             moderate
References:         #903649 #932483 #936695 #938746 #943006 #943010 
                    
Cross-References:   CVE-2015-4000 CVE-2015-5352 CVE-2015-5600
                    CVE-2015-6563 CVE-2015-6564
Affected Products:
                    SUSE Linux Enterprise Server 12
                    SUSE Linux Enterprise Desktop 12
______________________________________________________________________________

   An update that solves 5 vulnerabilities and has one errata
   is now available.

Description:


   openssh was updated to fix several security issues.

   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. (bsc#943010)
   * 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.
     (bsc#943006)

   Also use %restart_on_update in the trigger script.


Patch Instructions:

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

   - SUSE Linux Enterprise Server 12:

      zypper in -t patch SUSE-SLE-SERVER-12-2015-526=1

   - SUSE Linux Enterprise Desktop 12:

      zypper in -t patch SUSE-SLE-DESKTOP-12-2015-526=1

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


Package List:

   - SUSE Linux Enterprise Server 12 (ppc64le s390x x86_64):

      openssh-6.6p1-29.1
      openssh-askpass-gnome-6.6p1-29.1
      openssh-askpass-gnome-debuginfo-6.6p1-29.1
      openssh-debuginfo-6.6p1-29.1
      openssh-debugsource-6.6p1-29.1
      openssh-fips-6.6p1-29.1
      openssh-helpers-6.6p1-29.1
      openssh-helpers-debuginfo-6.6p1-29.1

   - SUSE Linux Enterprise Desktop 12 (x86_64):

      openssh-6.6p1-29.1
      openssh-askpass-gnome-6.6p1-29.1
      openssh-askpass-gnome-debuginfo-6.6p1-29.1
      openssh-debuginfo-6.6p1-29.1
      openssh-debugsource-6.6p1-29.1
      openssh-helpers-6.6p1-29.1
      openssh-helpers-debuginfo-6.6p1-29.1


References:

   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
   https://bugzilla.suse.com/903649
   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