SUSE-SU-2015:1547-2: moderate: Security update for openssh

[sle-security-updates at lists.suse.com]

   SUSE Security Update: Security update for openssh
______________________________________________________________________________

Announcement ID:    SUSE-SU-2015:1547-2
Rating:             moderate
References:         #673532 #903649 #905118 #914309 #916549 #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 Desktop 11-SP3
                    SUSE Linux Enterprise Debuginfo 11-SP3
______________________________________________________________________________

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

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 aesXXX-gcm at openssh.com.


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 Desktop 11-SP3:

      zypper in -t patch sledsp3-openssh-12087=1

   - SUSE Linux Enterprise Debuginfo 11-SP3:

      zypper in -t patch dbgsp3-openssh-12087=1

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


Package List:

   - SUSE Linux Enterprise Desktop 11-SP3 (i586 x86_64):

      openssh-6.2p2-0.17.1
      openssh-askpass-6.2p2-0.17.1
      openssh-askpass-gnome-6.2p2-0.17.3

   - SUSE Linux Enterprise Debuginfo 11-SP3 (i586 ia64 ppc64 s390x x86_64):

      openssh-askpass-gnome-debuginfo-6.2p2-0.17.3
      openssh-debuginfo-6.2p2-0.17.1
      openssh-debugsource-6.2p2-0.17.1


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/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