SUSE-SU-2015:1695-1: moderate: Security update for openssh

sle-security-updates at sle-security-updates at
Wed Oct 7 10:11:20 MDT 2015

   SUSE Security Update: Security update for openssh

Announcement ID:    SUSE-SU-2015:1695-1
Rating:             moderate
References:         #903649 #932483 #936695 #938746 #939932 #943006 
                    #943010 #945484 #945493 #947458 
Cross-References:   CVE-2015-4000 CVE-2015-5352 CVE-2015-5600
                    CVE-2015-6563 CVE-2015-6564
Affected Products:
                    SUSE Linux Enterprise Server 11-SP4
                    SUSE Linux Enterprise Desktop 11-SP4
                    SUSE Linux Enterprise Debuginfo 11-SP4

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


   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.

   * 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.

   * CVE-2015-4000: Removed and disabled weak DH groups to address LOGJAM.

   * 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).

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 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".

Package List:

   - SUSE Linux Enterprise Server 11-SP4 (i586 ia64 ppc64 s390x x86_64):


   - SUSE Linux Enterprise Desktop 11-SP4 (i586 x86_64):


   - SUSE Linux Enterprise Debuginfo 11-SP4 (i586 ia64 ppc64 s390x x86_64):



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