Security update for openssh

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
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):
      • openssh-6.6p1-13.1
      • openssh-askpass-gnome-6.6p1-13.3
      • openssh-fips-6.6p1-13.1
      • openssh-helpers-6.6p1-13.1
    • SUSE Linux Enterprise Desktop 11-SP4 (i586 x86_64):
      • openssh-6.6p1-13.1
      • openssh-askpass-gnome-6.6p1-13.3
      • openssh-helpers-6.6p1-13.1
    • SUSE Linux Enterprise Debuginfo 11-SP4 (i586 ia64 ppc64 s390x x86_64):
      • openssh-askpass-gnome-debuginfo-6.6p1-13.3
      • openssh-debuginfo-6.6p1-13.1
      • openssh-debugsource-6.6p1-13.1