Security update for openssh

SUSE Security Update: Security update for openssh
Announcement ID: SUSE-SU-2015:1840-1
Rating: moderate
References: #673532 #903649 #905118 #914309 #932483 #936695 #938746
Affected Products:
  • SUSE Linux Enterprise Server 11-SP2-LTSS
    		•

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

    Description:

    openssh was updated to fix four 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 (bsc#932483).
    - Hardening patch to fix sftp RCE (bsc#903649).

    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.

    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-SP2-LTSS:
      zypper in -t patch slessp2-openssh-12168=1

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

    Package List:

    • SUSE Linux Enterprise Server 11-SP2-LTSS (i586 s390x x86_64):
      • openssh-5.1p1-41.69.1
      • openssh-askpass-5.1p1-41.69.1
      • openssh-askpass-gnome-5.1p1-41.69.4

    References: