SUSE-SU-2018:3781-1: moderate: Security update for openssh

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

   SUSE Security Update: Security update for openssh
______________________________________________________________________________

Announcement ID:    SUSE-SU-2018:3781-1
Rating:             moderate
References:         #1091396 #1105010 #1106163 #964336 #982273 
                    
Cross-References:   CVE-2018-15473 CVE-2018-15919
Affected Products:
                    SUSE Linux Enterprise Server 11-SP4
                    SUSE Linux Enterprise Debuginfo 11-SP4
______________________________________________________________________________

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

Description:

   This update for openssh fixes the following issues:

   Following security issues have been fixed:

   - CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH
     could be used by remote attackers to detect existence of users on a
     target system when GSS2 is in use. OpenSSH developers do not want to
     treat such a username enumeration (or "oracle") as a vulnerability.
     (bsc#1106163)
   - CVE-2018-15473: OpenSSH was prone to a user existance oracle
     vulnerability due to not delaying bailout for an invalid authenticating
     user until after the packet containing the request has been fully
     parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.
     (bsc#1105010)

   Also the following security related hardening change was done:

   - Removed arcfour,blowfish,cast from list of default ciphers as they are
     long discontinued and should no longer be used. (bsc#982273)

   And the following non-security issues were fixed:

   - Stop leaking File descriptors (bsc#964336)
   - sftp-client.c returns wrong error code upon failure (bsc#1091396)


Patch Instructions:

   To install this SUSE Security Update use the SUSE recommended installation methods
   like YaST online_update or "zypper patch".

   Alternatively you can run the command listed for your product:

   - SUSE Linux Enterprise Server 11-SP4:

      zypper in -t patch slessp4-openssh-13867=1

   - SUSE Linux Enterprise Debuginfo 11-SP4:

      zypper in -t patch dbgsp4-openssh-13867=1



Package List:

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

      openssh-6.6p1-36.6.1
      openssh-askpass-gnome-6.6p1-36.6.1
      openssh-fips-6.6p1-36.6.1
      openssh-helpers-6.6p1-36.6.1

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

      openssh-askpass-gnome-debuginfo-6.6p1-36.6.1
      openssh-debuginfo-6.6p1-36.6.1
      openssh-debugsource-6.6p1-36.6.1


References:

   https://www.suse.com/security/cve/CVE-2018-15473.html
   https://www.suse.com/security/cve/CVE-2018-15919.html
   https://bugzilla.suse.com/1091396
   https://bugzilla.suse.com/1105010
   https://bugzilla.suse.com/1106163
   https://bugzilla.suse.com/964336
   https://bugzilla.suse.com/982273