ESB-2018.3591 - [SUSE] openssh: Access confidential data - Remote/unauthenticated 2018-11-19

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3591
                        Security update for openssh
                             19 November 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           openssh
Publisher:         SUSE
Operating System:  SUSE
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-15919 CVE-2018-15473 

Reference:         ESB-2018.3570
                   ESB-2018.3520
                   ESB-2018.3326

Original Bulletin: 
   https://www.suse.com/support/update/announcement/2018/suse-su-20183781-1/
   https://www.suse.com/support/update/announcement/2018/suse-su-20183776-1/

Comment: This bulletin contains two (2) security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

   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

______________________________________________________________________________

   SUSE Security Update: Security update for openssh
______________________________________________________________________________

Announcement ID:    SUSE-SU-2018:3776-1
Rating:             moderate
References:         #1091396 #1105010 #1106163 #964336 #982273 
                    
Cross-References:   CVE-2018-15473 CVE-2018-15919
Affected Products:
                    SUSE Linux Enterprise Server 12-SP1-LTSS
                    SUSE Linux Enterprise Server 12-LTSS
______________________________________________________________________________

   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:

   - Remove arcfour,cast,blowfish from list of default ciphers. (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 12-SP1-LTSS:

      zypper in -t patch SUSE-SLE-SERVER-12-SP1-2018-2698=1

   - SUSE Linux Enterprise Server 12-LTSS:

      zypper in -t patch SUSE-SLE-SERVER-12-2018-2698=1



Package List:

   - SUSE Linux Enterprise Server 12-SP1-LTSS (ppc64le s390x x86_64):

      openssh-6.6p1-54.18.1
      openssh-askpass-gnome-6.6p1-54.18.1
      openssh-askpass-gnome-debuginfo-6.6p1-54.18.1
      openssh-debuginfo-6.6p1-54.18.1
      openssh-debugsource-6.6p1-54.18.1
      openssh-fips-6.6p1-54.18.1
      openssh-helpers-6.6p1-54.18.1
      openssh-helpers-debuginfo-6.6p1-54.18.1

   - SUSE Linux Enterprise Server 12-LTSS (ppc64le s390x x86_64):

      openssh-6.6p1-54.18.1
      openssh-askpass-gnome-6.6p1-54.18.1
      openssh-askpass-gnome-debuginfo-6.6p1-54.18.1
      openssh-debuginfo-6.6p1-54.18.1
      openssh-debugsource-6.6p1-54.18.1
      openssh-fips-6.6p1-54.18.1
      openssh-helpers-6.6p1-54.18.1
      openssh-helpers-debuginfo-6.6p1-54.18.1


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

- --------------------------END INCLUDED TEXT--------------------

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