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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.0362
             SUSE-SU-2020:0266-1 Security update for tigervnc
                              31 January 2020

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

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

Product:           tigervnc
Publisher:         SUSE
Operating System:  SUSE
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Denial of Service               -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-15695 CVE-2019-15694 CVE-2019-15693
                   CVE-2019-15692 CVE-2019-15691 

Reference:         ESB-2020.0236
                   ESB-2020.0176

Original Bulletin: 
   https://www.suse.com/support/update/announcement/2020/suse-su-20200266-1.html

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SUSE Security Update: Security update for tigervnc

______________________________________________________________________________

Announcement ID:   SUSE-SU-2020:0266-1
Rating:            important
References:        #1041847 #1053373 #1159856 #1159858 #1159860 #1160250
                   #1160251 #1160937
Cross-References:  CVE-2019-15691 CVE-2019-15692 CVE-2019-15693 CVE-2019-15694
                   CVE-2019-15695
Affected Products:
                   SUSE Linux Enterprise Server for SAP 12-SP1
                   SUSE Linux Enterprise Server 12-SP1-LTSS
______________________________________________________________________________

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

Description:

This update for tigervnc provides the following fixes:
Security issues fixed:

  o CVE-2019-15691: Fixed a use-after-return due to incorrect usage of stack
    memory in ZRLEDecoder (bsc#1159856).
  o CVE-2019-15692: Fixed a heap-based buffer overflow in CopyRectDecode (bsc#
    1160250).
  o CVE-2019-15693: Fixed a heap-based buffer overflow in
    TightDecoder::FilterGradient (bsc#1159858).
  o CVE-2019-15694: Fixed a heap-based buffer overflow, caused by improper
    error handling in processing MemOutStream (bsc#1160251).
  o CVE-2019-15695: Fixed a stack-based buffer overflow, which could be
    triggered from CMsgReader::readSetCursor (bsc#1159860).


Non-security issue fixed:

  o Make sure CN in generated certificate doesn't exceed 64 characters. (bnc#
    1041847)
  o Change with-vnc-key.sh to generate TLS certificate using current hostname
    to keep it short. (bsc#1041847)
  o Disable MIT-SHM extension when running under user "vnc". (bsc#1053373)

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:

  o SUSE Linux Enterprise Server for SAP 12-SP1:
    zypper in -t patch SUSE-SLE-SAP-12-SP1-2020-266=1
  o SUSE Linux Enterprise Server 12-SP1-LTSS:
    zypper in -t patch SUSE-SLE-SERVER-12-SP1-2020-266=1

Package List:

  o SUSE Linux Enterprise Server for SAP 12-SP1 (x86_64):
       tigervnc-1.4.3-25.11.1
       tigervnc-debuginfo-1.4.3-25.11.1
       tigervnc-debugsource-1.4.3-25.11.1
       xorg-x11-Xvnc-1.4.3-25.11.1
       xorg-x11-Xvnc-debuginfo-1.4.3-25.11.1
  o SUSE Linux Enterprise Server 12-SP1-LTSS (ppc64le s390x x86_64):
       tigervnc-1.4.3-25.11.1
       tigervnc-debuginfo-1.4.3-25.11.1
       tigervnc-debugsource-1.4.3-25.11.1
       xorg-x11-Xvnc-1.4.3-25.11.1
       xorg-x11-Xvnc-debuginfo-1.4.3-25.11.1


References:

  o https://www.suse.com/security/cve/CVE-2019-15691.html
  o https://www.suse.com/security/cve/CVE-2019-15692.html
  o https://www.suse.com/security/cve/CVE-2019-15693.html
  o https://www.suse.com/security/cve/CVE-2019-15694.html
  o https://www.suse.com/security/cve/CVE-2019-15695.html
  o https://bugzilla.suse.com/1041847
  o https://bugzilla.suse.com/1053373
  o https://bugzilla.suse.com/1159856
  o https://bugzilla.suse.com/1159858
  o https://bugzilla.suse.com/1159860
  o https://bugzilla.suse.com/1160250
  o https://bugzilla.suse.com/1160251
  o https://bugzilla.suse.com/1160937

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