Security update for tigervnc SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2020:0266-1 Final 1 1 2020-01-30T14:20:18Z current 2020-01-30T14:20:18Z 2020-01-30T14:20:18Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for tigervnc This update for tigervnc provides the following fixes: Security issues fixed: - CVE-2019-15691: Fixed a use-after-return due to incorrect usage of stack memory in ZRLEDecoder (bsc#1159856). - CVE-2019-15692: Fixed a heap-based buffer overflow in CopyRectDecode (bsc#1160250). - CVE-2019-15693: Fixed a heap-based buffer overflow in TightDecoder::FilterGradient (bsc#1159858). - CVE-2019-15694: Fixed a heap-based buffer overflow, caused by improper error handling in processing MemOutStream (bsc#1160251). - CVE-2019-15695: Fixed a stack-based buffer overflow, which could be triggered from CMsgReader::readSetCursor (bsc#1159860). Non-security issue fixed: - Make sure CN in generated certificate doesn't exceed 64 characters. (bnc#1041847) - Change with-vnc-key.sh to generate TLS certificate using current hostname to keep it short. (bsc#1041847) - Disable MIT-SHM extension when running under user 'vnc'. (bsc#1053373) The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-2020-266,SUSE-SLE-SAP-12-SP1-2020-266,SUSE-SLE-SERVER-12-SP1-2020-266 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2020/suse-su-20200266-1/ Link for SUSE-SU-2020:0266-1 https://lists.suse.com/pipermail/sle-security-updates/2020-January/006418.html E-Mail link for SUSE-SU-2020:0266-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1041847 SUSE Bug 1041847 https://bugzilla.suse.com/1053373 SUSE Bug 1053373 https://bugzilla.suse.com/1159856 SUSE Bug 1159856 https://bugzilla.suse.com/1159858 SUSE Bug 1159858 https://bugzilla.suse.com/1159860 SUSE Bug 1159860 https://bugzilla.suse.com/1160250 SUSE Bug 1160250 https://bugzilla.suse.com/1160251 SUSE Bug 1160251 https://bugzilla.suse.com/1160937 SUSE Bug 1160937 https://www.suse.com/security/cve/CVE-2019-15691/ SUSE CVE CVE-2019-15691 page https://www.suse.com/security/cve/CVE-2019-15692/ SUSE CVE CVE-2019-15692 page https://www.suse.com/security/cve/CVE-2019-15693/ SUSE CVE CVE-2019-15693 page https://www.suse.com/security/cve/CVE-2019-15694/ SUSE CVE CVE-2019-15694 page https://www.suse.com/security/cve/CVE-2019-15695/ SUSE CVE CVE-2019-15695 page SUSE Linux Enterprise Server 12 SP1-LTSS SUSE Linux Enterprise Server for SAP Applications 12 SP1 tigervnc-1.4.3-25.11.1 xorg-x11-Xvnc-1.4.3-25.11.1 tigervnc-1.4.3-25.11.1 as a component of SUSE Linux Enterprise Server 12 SP1-LTSS xorg-x11-Xvnc-1.4.3-25.11.1 as a component of SUSE Linux Enterprise Server 12 SP1-LTSS tigervnc-1.4.3-25.11.1 as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP1 xorg-x11-Xvnc-1.4.3-25.11.1 as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP1 TigerVNC version prior to 1.10.1 is vulnerable to stack use-after-return, which occurs due to incorrect usage of stack memory in ZRLEDecoder. If decoding routine would throw an exception, ZRLEDecoder may try to access stack variable, which has been already freed during the process of stack unwinding. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity. CVE-2019-15691 SUSE Linux Enterprise Server 12 SP1-LTSS:tigervnc-1.4.3-25.11.1 SUSE Linux Enterprise Server 12 SP1-LTSS:xorg-x11-Xvnc-1.4.3-25.11.1 SUSE Linux Enterprise Server for SAP Applications 12 SP1:tigervnc-1.4.3-25.11.1 SUSE Linux Enterprise Server for SAP Applications 12 SP1:xorg-x11-Xvnc-1.4.3-25.11.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2020/suse-su-20200266-1/ https://www.suse.com/security/cve/CVE-2019-15691.html CVE-2019-15691 https://bugzilla.suse.com/1159856 SUSE Bug 1159856 TigerVNC version prior to 1.10.1 is vulnerable to heap buffer overflow. Vulnerability could be triggered from CopyRectDecoder due to incorrect value checks. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity. CVE-2019-15692 SUSE Linux Enterprise Server 12 SP1-LTSS:tigervnc-1.4.3-25.11.1 SUSE Linux Enterprise Server 12 SP1-LTSS:xorg-x11-Xvnc-1.4.3-25.11.1 SUSE Linux Enterprise Server for SAP Applications 12 SP1:tigervnc-1.4.3-25.11.1 SUSE Linux Enterprise Server for SAP Applications 12 SP1:xorg-x11-Xvnc-1.4.3-25.11.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2020/suse-su-20200266-1/ https://www.suse.com/security/cve/CVE-2019-15692.html CVE-2019-15692 https://bugzilla.suse.com/1160250 SUSE Bug 1160250 TigerVNC version prior to 1.10.1 is vulnerable to heap buffer overflow, which occurs in TightDecoder::FilterGradient. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity. CVE-2019-15693 SUSE Linux Enterprise Server 12 SP1-LTSS:tigervnc-1.4.3-25.11.1 SUSE Linux Enterprise Server 12 SP1-LTSS:xorg-x11-Xvnc-1.4.3-25.11.1 SUSE Linux Enterprise Server for SAP Applications 12 SP1:tigervnc-1.4.3-25.11.1 SUSE Linux Enterprise Server for SAP Applications 12 SP1:xorg-x11-Xvnc-1.4.3-25.11.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2020/suse-su-20200266-1/ https://www.suse.com/security/cve/CVE-2019-15693.html CVE-2019-15693 https://bugzilla.suse.com/1159858 SUSE Bug 1159858 TigerVNC version prior to 1.10.1 is vulnerable to heap buffer overflow, which could be triggered from DecodeManager::decodeRect. Vulnerability occurs due to the signdness error in processing MemOutStream. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity. CVE-2019-15694 SUSE Linux Enterprise Server 12 SP1-LTSS:tigervnc-1.4.3-25.11.1 SUSE Linux Enterprise Server 12 SP1-LTSS:xorg-x11-Xvnc-1.4.3-25.11.1 SUSE Linux Enterprise Server for SAP Applications 12 SP1:tigervnc-1.4.3-25.11.1 SUSE Linux Enterprise Server for SAP Applications 12 SP1:xorg-x11-Xvnc-1.4.3-25.11.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2020/suse-su-20200266-1/ https://www.suse.com/security/cve/CVE-2019-15694.html CVE-2019-15694 https://bugzilla.suse.com/1160251 SUSE Bug 1160251 TigerVNC version prior to 1.10.1 is vulnerable to stack buffer overflow, which could be triggered from CMsgReader::readSetCursor. This vulnerability occurs due to insufficient sanitization of PixelFormat. Since remote attacker can choose offset from start of the buffer to start writing his values, exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity. CVE-2019-15695 SUSE Linux Enterprise Server 12 SP1-LTSS:tigervnc-1.4.3-25.11.1 SUSE Linux Enterprise Server 12 SP1-LTSS:xorg-x11-Xvnc-1.4.3-25.11.1 SUSE Linux Enterprise Server for SAP Applications 12 SP1:tigervnc-1.4.3-25.11.1 SUSE Linux Enterprise Server for SAP Applications 12 SP1:xorg-x11-Xvnc-1.4.3-25.11.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2020/suse-su-20200266-1/ https://www.suse.com/security/cve/CVE-2019-15695.html CVE-2019-15695 https://bugzilla.suse.com/1159860 SUSE Bug 1159860