Test ID:	1.3.6.1.4.1.25623.1.0.844508
Category:	Ubuntu Local Security Checks
Title:	Ubuntu: Security Advisory (USN-4434-1)
Summary:	The remote host is missing an update for the 'libvncserver' package(s) announced via the USN-4434-1 advisory.
Description:	Summary: The remote host is missing an update for the 'libvncserver' package(s) announced via the USN-4434-1 advisory. Vulnerability Insight: Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839) It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840) Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396) It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397) It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398) It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400) It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401) It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404) It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405) Affected Software/OS: 'libvncserver' package(s) on Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04. Solution: Please install the updated package(s). CVSS Score: 6.4 CVSS Vector: AV:N/AC:L/Au:N/C:N/I:P/A:P
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2019-20839 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4F6FUH4EFK4NAP6GT4TQRTBKWIRCZLIY/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NVP7TJVYJDXDFRHVQ3ENEN3H354QPXEZ/ https://github.com/LibVNC/libvncserver/commit/3fd03977c9b35800d73a865f167338cb4d05b0c1 https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13 https://lists.debian.org/debian-lts-announce/2020/06/msg00035.html https://lists.debian.org/debian-lts-announce/2020/08/msg00045.html SuSE Security Announcement: openSUSE-SU-2020:0988 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00033.html SuSE Security Announcement: openSUSE-SU-2020:1025 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00055.html SuSE Security Announcement: openSUSE-SU-2020:1056 (Google Search) http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00066.html https://usn.ubuntu.com/4434-1/ Common Vulnerability Exposure (CVE) ID: CVE-2019-20840 https://github.com/LibVNC/libvncserver/commit/0cf1400c61850065de590d403f6d49e32882fd76 Common Vulnerability Exposure (CVE) ID: CVE-2020-14396 https://github.com/LibVNC/libvncserver/commit/33441d90a506d5f3ae9388f2752901227e430553 Common Vulnerability Exposure (CVE) ID: CVE-2020-14397 https://github.com/LibVNC/libvncserver/commit/38e98ee61d74f5f5ab4aa4c77146faad1962d6d0 https://usn.ubuntu.com/4573-1/ Common Vulnerability Exposure (CVE) ID: CVE-2020-14398 https://github.com/LibVNC/libvncserver/commit/57433015f856cc12753378254ce4f1c78f5d9c7b Common Vulnerability Exposure (CVE) ID: CVE-2020-14399 https://bugzilla.redhat.com/show_bug.cgi?id=1860354 https://github.com/LibVNC/libvncserver/commit/23e5cbe6b090d7f22982aee909a6a618174d3c2d Common Vulnerability Exposure (CVE) ID: CVE-2020-14400 https://bugzilla.redhat.com/show_bug.cgi?id=1860361 https://github.com/LibVNC/libvncserver/commit/53073c8d7e232151ea2ecd8a1243124121e10e2d Common Vulnerability Exposure (CVE) ID: CVE-2020-14401 https://github.com/LibVNC/libvncserver/commit/a6788d1da719ae006605b78d22f5a9f170b423af Common Vulnerability Exposure (CVE) ID: CVE-2020-14402 https://github.com/LibVNC/libvncserver/commit/74e8a70f2c9a5248d6718ce443e07c7ed314dfff Common Vulnerability Exposure (CVE) ID: CVE-2020-14403 Common Vulnerability Exposure (CVE) ID: CVE-2020-14404 Common Vulnerability Exposure (CVE) ID: CVE-2020-14405 https://github.com/LibVNC/libvncserver/commit/8937203441ee241c4ace85da687b7d6633a12365
Copyright	Copyright (C) 2020 Greenbone AG

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