The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3877-1 advisory.

    It was discovered that LibVNCServer incorrectly handled certain operations. A remote attacker able to     connect to applications using LibVNCServer could possibly use this issue to obtain sensitive information,     cause a denial of service, or execute arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Several vulnerabilities have recently been discovered in TightVNC 1.x, an X11 based VNC server/viewer application for Windows and Unix.

CVE-2014-6053

The rfbProcessClientNormalMessage function in rfbserver.c in TightVNC server did not properly handle attempts to send a large amount of ClientCutText data, which allowed remote attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that was processed by using a single unchecked malloc.

CVE-2018-7225

rfbProcessClientNormalMessage() in rfbserver.c did not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact (e.g., an integer overflow) via specially crafted VNC packets.

CVE-2019-8287

TightVNC code contained global buffer overflow in HandleCoRREBBP macro function, which could potentially have result in code execution. This attack appeared to be exploitable via network connectivity.

(aka CVE-2018-20020/libvncserver)

CVE-2018-20021

TightVNC in vncviewer/rfbproto.c contained a CWE-835: Infinite loop vulnerability. The vulnerability allowed an attacker to consume an excessive amount of resources like CPU and RAM.

CVE-2018-20022

TightVNC's vncviewer contained multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allowed attackers to read stack memory and could be abused for information disclosure.
Combined with another vulnerability, it could be used to leak stack memory layout and in bypassing ASLR.

CVE-2019-15678

TightVNC code version contained heap buffer overflow in rfbServerCutText handler, which could have potentially resulted in code execution. This attack appeared to be exploitable via network connectivity.

(partially aka CVE-2018-20748/libvnvserver)

CVE-2019-15679

TightVNC's vncviewer code contained a heap buffer overflow in InitialiseRFBConnection function, which could have potentially resulted in code execution. This attack appeared to be exploitable via network connectivity.

(partially aka CVE-2018-20748/libvnvserver)

CVE-2019-15680

TightVNC's vncviewer code contained a NULL pointer dereference in HandleZlibBPP function, which could have resulted in Denial of System (DoS). This attack appeared to be exploitable via network connectivity.

CVE-2019-15681

TightVNC contained a memory leak (CWE-655) in VNC server code, which allowed an attacker to read stack memory and could have been abused for information disclosure. Combined with another vulnerability, it could have been used to leak stack memory and bypass ASLR. This attack appeared to be exploitable via network connectivity.

For Debian 8 'Jessie', these problems have been fixed in version 1.3.9-6.5+deb8u1.

We recommend that you upgrade your tightvnc packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4547-2 advisory.

    It was discovered that the LibVNCClient vendored in SSVNC incorrectly handled certain packet lengths. A     remote attacker could possibly use this issue to obtain sensitive information, cause a denial of service,     or execute arbitrary code. (CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-2024)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This update for LibVNCServer fixes the following issues :

Security issues fixed :

CVE-2018-15126: Fixed use-after-free in file transfer extension (bsc#1120114)

CVE-2018-6307: Fixed use-after-free in file transfer extension server code (bsc#1120115)

CVE-2018-20020: Fixed heap out-of-bound write inside structure in VNC client code (bsc#1120116)

CVE-2018-15127: Fixed heap out-of-bounds write in rfbserver.c (bsc#1120117)

CVE-2018-20019: Fixed multiple heap out-of-bound writes in VNC client code (bsc#1120118)

CVE-2018-20023: Fixed information disclosure through improper initialization in VNC Repeater client code (bsc#1120119)

CVE-2018-20022: Fixed information disclosure through improper initialization in VNC client code (bsc#1120120)

CVE-2018-20024: Fixed NULL pointer dereference in VNC client code (bsc#1120121)

CVE-2018-20021: Fixed infinite loop in VNC client code (bsc#1120122)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4587-1 advisory.

    Nicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors and didn't check malloc     return values. A remote attacker could use these issues to cause a denial of service or possibly execute     arbitrary code. (CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055)

    Josef Gajdusek discovered that iTALC had heap-based buffer overflow vulnerabilities. A remote attacker     could used these issues to cause a denial of service or possibly execute arbitrary code. (CVE-2016-9941,     CVE-2016-9942)

    It was discovered that iTALC had an out-of-bounds write, multiple heap out-of-bounds writes, an infinite     loop, improper initializations, and null pointer vulnerabilities. A remote attacker could used these     issues to cause a denial of service or possibly execute arbitrary code. (CVE-2018-15127, CVE-2018-20019,     CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748,     CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名稱	產品	系列	已發布	已更新	嚴重性
121541	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : LibVNCServer vulnerabilities (USN-3877-1)	Nessus	Ubuntu Local Security Checks	2019/2/1	2024/8/27	critical
132345	Debian DLA-2045-1 : tightvnc security update	Nessus	Debian Local Security Checks	2019/12/23	2024/4/2	critical
140929	Ubuntu 16.04 LTS : SSVNC vulnerabilities (USN-4547-2)	Nessus	Ubuntu Local Security Checks	2020/9/29	2024/8/27	critical
121094	SUSE SLES12 Security Update : LibVNCServer (SUSE-SU-2019:0060-1)	Nessus	SuSE Local Security Checks	2019/1/11	2021/1/13	critical
141545	Ubuntu 16.04 LTS : iTALC vulnerabilities (USN-4587-1)	Nessus	Ubuntu Local Security Checks	2020/10/20	2024/8/27	critical

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