var-202004-2206
Vulnerability from variot

libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690. LibVNCServer Exists in an integer overflow vulnerability.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be put into a state. ========================================================================== Ubuntu Security Notice USN-4407-1 July 01, 2020

libvncserver vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 19.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in LibVNCServer.

Software Description: - libvncserver: vnc server library

Details:

It was discovered that LibVNCServer incorrectly handled decompressing data. An attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2019-15680)

It was discovered that an information disclosure vulnerability existed in LibVNCServer when sending a ServerCutText message. An attacker could possibly use this issue to expose sensitive information. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15681)

It was discovered that LibVNCServer incorrectly handled cursor shape updates. If a user were tricked in to connecting to a malicious server, an attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15690, CVE-2019-20788)

It was discovered that LibVNCServer incorrectly handled decoding WebSocket frames. An attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2017-18922)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS: libvncclient1 0.9.12+dfsg-9ubuntu0.1 libvncserver1 0.9.12+dfsg-9ubuntu0.1

Ubuntu 19.10: libvncclient1 0.9.11+dfsg-1.3ubuntu0.1 libvncserver1 0.9.11+dfsg-1.3ubuntu0.1

Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.2 libvncserver1 0.9.11+dfsg-1ubuntu1.2

Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.4 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.4

After a standard system update you need to restart LibVNCServer to make all the necessary changes.

References: https://usn.ubuntu.com/4407-1 CVE-2017-18922, CVE-2019-15680, CVE-2019-15681, CVE-2019-15690, CVE-2019-20788

Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.1 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1.3ubuntu0.1 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.4

Show details on source website


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