var-202006-1849
Vulnerability from variot

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode. LibVNCServer Exists in a buffer error vulnerability.Service operation interruption (DoS) It may be put into a state. ========================================================================== Ubuntu Security Notice USN-4434-1 July 23, 2020

libvncserver vulnerabilities

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

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

Summary:

Several security issues were fixed in LibVNCServer.

Software Description: - libvncserver: vnc server library

Details:

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)

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-9ubuntu0.2 libvncserver1 0.9.12+dfsg-9ubuntu0.2

Ubuntu 18.04 LTS: libvncclient1 0.9.11+dfsg-1ubuntu1.3 libvncserver1 0.9.11+dfsg-1ubuntu1.3

Ubuntu 16.04 LTS: libvncclient1 0.9.10+dfsg-3ubuntu0.16.04.5 libvncserver1 0.9.10+dfsg-3ubuntu0.16.04.5

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

References: https://usn.ubuntu.com/4434-1 CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14399, CVE-2020-14400, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405

Package Information: https://launchpad.net/ubuntu/+source/libvncserver/0.9.12+dfsg-9ubuntu0.2 https://launchpad.net/ubuntu/+source/libvncserver/0.9.11+dfsg-1ubuntu1.3 https://launchpad.net/ubuntu/+source/libvncserver/0.9.10+dfsg-3ubuntu0.16.04.5

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