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CVE-2019-20840

Good to know:

Date: June 17, 2020

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.

Language: C

Severity Score

7.5

Related Resources (14)

Url: https://security-tracker.debian.org/tracker/CVE-2019-20840

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2019-20840

Url: https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf

Url: https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13

Url: http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00033.html

Url: http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00055.html

Url: https://security.alpinelinux.org/vuln/CVE-2019-20840

Url: https://nvd.nist.gov/vuln/detail/CVE-2019-20840

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4F6FUH4EFK4NAP6GT4TQRTBKWIRCZLIY/

Url: https://usn.ubuntu.com/4434-1/

Url: http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00066.html

Url: https://github.com/LibVNC/libvncserver/commit/0cf1400c61850065de590d403f6d49e32882fd76

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4F6FUH4EFK4NAP6GT4TQRTBKWIRCZLIY/

Url: https://www.mend.io/vulnerability-database/CVE-2019-20840

Severity Score

7.5

Weakness Type (CWE)

Buffer Errors

CWE-119

Out-of-bounds Write

CWE-787

Top Fix

Upgrade Version

Upgrade to version LibVNCServer-0.9.13

CVSS v3.1

Base Score:	7.5
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	LOW
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	HIGH

CVSS v2

Base Score:	5.0
Access Vector (AV):	NETWORK
Access Complexity (AC):	LOW
Authentication (AU):	NONE
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	PARTIAL
Additional information:

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