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EulerOS 2.0 SP3 : libvncserver (EulerOS-SA-2020-2116)

critical Nessus Plugin ID 140883

Synopsis

The remote EulerOS host is missing multiple security updates.

Description

According to the versions of the libvncserver package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

 - LibVNCServer makes writing a VNC server (or more correctly, a program exporting a frame-buffer via the Remote Frame Buffer protocol) easy. It hides the programmer from the tedious task of managing clients and compression schemata.Security Fix(es):An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.(CVE-2018-21247)libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename.(CVE-2019-20839)An issue was discovered in LibVNCServer before 0.9.13.
 libvncserver/rfbregion.c has a NULL pointer dereference.(CVE-2020-14397)An issue was discovered in LibVNCServer before 0.9.13. An improperly closed TCP connection causes an infinite loop in libvncclient/sockets.c.(CVE-2020-14398)An issue was discovered in LibVNCServer before 0.9.13. Byte-aligned data is accessed through uint32_t pointers in libvncclient/rfbproto.c. NOTE: there is reportedly 'no trust boundary crossed.'(CVE-2020-14399)An issue was discovered in LibVNCServer before 0.9.13. Byte-aligned data is accessed through uint16_t pointers in libvncserver/translate.c. NOTE: Third parties do not consider this to be a vulnerability as there is no known path of exploitation or cross of a trust boundary.(CVE-2020-14400)An issue was discovered in LibVNCServer before 0.9.13. libvncserver/scale.c has a pixel_value integer overflow.(CVE-2020-14401)An issue was discovered in LibVNCServer before 0.9.13.
 libvncserver/corre.c allows out-of-bounds access via encodings.(CVE-2020-14402)An issue was discovered in LibVNCServer before 0.9.13. libvncserver/hextile.c allows out-of-bounds access via encodings.(CVE-2020-14403)An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rre.c allows out-of-bounds access via encodings.(CVE-2020-14404)An issue was discovered in LibVNCServer before 0.9.13.
 libvncclient/rfbproto.c does not limit TextChat size.(CVE-2020-14405)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. (CVE-2019-20788)

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

Solution

Update the affected libvncserver packages.

See Also

http://www.nessus.org/u?95cb084f

Plugin Details

Severity: Critical

ID: 140883

File Name: EulerOS_SA-2020-2116.nasl

Version: 1.6

Type: local

Published: 9/28/2020

Updated: 2/19/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2019-20788

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:huawei:euleros:libvncserver, cpe:/o:huawei:euleros:2.0

Required KB Items: Host/local_checks_enabled, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/sp

Excluded KB Items: Host/EulerOS/uvp_version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/28/2020

Reference Information

CVE: CVE-2018-21247, CVE-2019-20788, CVE-2019-20839, 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