Debian DLA-2490-1 : x11vnc security update

high Nessus Plugin ID 144099

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Synopsis

The remote Debian host is missing a security update.

Description

Guenal Davalan reported a flaw in x11vnc, a VNC server to allow remote access to an existing X session. x11vnc creates shared memory segments with 0777 mode. A local attacker can take advantage of this flaw for information disclosure, denial of service or interfering with the VNC session of another user on the host.

For Debian 9 stretch, this problem has been fixed in version 0.9.13-2+deb9u2.

We recommend that you upgrade your x11vnc packages.

For the detailed security status of x11vnc please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/x11vnc

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.

Solution

Upgrade the affected x11vnc, and x11vnc-data packages.

Plugin Details

Severity: High

ID: 144099

File Name: debian_DLA-2490.nasl

Version: 1.3

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 12/11/2020

Updated: 2/2/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

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

CVSS Score Source: CVE-2020-29074

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:x11vnc-data, cpe:/o:debian:debian_linux:9.0, p-cpe:/a:debian:debian_linux:x11vnc

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 12/10/2020

Vulnerability Publication Date: 11/25/2020

Reference Information

CVE: CVE-2020-29074

Detections

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