PT-2018-2463 · Libvnc+3 · Libvnc+3

Pavel Cheremushkin · Published 2018-12-29 · Updated 2022-03-10 · CVE-2018-20748

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions LibVNC versions prior to 0.9.12

Description The issue is related to multiple heap out-of-bounds write vulnerabilities in the rfbproto.c component of the LibVNC library. This could allow a remote attacker to cause a denial of service and gain unauthorized access to confidential data. The problem is associated with a buffer overflow in memory.

Recommendations For LibVNC versions prior to 0.9.12, update to version 0.9.12 or later to resolve the issue. As a temporary workaround, consider restricting access to the rfbproto.c component until a patch is applied.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

ALT-PU-2019-2585

ALT-PU-2019-2662

ALT-PU-2021-1040

BDU:2019-00702

CVE-2018-20748

DLA-1652-1

DLA-1979-1

DLA-2045-1

MGASA-2020-0435

OPENSUSE-SU-2019:0196-1

OPENSUSE-SU-2019_0196-1

OPENSUSE-SU-2019_0200-1

OPENSUSE-SU-2024:10598-1

SUSE-SU-2019:0283-1

SUSE-SU-2019:0313-1

SUSE-SU-2019:0313-2

SUSE-SU-2019:13952-1

SUSE-SU-2019_0283-1

SUSE-SU-2019_0313-1

SUSE-SU-2019_0313-2

SUSE-SU-2019_13952-1

USN-3877-1

USN-4547-1

USN-4587-1

Affected Products

Alt Linux

Libvnc

Suse

Ubuntu

References · 71

• 🔥 https://openwall.com/lists/oss-security/2018/12/10/8 · Exploit
• https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7 · Patch
• https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2c · Patch
• https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42bae · Patch
• https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2a · Patch
• https://usn.ubuntu.com/3877-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2018-20748 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2019:0283-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-20021 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-20748 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-6307 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-2045-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-20023 · Vendor Advisory
• https://ubuntu.com/security/CVE-2014-6053 · Vendor Advisory
• https://ubuntu.com/security/CVE-2014-6055 · Vendor Advisory