PT-2019-5757 · Tigervnc+4 · Tigervnc+4

Pavel Cheremushkin · Published 2019-12-20 · Updated 2024-06-15 · CVE-2019-15691

Positive Technologies (AI Summary)

CVSS v3.1

7.2

High

Base vector

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

Name of the Vulnerable Software and Affected Versions TigerVNC versions prior to 1.10.1

Description The issue is related to a use-after-free error in the ZRLEDecoder of TigerVNC, which can be exploited by a remote attacker to access confidential data, compromise data integrity, and cause a denial of service. The vulnerability occurs due to incorrect usage of stack memory in the ZRLEDecoder, potentially allowing remote code execution if the decoding routine throws an exception. This can be exploited via network connectivity.

Recommendations For versions prior to 1.10.1, update to version 1.10.1 or later to resolve the issue. As a temporary workaround, consider restricting network connectivity to minimize the risk of exploitation.

Exploit

Fix

RCE

Weakness Enumeration

CWE-825

CWE-672

Related Identifiers

ALT-PU-2020-2103

ALT-PU-2020-3345

ALT-PU-2021-1185

BDU:2021-01414

CESA-2020_1497

CESA-2020_3875

CVE-2019-15691

MGASA-2020-0042

OPENSUSE-SU-2020:0087-1

OPENSUSE-SU-2020_0087-1

OPENSUSE-SU-2024:10591-1

RHSA-2020:1497

RHSA-2020:3875

RHSA-2020_1497

RHSA-2020_3875

SUSE-SU-2020:0112-1

SUSE-SU-2020:0113-1

SUSE-SU-2020:0159-1

SUSE-SU-2020:0266-1

SUSE-SU-2020:1749-1

SUSE-SU-2020_0112-1

SUSE-SU-2020_0113-1

SUSE-SU-2020_0159-1

SUSE-SU-2020_0266-1

SUSE-SU-2020_1749-1

Affected Products

Alt Linux

Centos

Red Hat

Suse

Tigervnc

References · 52

• 🔥 https://openwall.com/lists/oss-security/2019/12/20/2 · Exploit
• https://github.com/CendioOssman/tigervnc/commit/d61a767d6842b530ffb532ddd5a3d233119aad40 · Patch
• https://wiki.astralinux.ru/astra-linux-se16-bulletin-20211008SE16 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2020:0266-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2019-15691 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-15691 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2020:1749-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:10591-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-15691 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2020-1497.html · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-15691 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2020-0042.html · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2020:0159-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-15691 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-15691 · Vendor Advisory