Heap-based buffer overflow in TigerVNC - CVE-2019-15694

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Main Vulnerability Database Vulnerabilities #VU23903

Heap-based buffer overflow in TigerVNC - CVE-2019-15694

Published: January 3, 2020 / Updated: March 24, 2020


Vulnerability identifier: #VU23903
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-15694
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to the signedness error in processing MemOutStream. A remote attacker can trigger heap-based buffer overflow from DecodeManager::decodeRect and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Affected software

TigerVNC
Amazon Linux AMI
Gentoo Linux
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Opensuse
tigervnc (Red Hat package)
net-misc/tigervnc

How to mitigate CVE-2019-15694

Install updates from vendor's website.

TigerVNC - update to 1.10.1
tigervnc (Red Hat package) - addressed in versions 1.8.0-21.el7, 1.9.0-14.el8_1
net-misc/tigervnc - update to 1.12.0-r2

External References

Related Security Bulletins