Use-after-return in TigerVNC - CVE-2019-15691

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Main Vulnerability Database Vulnerabilities #VU23905

Use-after-return in TigerVNC - CVE-2019-15691

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


Vulnerability identifier: #VU23905
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-2019-15691
CWE-ID: CWE-672
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 incorrect usage of stack memory in ZRLEDecoder. If decoding routine would throw an exception, ZRLEDecoder may try to access stack variable, which has been already freed during the process of stack unwinding. A remote attacker can 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-2019-15691

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