Heap-based buffer overflow in TigerVNC - CVE-2019-15693

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Main Vulnerability Database Vulnerabilities #VU23907

Heap-based buffer overflow in TigerVNC - CVE-2019-15693

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


Vulnerability identifier: #VU23907
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-2019-15693
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 a boundary error in "TightDecoder::FilterGradient". A remote attacker can trigger heap-based buffer overflow 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
Red Hat Enterprise Linux Server
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 for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
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)

How to mitigate CVE-2019-15693

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

External References

Related Security Bulletins