Out-of-bounds write in TigerVNC - CVE-2019-15695
Published: January 3, 2020 / Updated: March 24, 2020
Vulnerability identifier: #VU23908
CSH Severity: High
CVSS v4.0: 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/E:U/U:Amber
CVE-ID: CVE-2019-15695
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: tigervnc.org
Affected software:
TigerVNC
TigerVNC
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to insufficient sanitization of PixelFormat. A remote attacker can trigger out-of-bounds write from "CMsgReader::readSetCursor" and execute arbitrary code on the target system.
How to mitigate CVE-2019-15695
Install updates from vendor's website.
Sources
- https://github.com/CendioOssman/tigervnc/commit/05e28490873a861379c943bf616614b78b558b89
- https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1
- https://www.openwall.com/lists/oss-security/2019/12/20/2
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2020/03/23/klcert-20-008-remote-code-execution-on-tigervnc-version-prior-to-1-10-1-2/