#VU22437 Out-of-bounds write in TightVNC - CVE-2019-15679

Vulnerability identifier: #VU22437

Vulnerability risk: High

CVSSv4.0: 8.1 [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-2019-15679

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TightVNC
Web applications / Modules and components for CMS

Vendor: GlavSoft LLC

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error in "InitialiseRFBConnection" function. A remote attacker can trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

TightVNC: 1.3.10

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External links
https://www.openwall.com/lists/oss-security/2018/12/10/5

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.