Information disclosure in LibVNC

Published: 2019-10-29 | Updated: 2020-06-30

Risk	Medium
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2019-15681
CWE-ID	CWE-401
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	LibVNCServer Server applications / Remote management servers, RDP, SSH
Vendor	LibVNC

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated: 30.06.2020

Updated list of affected and fixed versions, changed bulletin status to patched.

1) Memory leak

EUVDB-ID: #VU22957

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-15681

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information on the target system.

The vulnerability exists due memory leak in VNC server code. A remote attacker can read stack memory and disclose sensitive information.

Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR.

Mitigation

Install update from vendor's website.

Vulnerable software versions

LibVNCServer: 0.9.0 - 0.9.12

CPE2.3

External links

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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