KLCERT-19-013: UltraVNC Access of Memory Location After End of Buffer

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Advisories
KLCERT-19-013: UltraVNC Access of Memory Location After End of Buffer

01 March 2019

Vendor

UltraVNC

CVE-IDS

2019-8266
KLCERT

KLCERT-19-013

Timeline

Kaspersky ICS CERT advisory updated

02 November 2023
Kaspersky ICS CERT advisory published

01 March 2019
Vendor releases patch

February 2019
Vulnerabilities reported

17 January 2019

Description

This is due to incorrect use of the ClientConnection::Copybuffer function. An attacker controlling a device with the UltraVNC Server running can perform remote code execution on the client devices to cause a denial-of-service condition, modify system's data and/or obtain sensitive information.

CWE

CWE-788: Access of Memory Location After End of Buffer

CVSS v3

0.0

(AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C)

Exploitability

Remotely exploitable, network access is required

Attack complexity

Low

User interaction

Required

Attack Conditions

The security vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires user connection to the attacker’s server.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code.

Existence of exploit

PoC

Affected products

UltraVNC before 1.2.2.4

Mitigation

Vendor mitigation

Update UltraVNC to 1.2.2.4 or newer

Kaspersky Lab publishes information on newly identified vulnerabilities in order to raise user awareness of the IT security threats detected. Kaspersky Lab does not make any guarantees in respect of information received from vendors of products in which vulnerabilities have been identified, which is included in the following sections of the advisory: Affected Products, Vendor Mitigation.

Timeline

Kaspersky ICS CERT advisory updated

02 November 2023
Kaspersky ICS CERT advisory published

01 March 2019
Vendor releases patch

February 2019
Vulnerabilities reported

17 January 2019