01 March 2019

KLCERT-19-006: UltraVNC Out-of-bound Read

Vendor

UltraVNC

Timeline

Timeline

  • Kaspersky ICS CERT advisory updated

    26 January 2024

  • Kaspersky ICS CERT advisory published

    01 March 2019

  • Vendor releases patch

    February 2019

  • Vulnerabilities reported

    17 January 2019

Description

UltraVNC Viewer before 1.2.2.4 has a out-of-bounds read vulnerability in RRE decoder code, caused by multiplication overflow.

CVSS v3

0.0

 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C)

Exploitability

Remotely

Attack complexity

Low

User interaction

None

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 cause denial-of-service condition of VNC Viewer.

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.

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Timeline

  • Kaspersky ICS CERT advisory updated

    26 January 2024

  • Kaspersky ICS CERT advisory published

    01 March 2019

  • Vendor releases patch

    February 2019

  • Vulnerabilities reported

    17 January 2019

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