CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
8.3 | $0-$5k | 0.00 |
A vulnerability classified as critical has been found in UltraVNC up to 1.2.2.3 (Connectivity Software). This affects an unknown functionality of the component VNC Server. The manipulation with an unknown input leads to a calculation vulnerability. CWE is classifying the issue as CWE-682. The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:
UltraVNC revision 1211 has multiple off-by-one vulnerabilities in VNC server code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1212.
The bug was discovered 03/01/2019. The weakness was disclosed 03/08/2019 by Pavel Cheremushkin with Kaspersky Lab ICS CERT as KLCERT-19-019: UltraVNC Off-by-one Error as confirmed advisory (Website). The advisory is shared at ics-cert.kaspersky.com. The original advisory by Kaspersky has a very bad quality and consists of contradicting statements (e.g. summary and CVSS vectors). This vulnerability is uniquely identified as CVE-2019-8272 since 02/12/2019. It is possible to initiate the attack remotely. The successful exploitation needs a authentication. Neither technical details nor an exploit are publicly available. The advisory points out:
UltraVNC revision 1211 has a multiple off-by-one vulnerabilities in VNC server code, which can potentially result code execution. This attack appear to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1212.
The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $5k-$25k. The advisory illustrates:
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code.
Upgrading to version 1.2.2.4 eliminates this vulnerability. Applying the patch Revision 1212 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 6 days after the disclosure of the vulnerability.
Further details are available at us-cert.gov. The entries 131509, 131510, 131511 and 131512 are pretty similar.
Product
Type
Name
Version
- 1.0.4
- 1.0.5
- 1.0.5.1
- 1.0.8.2
- 1.0.9.5
- 1.0.9.6
- 1.0.9.6.2
- 1.1.4
- 1.1.5
- 1.1.8.0
- 1.1.8.3
- 1.1.8.4
- 1.1.8.5
- 1.1.8.6
- 1.1.8.9
- 1.1.9.0
- 1.1.9.1
- 1.1.9.3
- 1.1.9.6
- 1.2.0.1
- 1.2.0.3
- 1.2.0.4
- 1.2.0.5
- 1.2.0.6
- 1.2.0.7
- 1.2.0.9
- 1.2.1.1
- 1.2.1.2
- 1.2.1.6
- 1.2.1.7
- 1.2.2.1
- 1.2.2.2
- 1.2.2.3
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 8.7VulDB Meta Temp Score: 8.6
VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍
Researcher Base Score: 10.0
Researcher Vector: 🔍
NVD Base Score: 9.8
NVD Vector: 🔍
CVSSv2
AV | AC | Au | C | I | A |
---|---|---|---|---|---|
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
---|---|---|---|---|---|
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: CalculationCWE: CWE-682
CAPEC: 🔍
ATT&CK: 🔍
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
---|---|---|---|---|
Today | unlock | unlock | unlock | unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Upgrade: UltraVNC 1.2.2.4
Patch: Revision 1212
Timeline
02/12/2019 🔍03/01/2019 🔍
03/08/2019 🔍
03/09/2019 🔍
03/14/2019 🔍
05/28/2020 🔍
Sources
Advisory: KLCERT-19-019: UltraVNC Off-by-one ErrorResearcher: Pavel Cheremushkin
Organization: Kaspersky Lab ICS CERT
Status: Confirmed
CVE: CVE-2019-8272 (🔍)
Misc.: 🔍
See also: 🔍
Entry
Created: 03/09/2019 12:00Updated: 05/28/2020 22:49
Changes: 03/09/2019 12:00 (81), 05/28/2020 22:49 (1)
Complete: 🔍
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