UltraVNC Revision 1198 Client insufficient psychological acceptability

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in UltraVNC Revision 1198. The affected element is an unknown function of the component Client. The manipulation leads to insufficient psychological acceptability. This vulnerability is uniquely identified as CVE-2019-8259. The attack is possible to be carried out remotely. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in UltraVNC Revision 1198 (Connectivity Software). This issue affects some unknown functionality of the component Client. The manipulation with an unknown input leads to a insufficient psychological acceptability vulnerability. Using CWE to declare the problem leads to CWE-655. The product has a protection mechanism that is too difficult or inconvenient to use, encouraging non-malicious users to disable or bypass the mechanism, whether by accident or on purpose. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

UltraVNC revision 1198 contains multiple memory leaks (CWE-655) in VNC client code, which allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1199.

The bug was discovered 03/01/2019. The weakness was disclosed 03/05/2019. The identification of this vulnerability is CVE-2019-8259 since 02/12/2019. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371706 (UltraVNC Multiple Code Execution Vulnerabilities).

Applying the patch Revision 1199 is able to eliminate this problem.

The entries VDB-131316, VDB-131356, VDB-131358 and VDB-131359 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Insufficient psychological acceptability
CWE: CWE-655
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: Revision 1199

Timelineinfo

02/12/2019 🔍
03/01/2019 +17 days 🔍
03/05/2019 +4 days 🔍
03/06/2019 +1 days 🔍
07/26/2023 +1603 days 🔍

Sourcesinfo

Advisory: ssa-286838
Status: Not defined

CVE: CVE-2019-8259 (🔍)
GCVE (CVE): GCVE-0-2019-8259
GCVE (VulDB): GCVE-100-131357
See also: 🔍

Entryinfo

Created: 03/06/2019 08:43
Updated: 07/26/2023 16:14
Changes: 03/06/2019 08:43 (59), 05/28/2020 17:00 (1), 07/26/2023 16:14 (5)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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