ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability
Released: Aug 8, 2023
Last updated: Oct 17, 2023
- Assigning CNA
- Microsoft
- CVE.org link
- CVE-2023-35391
- Impact
- Information Disclosure
- Max Severity
- Important
- CVSS Source
- Microsoft
- Vector String
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
- Metrics
- CVSS:3.1 6.2 / 5.6Base score metrics: 6.2 / Temporal score metrics: 5.6
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Exploit Code Maturity
Proof-of-Concept
Remediation Level
Official Fix
Report Confidence
Confirmed
Please see Common Vulnerability Scoring System for more information on the definition of these metrics.
Exploitability
The following table provides an exploitability assessment for this vulnerability at the time of original publication.
- Publicly disclosed
- No
- Exploited
- No
- Exploitability assessment
- Exploitation Less Likely
FAQ
What type of information could be disclosed by this vulnerability?
This vulnerability makes it possible to listen to any group or user with a specially crafted group/username. By exploiting this vulnerability, the attacker can now receive messages for group(s) that they are unauthorized to view.
According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is information disclosure?
The attack itself is carried out locally. For example, when the score indicates that the Attack Vector is Local (AV:L) and User Interaction is Required (UI:R), this could describe an exploit in which an attacker, through social engineering, convinces a victim to download and run a malicious application. This could lead to a local attack on the user's device which could leak data.
Acknowledgements
- Brennan Conroy
Security Updates
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle.
- 17.6.6
- 17.4.10
- 17.2.18
Disclaimer
Revisions
Updated one or more CVSS scores for the affected products and added an FAQ explaining the vector string settings. This is an informational change only.
Information published.