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CVE-2018-8171:
Security feature bypass vulnerability exists in ASP.NET when the number of incorrect login attempts is not validated

7.5

CVSS Score
3.0

Basic Information

EPSS Score
0.93267%
Published
10/16/2018
Updated
2/1/2023
KEV Status
No
Technology
TechnologyC#

Technical Details

CVSS Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Package NameEcosystemVulnerable VersionsFirst Patched Version
Microsoft.AspNetCore.Identitynuget>= 1.0.0, <= 1.0.51.0.6
Microsoft.AspNetCore.Identitynuget>= 1.1.0, <= 1.1.51.1.6
Microsoft.AspNetCore.Identitynuget>= 2.0.0, <= 2.0.32.0.4
Microsoft.AspNetCore.Identitynuget>= 2.1.0, <= 2.1.12.1.2

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability centers on improper tracking of failed login attempts. In ASP.NET Identity:

  1. UserManager.CheckPasswordAsync is the core method for password validation that would need to track failed attempts
  2. SignInManager.PasswordSignInAsync is the main entry point for login attempts that should enforce lockout policies These functions would appear in stack traces during authentication attempts and were likely modified in patched versions to add proper attempt counting and lockout validation. The high confidence comes from their central role in authentication flows and the vulnerability's focus on attempt validation missing in security controls.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

* S**urity ***tur* *yp*ss vuln*r**ility *xists in *SP.N*T w**n t** num**r o* in*orr**t lo*in *tt*mpts is not v*li**t**, *k* "*SP.N*T S**urity ***tur* *yp*ss Vuln*r**ility." T*is *****ts *SP.N*T, *SP.N*T *or* *.*, *SP.N*T *or* *.*, *SP.N*T *or* *.*, *

Reasoning

T** vuln*r**ility **nt*rs on improp*r tr**kin* o* **il** lo*in *tt*mpts. In *SP.N*T I**ntity: *. Us*rM*n***r.****kP*sswor**syn* is t** *or* m*t*o* *or p*sswor* v*li**tion t**t woul* n*** to tr**k **il** *tt*mpts *. Si*nInM*n***r.P*sswor*Si*nIn*syn* i