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CVE-2021-21335— Basic Authentication can be bypassed using a malformed username

Quick assessment

Affected
stnoonan spnego-http-auth-nginx-module
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sean Timothy Noonan spnego-http-auth-nginx-module是 （Sean Timothy Noonan）开源的一个应用软件。提供一个将SPNEGO 支持添加到nginx功能。 SPNEGO HTTP Authentication Module for nginx 存在安全漏洞，该漏洞源于基本身份验证可以使用格式错误的用户名绕过。

CVSS 5.3 · Medium EPSS 1.66% · P75

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-21335

Vulnerability Information
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Vulnerability Title
Basic Authentication can be bypassed using a malformed username
Source: CVE Program / CVE List V5
Vulnerability Description
In the SPNEGO HTTP Authentication Module for nginx (spnego-http-auth-nginx-module) before version 1.1.1 basic Authentication can be bypassed using a malformed username. This affects users of spnego-http-auth-nginx-module that have enabled basic authentication. This is fixed in version 1.1.1 of spnego-http-auth-nginx-module. As a workaround, one may disable basic authentication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
spnego-http-auth-nginx-module 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sean Timothy Noonan spnego-http-auth-nginx-module是 （Sean Timothy Noonan）开源的一个应用软件。提供一个将SPNEGO 支持添加到nginx功能。 SPNEGO HTTP Authentication Module for nginx 存在安全漏洞，该漏洞源于基本身份验证可以使用格式错误的用户名绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
stnoonan spnego-http-auth-nginx-module < 1.1.1 -

II. Public POCs for CVE-2021-21335

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III. Intelligence Information for CVE-2021-21335

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Patches & Fixes for CVE-2021-21335 (1)

Vendor Advisories for CVE-2021-21335 (1)

Other References for CVE-2021-21335 (1)

IV. Related Vulnerabilities

Same weakness: CWE-287

V. Comments for CVE-2021-21335

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