Vulnerability · Published Mar 8, 2021 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-severity improper authentication in spnego-http-auth-nginx-module from stnoonan. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 77% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)1.7%top 23.2% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

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

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/stnoonan/spnego-http-auth-nginx-module/security/advisories/GHSA-ww8q-72rx-hc54 x_refsource_CONFIRM
https://github.com/stnoonan/spnego-http-auth-nginx-module/commit/a06f9efca373e25328b1c53639a48decd0854570 x_refsource_MISC
https://github.com/stnoonan/spnego-http-auth-nginx-module/releases/tag/v1.1.1 x_refsource_MISC