Vulnerability Details : CVE-2021-29456
Authelia is an open-source authentication and authorization server providing 2-factor authentication and single sign-on (SSO) for your applications via a web portal. In versions 4.27.4 and earlier, utilizing a HTTP query parameter an attacker is able to redirect users from the web application to any domain, including potentially malicious sites. This security issue does not directly impact the security of the web application itself. As a workaround, one can use a reverse proxy to strip the query parameter from the affected endpoint. There is a patch for version 4.28.0.
Vulnerability category: Open redirect
Products affected by CVE-2021-29456
- cpe:2.3:a:authelia:authelia:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-29456
0.15%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 32 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-29456
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.9
|
MEDIUM | AV:N/AC:M/Au:S/C:P/I:P/A:N |
6.8
|
4.9
|
NIST | |
|
5.4
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
2.3
|
2.7
|
NIST | |
|
5.7
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N |
2.1
|
3.6
|
GitHub, Inc. |
CWE ids for CVE-2021-29456
-
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.Assigned by: security-advisories@github.com (Primary)
References for CVE-2021-29456
-
https://github.com/authelia/authelia/security/advisories/GHSA-36f2-fcrx-fp4j
Authelia allows open redirects on the logout endpoint · Advisory · authelia/authelia · GitHubPatch;Third Party Advisory
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