CVE-2021-29456
published 2021-04-21CVE-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…
PriorityP427medium5.4CVSS 3.1
AVNACLPRLUIRSCCLILAN
EPSS
0.51%
39.6th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| authelia | authelia | < 4.28.0 | 4.28.0 |
| authelia | authelia | <= 4.27.4 | — |
| github.com | authelia_authelia_v4 | >= 0 < 4.28.0 | 4.28.0 |
CVSS provenance
nvdv3.15.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
nvdv2.04.9MEDIUMAV:N/AC:M/Au:S/C:P/I:P/A:N
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GHSA
Authelia allows open redirects on the logout endpoint
ghsa·2023-03-16
CVE-2021-29456 [MEDIUM] CWE-601 Authelia allows open redirects on the logout endpoint
Authelia allows open redirects on the logout endpoint
### Impact
Utilizing a HTTP query parameter an attacker is able to redirect users from the web application to any domain. The URL of the intended redirect should always be checked for safety prior to forwarding the user. Other endpoints of the web application already do this, they check both that the domain is using the HTTPS protocol and that it exists on a domain associated with the application.
An attacker is able to use this unintended functionality to redirect users to malicious sites. This particular security issue allows the attacker to make a phishing attempt seem much more trustworthy to a user of the web application as the initial site before redirection is familiar to them, as well as the actual URL which they have theoreti
OSV
Authelia allows open redirects on the logout endpoint
osv·2023-03-16
CVE-2021-29456 [MEDIUM] Authelia allows open redirects on the logout endpoint
Authelia allows open redirects on the logout endpoint
### Impact
Utilizing a HTTP query parameter an attacker is able to redirect users from the web application to any domain. The URL of the intended redirect should always be checked for safety prior to forwarding the user. Other endpoints of the web application already do this, they check both that the domain is using the HTTPS protocol and that it exists on a domain associated with the application.
An attacker is able to use this unintended functionality to redirect users to malicious sites. This particular security issue allows the attacker to make a phishing attempt seem much more trustworthy to a user of the web application as the initial site before redirection is familiar to them, as well as the actual URL which they have theoreti
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2021-04-21
Published