Staging Environment: Content and features may be unstable or change without notice.
Advisory details: gitlab / gem/rails/CVE-2021-22881
Advisory ID gitlab/gem/rails/CVE-2021-22881
Aliases CVE-2021-22881
Summary URL Redirection to Untrusted Site (Open Redirect) The Host Authorization middleware in Action Pack suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain "allowed host" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.
Status Published
Exploitability 2.0
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
System Score Found at
cvssv2 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/rails/CVE-2021-22881.yml
cvssv3.1 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/rails/CVE-2021-22881.yml
Reference id Reference type URL
https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130
CVE-2021-22881 https://nvd.nist.gov/vuln/detail/CVE-2021-22881
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/rails/CVE-2021-22881.yml
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/rails/CVE-2021-22881.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.