Vulnerability Name:

CVE-2021-22903 (CCN-201282)

Assigned:2021-05-05
Published:2021-05-05
Updated:2021-10-21
Summary:The actionpack ruby gem before 6.1.3.2 suffers from a possible 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. This is similar to CVE-2021-22881. Strings in config.hosts that do not have a leading dot are converted to regular expressions without proper escaping. This causes, for example, `config.hosts << "sub.example.com"` to permit a request with a Host header value of `sub-example.com`.
CVSS v3 Severity:6.1 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
5.3 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): Low
Integrity (I): Low
Availibility (A): None
7.4 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N)
6.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:5.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
6.8 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-601
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-22903

Source: MISC
Type: Mitigation, Patch, Vendor Advisory
https://discuss.rubyonrails.org/t/cve-2021-22903-possible-open-redirect-vulnerability-in-action-pack/77867

Source: XF
Type: UNKNOWN
rubyonrails-cve202122903-open-redirect(201282)

Source: MISC
Type: Permissions Required, Third Party Advisory
https://hackerone.com/reports/1148025

Source: CCN
Type: Ruby on Rails Web site
Ruby on Rails

Source: CCN
Type: oss-sec Mailing List, Wed, 5 May 2021 09:38:05 -0700
[CVE-2021-22903] Possible Open Redirect Vulnerability in Action Pack

Vulnerable Configuration:Configuration 1:
  • cpe:/a:rubyonrails:rails:6.1.0:rc2:*:*:*:*:*:*
  • OR cpe:/a:rubyonrails:rails:*:*:*:*:*:*:*:* (Version >= 6.1.1 and < 6.1.3.2)

    • * Denotes that component is vulnerable
    BACK
    rubyonrails rails 6.1.0 rc2
    rubyonrails rails *