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Phoenix Arbitrary URL Redirect

Moderate severity GitHub Reviewed Published Apr 12, 2022 to the GitHub Advisory Database • Updated Sep 7, 2023

Package

erlang phoenix (Erlang)

Affected versions

< 1.0.6
>= 1.1.0, < 1.1.8
>= 1.2.0, < 1.2.3

Patched versions

1.0.6
1.1.8
1.2.3

Description

The Phoenix team designed Phoenix.Controller.redirect/2 to protect against redirects allowing user input to redirect to an external URL where your application code otherwise assumes a local path redirect. This is why the :to option is used for “local” URL redirects and why you must pass the :external option to intentionally allow external URLs to be redirected to. It has been disclosed that carefully crafted user input may be treated by some browsers as an external URL. An attacker can use this vulnerability to aid in social engineering attacks. The most common use would be to create highly believable phishing attacks. For example, the following user input would pass local URL validation, but be treated by Chrome and Firefox as external URLs:
http://localhost:4000/?redirect=/\nexample.com
Not all browsers are affected, but latest Chrome and Firefox will issue a get request for example.com and successfully redirect externally

References

Published to the GitHub Advisory Database Apr 12, 2022
Reviewed Apr 12, 2022
Last updated Sep 7, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.184%
(56th percentile)

Weaknesses

CVE ID

CVE-2017-1000163

GHSA ID

GHSA-cmfh-8f8r-fj96

Source code

Dependabot alerts are not supported on some or all of the ecosystems on this advisory.

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