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SS-2015-012: External redirection risk in Security?ReturnURL

Severity:
Moderate (?)
Identifier:
SS-2015-012
Versions Affected:
3.0.13 and below, 3.1.0 to 3.1.13-rc1
Versions Fixed:
3.0.14, 3.1.13
Release Date:
2015-05-28

A vulnerability has been found in the SilverStripe framework where a login url can be potentially redirected to an external site.

For example, the url http://www.my-silverstripe-site.com/Security/login?BackURL=/\attacker-site.com will redirect successful logins to the page http://attacker-site.com. If that website were set up to look identical to the first with "login failed" then the user will likely just enter their user/pass again.

Common Vulnerability Scoring System (CVSS) Information

Credit to Matt Lang for reporting this issue.