GHSA-2r3v-q9x3-7g46 Link injection in SimpleSAMLphp
Attackers can trick users into visiting malicious sites via unvalidated links in SimpleSAMLphp logout and no-cookie pages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is GHSA-2r3v-q9x3-7g46?
GHSA-2r3v-q9x3-7g46 is a vulnerability in simplesamlphp/simplesamlphp, published on 24 Jan 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Background
Several scripts part of SimpleSAMLphp display a web page with links obtained from the request parameters. This allows us to enhance usability, as the users are presented with links they can follow after completing a certain action, like logging out.
Description
The following scripts were not checking the URLs obtained via the HTTP request before displaying them as the target of links that the user may click on:
www/logout.phpmodules/core/www/no_cookie.php
The issue allowed attackers to display links targeting a malicious website inside a trusted site running SimpleSAMLphp, due to the lack of security checks involving the link_href and retryURL HTTP parameters, respectively. The issue was resolved by including a verification of the URLs received in the request against a white list of websites specified in the trusted.url.domains configuration option.
Affected versions
All SimpleSAMLphp versions prior to 1.14.4.
Impact
A remote attacker could craft a link pointing to a trusted website running SimpleSAMLphp, including a parameter pointing to a malicious website, and try to fool the victim into visiting that website by clicking on a link in the page presented by SimpleSAMLphp.
Resolution
Upgrade to the latest version.
Credit
This security issue was discovered and reported by John Page (hyp3rlinx).
Which versions are affected by GHSA-2r3v-q9x3-7g46?
2 open source packages ship an affected version, including simplesamlphp/simplesamlphp.
| Package | Affected | Fixed in |
|---|---|---|
simplesamlphp/simplesamlphp Packagist | All versions | 1.14.4 |
simplesamlphp/simplesamlphp Packagist | All versions | 1.14.4 |
How do I fix GHSA-2r3v-q9x3-7g46?
Upgrade simplesamlphp/simplesamlphp to 1.14.4 or later.
Is GHSA-2r3v-q9x3-7g46 being exploited?
There is no known exploitation of GHSA-2r3v-q9x3-7g46 in the wild and no public exploit code.